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Diffstat (limited to 'gcc-4.2.1-5666.3/gcc/recog.c')
| -rw-r--r-- | gcc-4.2.1-5666.3/gcc/recog.c | 3588 |
1 files changed, 3588 insertions, 0 deletions
diff --git a/gcc-4.2.1-5666.3/gcc/recog.c b/gcc-4.2.1-5666.3/gcc/recog.c new file mode 100644 index 000000000..e41671b13 --- /dev/null +++ b/gcc-4.2.1-5666.3/gcc/recog.c @@ -0,0 +1,3588 @@ +/* Subroutines used by or related to instruction recognition. + Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 + 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 2, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ + + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tm.h" +#include "rtl.h" +#include "tm_p.h" +#include "insn-config.h" +#include "insn-attr.h" +#include "hard-reg-set.h" +#include "recog.h" +#include "regs.h" +#include "addresses.h" +#include "expr.h" +#include "function.h" +#include "flags.h" +#include "real.h" +#include "toplev.h" +#include "basic-block.h" +#include "output.h" +#include "reload.h" +#include "timevar.h" +#include "tree-pass.h" + +#ifndef STACK_PUSH_CODE +#ifdef STACK_GROWS_DOWNWARD +#define STACK_PUSH_CODE PRE_DEC +#else +#define STACK_PUSH_CODE PRE_INC +#endif +#endif + +#ifndef STACK_POP_CODE +#ifdef STACK_GROWS_DOWNWARD +#define STACK_POP_CODE POST_INC +#else +#define STACK_POP_CODE POST_DEC +#endif +#endif + +static void validate_replace_rtx_1 (rtx *, rtx, rtx, rtx); +static rtx *find_single_use_1 (rtx, rtx *); +static void validate_replace_src_1 (rtx *, void *); +static rtx split_insn (rtx); + +/* Nonzero means allow operands to be volatile. + This should be 0 if you are generating rtl, such as if you are calling + the functions in optabs.c and expmed.c (most of the time). + This should be 1 if all valid insns need to be recognized, + such as in regclass.c and final.c and reload.c. + + init_recog and init_recog_no_volatile are responsible for setting this. */ + +int volatile_ok; + +struct recog_data recog_data; + +/* Contains a vector of operand_alternative structures for every operand. + Set up by preprocess_constraints. */ +struct operand_alternative recog_op_alt[MAX_RECOG_OPERANDS][MAX_RECOG_ALTERNATIVES]; + +/* On return from `constrain_operands', indicate which alternative + was satisfied. */ + +int which_alternative; + +/* Nonzero after end of reload pass. + Set to 1 or 0 by toplev.c. + Controls the significance of (SUBREG (MEM)). */ + +int reload_completed; + +/* Nonzero after thread_prologue_and_epilogue_insns has run. */ +int epilogue_completed; + +/* Initialize data used by the function `recog'. + This must be called once in the compilation of a function + before any insn recognition may be done in the function. */ + +void +init_recog_no_volatile (void) +{ + volatile_ok = 0; +} + +void +init_recog (void) +{ + volatile_ok = 1; +} + + +/* Check that X is an insn-body for an `asm' with operands + and that the operands mentioned in it are legitimate. */ + +int +check_asm_operands (rtx x) +{ + int noperands; + rtx *operands; + const char **constraints; + int i; + + /* Post-reload, be more strict with things. */ + if (reload_completed) + { + /* ??? Doh! We've not got the wrapping insn. Cook one up. */ + extract_insn (make_insn_raw (x)); + constrain_operands (1); + return which_alternative >= 0; + } + + noperands = asm_noperands (x); + if (noperands < 0) + return 0; + if (noperands == 0) + return 1; + + operands = alloca (noperands * sizeof (rtx)); + constraints = alloca (noperands * sizeof (char *)); + + decode_asm_operands (x, operands, NULL, constraints, NULL); + + for (i = 0; i < noperands; i++) + { + const char *c = constraints[i]; + if (c[0] == '%') + c++; + if (ISDIGIT ((unsigned char) c[0]) && c[1] == '\0') + c = constraints[c[0] - '0']; + + if (! asm_operand_ok (operands[i], c)) + return 0; + } + + return 1; +} + +/* Static data for the next two routines. */ + +typedef struct change_t +{ + rtx object; + int old_code; + rtx *loc; + rtx old; +} change_t; + +static change_t *changes; +static int changes_allocated; + +static int num_changes = 0; + +/* Validate a proposed change to OBJECT. LOC is the location in the rtl + at which NEW will be placed. If OBJECT is zero, no validation is done, + the change is simply made. + + Two types of objects are supported: If OBJECT is a MEM, memory_address_p + will be called with the address and mode as parameters. If OBJECT is + an INSN, CALL_INSN, or JUMP_INSN, the insn will be re-recognized with + the change in place. + + IN_GROUP is nonzero if this is part of a group of changes that must be + performed as a group. In that case, the changes will be stored. The + function `apply_change_group' will validate and apply the changes. + + If IN_GROUP is zero, this is a single change. Try to recognize the insn + or validate the memory reference with the change applied. If the result + is not valid for the machine, suppress the change and return zero. + Otherwise, perform the change and return 1. */ + +int +validate_change (rtx object, rtx *loc, rtx new, int in_group) +{ + rtx old = *loc; + + if (old == new || rtx_equal_p (old, new)) + return 1; + + gcc_assert (in_group != 0 || num_changes == 0); + + *loc = new; + + /* Save the information describing this change. */ + if (num_changes >= changes_allocated) + { + if (changes_allocated == 0) + /* This value allows for repeated substitutions inside complex + indexed addresses, or changes in up to 5 insns. */ + changes_allocated = MAX_RECOG_OPERANDS * 5; + else + changes_allocated *= 2; + + changes = xrealloc (changes, sizeof (change_t) * changes_allocated); + } + + changes[num_changes].object = object; + changes[num_changes].loc = loc; + changes[num_changes].old = old; + + if (object && !MEM_P (object)) + { + /* Set INSN_CODE to force rerecognition of insn. Save old code in + case invalid. */ + changes[num_changes].old_code = INSN_CODE (object); + INSN_CODE (object) = -1; + } + + num_changes++; + + /* If we are making a group of changes, return 1. Otherwise, validate the + change group we made. */ + + if (in_group) + return 1; + else + return apply_change_group (); +} + + +/* This subroutine of apply_change_group verifies whether the changes to INSN + were valid; i.e. whether INSN can still be recognized. */ + +int +insn_invalid_p (rtx insn) +{ + rtx pat = PATTERN (insn); + int num_clobbers = 0; + /* If we are before reload and the pattern is a SET, see if we can add + clobbers. */ + int icode = recog (pat, insn, + (GET_CODE (pat) == SET + && ! reload_completed && ! reload_in_progress) + ? &num_clobbers : 0); + int is_asm = icode < 0 && asm_noperands (PATTERN (insn)) >= 0; + + + /* If this is an asm and the operand aren't legal, then fail. Likewise if + this is not an asm and the insn wasn't recognized. */ + if ((is_asm && ! check_asm_operands (PATTERN (insn))) + || (!is_asm && icode < 0)) + return 1; + + /* If we have to add CLOBBERs, fail if we have to add ones that reference + hard registers since our callers can't know if they are live or not. + Otherwise, add them. */ + if (num_clobbers > 0) + { + rtx newpat; + + if (added_clobbers_hard_reg_p (icode)) + return 1; + + newpat = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (num_clobbers + 1)); + XVECEXP (newpat, 0, 0) = pat; + add_clobbers (newpat, icode); + PATTERN (insn) = pat = newpat; + } + + /* After reload, verify that all constraints are satisfied. */ + if (reload_completed) + { + extract_insn (insn); + + if (! constrain_operands (1)) + return 1; + } + + INSN_CODE (insn) = icode; + return 0; +} + +/* Return number of changes made and not validated yet. */ +int +num_changes_pending (void) +{ + return num_changes; +} + +/* Tentatively apply the changes numbered NUM and up. + Return 1 if all changes are valid, zero otherwise. */ + +int +verify_changes (int num) +{ + int i; + rtx last_validated = NULL_RTX; + + /* The changes have been applied and all INSN_CODEs have been reset to force + rerecognition. + + The changes are valid if we aren't given an object, or if we are + given a MEM and it still is a valid address, or if this is in insn + and it is recognized. In the latter case, if reload has completed, + we also require that the operands meet the constraints for + the insn. */ + + for (i = num; i < num_changes; i++) + { + rtx object = changes[i].object; + + /* If there is no object to test or if it is the same as the one we + already tested, ignore it. */ + if (object == 0 || object == last_validated) + continue; + + if (MEM_P (object)) + { + if (! memory_address_p (GET_MODE (object), XEXP (object, 0))) + break; + } + else if (insn_invalid_p (object)) + { + rtx pat = PATTERN (object); + + /* Perhaps we couldn't recognize the insn because there were + extra CLOBBERs at the end. If so, try to re-recognize + without the last CLOBBER (later iterations will cause each of + them to be eliminated, in turn). But don't do this if we + have an ASM_OPERAND. */ + if (GET_CODE (pat) == PARALLEL + && GET_CODE (XVECEXP (pat, 0, XVECLEN (pat, 0) - 1)) == CLOBBER + && asm_noperands (PATTERN (object)) < 0) + { + rtx newpat; + + if (XVECLEN (pat, 0) == 2) + newpat = XVECEXP (pat, 0, 0); + else + { + int j; + + newpat + = gen_rtx_PARALLEL (VOIDmode, + rtvec_alloc (XVECLEN (pat, 0) - 1)); + for (j = 0; j < XVECLEN (newpat, 0); j++) + XVECEXP (newpat, 0, j) = XVECEXP (pat, 0, j); + } + + /* Add a new change to this group to replace the pattern + with this new pattern. Then consider this change + as having succeeded. The change we added will + cause the entire call to fail if things remain invalid. + + Note that this can lose if a later change than the one + we are processing specified &XVECEXP (PATTERN (object), 0, X) + but this shouldn't occur. */ + + validate_change (object, &PATTERN (object), newpat, 1); + continue; + } + else if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER) + /* If this insn is a CLOBBER or USE, it is always valid, but is + never recognized. */ + continue; + else + break; + } + last_validated = object; + } + + return (i == num_changes); +} + +/* A group of changes has previously been issued with validate_change and + verified with verify_changes. Update the BB_DIRTY flags of the affected + blocks, and clear num_changes. */ + +void +confirm_change_group (void) +{ + int i; + basic_block bb; + + for (i = 0; i < num_changes; i++) + if (changes[i].object + && INSN_P (changes[i].object) + && (bb = BLOCK_FOR_INSN (changes[i].object))) + bb->flags |= BB_DIRTY; + + num_changes = 0; +} + +/* Apply a group of changes previously issued with `validate_change'. + If all changes are valid, call confirm_change_group and return 1, + otherwise, call cancel_changes and return 0. */ + +int +apply_change_group (void) +{ + if (verify_changes (0)) + { + confirm_change_group (); + return 1; + } + else + { + cancel_changes (0); + return 0; + } +} + + +/* Return the number of changes so far in the current group. */ + +int +num_validated_changes (void) +{ + return num_changes; +} + +/* Retract the changes numbered NUM and up. */ + +void +cancel_changes (int num) +{ + int i; + + /* Back out all the changes. Do this in the opposite order in which + they were made. */ + for (i = num_changes - 1; i >= num; i--) + { + *changes[i].loc = changes[i].old; + if (changes[i].object && !MEM_P (changes[i].object)) + INSN_CODE (changes[i].object) = changes[i].old_code; + } + num_changes = num; +} + +/* Replace every occurrence of FROM in X with TO. Mark each change with + validate_change passing OBJECT. */ + +static void +validate_replace_rtx_1 (rtx *loc, rtx from, rtx to, rtx object) +{ + int i, j; + const char *fmt; + rtx x = *loc; + enum rtx_code code; + enum machine_mode op0_mode = VOIDmode; + int prev_changes = num_changes; + rtx new; + + if (!x) + return; + + code = GET_CODE (x); + fmt = GET_RTX_FORMAT (code); + if (fmt[0] == 'e') + op0_mode = GET_MODE (XEXP (x, 0)); + + /* X matches FROM if it is the same rtx or they are both referring to the + same register in the same mode. Avoid calling rtx_equal_p unless the + operands look similar. */ + + if (x == from + || (REG_P (x) && REG_P (from) + && GET_MODE (x) == GET_MODE (from) + && REGNO (x) == REGNO (from)) + || (GET_CODE (x) == GET_CODE (from) && GET_MODE (x) == GET_MODE (from) + && rtx_equal_p (x, from))) + { + validate_change (object, loc, to, 1); + return; + } + + /* Call ourself recursively to perform the replacements. + We must not replace inside already replaced expression, otherwise we + get infinite recursion for replacements like (reg X)->(subreg (reg X)) + done by regmove, so we must special case shared ASM_OPERANDS. */ + + if (GET_CODE (x) == PARALLEL) + { + for (j = XVECLEN (x, 0) - 1; j >= 0; j--) + { + if (j && GET_CODE (XVECEXP (x, 0, j)) == SET + && GET_CODE (SET_SRC (XVECEXP (x, 0, j))) == ASM_OPERANDS) + { + /* Verify that operands are really shared. */ + gcc_assert (ASM_OPERANDS_INPUT_VEC (SET_SRC (XVECEXP (x, 0, 0))) + == ASM_OPERANDS_INPUT_VEC (SET_SRC (XVECEXP + (x, 0, j)))); + validate_replace_rtx_1 (&SET_DEST (XVECEXP (x, 0, j)), + from, to, object); + } + else + validate_replace_rtx_1 (&XVECEXP (x, 0, j), from, to, object); + } + } + else + for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) + { + if (fmt[i] == 'e') + validate_replace_rtx_1 (&XEXP (x, i), from, to, object); + else if (fmt[i] == 'E') + for (j = XVECLEN (x, i) - 1; j >= 0; j--) + validate_replace_rtx_1 (&XVECEXP (x, i, j), from, to, object); + } + + /* If we didn't substitute, there is nothing more to do. */ + if (num_changes == prev_changes) + return; + + /* Allow substituted expression to have different mode. This is used by + regmove to change mode of pseudo register. */ + if (fmt[0] == 'e' && GET_MODE (XEXP (x, 0)) != VOIDmode) + op0_mode = GET_MODE (XEXP (x, 0)); + + /* Do changes needed to keep rtx consistent. Don't do any other + simplifications, as it is not our job. */ + + if (SWAPPABLE_OPERANDS_P (x) + && swap_commutative_operands_p (XEXP (x, 0), XEXP (x, 1))) + { + validate_change (object, loc, + gen_rtx_fmt_ee (COMMUTATIVE_ARITH_P (x) ? code + : swap_condition (code), + GET_MODE (x), XEXP (x, 1), + XEXP (x, 0)), 1); + x = *loc; + code = GET_CODE (x); + } + + switch (code) + { + case PLUS: + /* If we have a PLUS whose second operand is now a CONST_INT, use + simplify_gen_binary to try to simplify it. + ??? We may want later to remove this, once simplification is + separated from this function. */ + if (GET_CODE (XEXP (x, 1)) == CONST_INT && XEXP (x, 1) == to) + validate_change (object, loc, + simplify_gen_binary + (PLUS, GET_MODE (x), XEXP (x, 0), XEXP (x, 1)), 1); + break; + case MINUS: + if (GET_CODE (XEXP (x, 1)) == CONST_INT + || GET_CODE (XEXP (x, 1)) == CONST_DOUBLE) + validate_change (object, loc, + simplify_gen_binary + (PLUS, GET_MODE (x), XEXP (x, 0), + simplify_gen_unary (NEG, + GET_MODE (x), XEXP (x, 1), + GET_MODE (x))), 1); + break; + case ZERO_EXTEND: + case SIGN_EXTEND: + if (GET_MODE (XEXP (x, 0)) == VOIDmode) + { + new = simplify_gen_unary (code, GET_MODE (x), XEXP (x, 0), + op0_mode); + /* If any of the above failed, substitute in something that + we know won't be recognized. */ + if (!new) + new = gen_rtx_CLOBBER (GET_MODE (x), const0_rtx); + validate_change (object, loc, new, 1); + } + break; + case SUBREG: + /* All subregs possible to simplify should be simplified. */ + new = simplify_subreg (GET_MODE (x), SUBREG_REG (x), op0_mode, + SUBREG_BYTE (x)); + + /* Subregs of VOIDmode operands are incorrect. */ + if (!new && GET_MODE (SUBREG_REG (x)) == VOIDmode) + new = gen_rtx_CLOBBER (GET_MODE (x), const0_rtx); + if (new) + validate_change (object, loc, new, 1); + break; + case ZERO_EXTRACT: + case SIGN_EXTRACT: + /* If we are replacing a register with memory, try to change the memory + to be the mode required for memory in extract operations (this isn't + likely to be an insertion operation; if it was, nothing bad will + happen, we might just fail in some cases). */ + + if (MEM_P (XEXP (x, 0)) + && GET_CODE (XEXP (x, 1)) == CONST_INT + && GET_CODE (XEXP (x, 2)) == CONST_INT + && !mode_dependent_address_p (XEXP (XEXP (x, 0), 0)) + && !MEM_VOLATILE_P (XEXP (x, 0))) + { + enum machine_mode wanted_mode = VOIDmode; + enum machine_mode is_mode = GET_MODE (XEXP (x, 0)); + int pos = INTVAL (XEXP (x, 2)); + + if (GET_CODE (x) == ZERO_EXTRACT) + { + enum machine_mode new_mode + = mode_for_extraction (EP_extzv, 1); + if (new_mode != MAX_MACHINE_MODE) + wanted_mode = new_mode; + } + else if (GET_CODE (x) == SIGN_EXTRACT) + { + enum machine_mode new_mode + = mode_for_extraction (EP_extv, 1); + if (new_mode != MAX_MACHINE_MODE) + wanted_mode = new_mode; + } + + /* If we have a narrower mode, we can do something. */ + if (wanted_mode != VOIDmode + && GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) + { + int offset = pos / BITS_PER_UNIT; + rtx newmem; + + /* If the bytes and bits are counted differently, we + must adjust the offset. */ + if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) + offset = + (GET_MODE_SIZE (is_mode) - GET_MODE_SIZE (wanted_mode) - + offset); + + pos %= GET_MODE_BITSIZE (wanted_mode); + + newmem = adjust_address_nv (XEXP (x, 0), wanted_mode, offset); + + validate_change (object, &XEXP (x, 2), GEN_INT (pos), 1); + validate_change (object, &XEXP (x, 0), newmem, 1); + } + } + + break; + + default: + break; + } +} + +/* Try replacing every occurrence of FROM in INSN with TO. After all + changes have been made, validate by seeing if INSN is still valid. */ + +int +validate_replace_rtx (rtx from, rtx to, rtx insn) +{ + validate_replace_rtx_1 (&PATTERN (insn), from, to, insn); + return apply_change_group (); +} + +/* Try replacing every occurrence of FROM in INSN with TO. */ + +void +validate_replace_rtx_group (rtx from, rtx to, rtx insn) +{ + validate_replace_rtx_1 (&PATTERN (insn), from, to, insn); +} + +/* Function called by note_uses to replace used subexpressions. */ +struct validate_replace_src_data +{ + rtx from; /* Old RTX */ + rtx to; /* New RTX */ + rtx insn; /* Insn in which substitution is occurring. */ +}; + +static void +validate_replace_src_1 (rtx *x, void *data) +{ + struct validate_replace_src_data *d + = (struct validate_replace_src_data *) data; + + validate_replace_rtx_1 (x, d->from, d->to, d->insn); +} + +/* Try replacing every occurrence of FROM in INSN with TO, avoiding + SET_DESTs. */ + +void +validate_replace_src_group (rtx from, rtx to, rtx insn) +{ + struct validate_replace_src_data d; + + d.from = from; + d.to = to; + d.insn = insn; + note_uses (&PATTERN (insn), validate_replace_src_1, &d); +} + +/* Try simplify INSN. + Invoke simplify_rtx () on every SET_SRC and SET_DEST inside the INSN's + pattern and return true if something was simplified. */ + +bool +validate_simplify_insn (rtx insn) +{ + int i; + rtx pat = NULL; + rtx newpat = NULL; + + pat = PATTERN (insn); + + if (GET_CODE (pat) == SET) + { + newpat = simplify_rtx (SET_SRC (pat)); + if (newpat && !rtx_equal_p (SET_SRC (pat), newpat)) + validate_change (insn, &SET_SRC (pat), newpat, 1); + newpat = simplify_rtx (SET_DEST (pat)); + if (newpat && !rtx_equal_p (SET_DEST (pat), newpat)) + validate_change (insn, &SET_DEST (pat), newpat, 1); + } + else if (GET_CODE (pat) == PARALLEL) + for (i = 0; i < XVECLEN (pat, 0); i++) + { + rtx s = XVECEXP (pat, 0, i); + + if (GET_CODE (XVECEXP (pat, 0, i)) == SET) + { + newpat = simplify_rtx (SET_SRC (s)); + if (newpat && !rtx_equal_p (SET_SRC (s), newpat)) + validate_change (insn, &SET_SRC (s), newpat, 1); + newpat = simplify_rtx (SET_DEST (s)); + if (newpat && !rtx_equal_p (SET_DEST (s), newpat)) + validate_change (insn, &SET_DEST (s), newpat, 1); + } + } + return ((num_changes_pending () > 0) && (apply_change_group () > 0)); +} + +#ifdef HAVE_cc0 +/* Return 1 if the insn using CC0 set by INSN does not contain + any ordered tests applied to the condition codes. + EQ and NE tests do not count. */ + +int +next_insn_tests_no_inequality (rtx insn) +{ + rtx next = next_cc0_user (insn); + + /* If there is no next insn, we have to take the conservative choice. */ + if (next == 0) + return 0; + + return (INSN_P (next) + && ! inequality_comparisons_p (PATTERN (next))); +} +#endif + +/* This is used by find_single_use to locate an rtx that contains exactly one + use of DEST, which is typically either a REG or CC0. It returns a + pointer to the innermost rtx expression containing DEST. Appearances of + DEST that are being used to totally replace it are not counted. */ + +static rtx * +find_single_use_1 (rtx dest, rtx *loc) +{ + rtx x = *loc; + enum rtx_code code = GET_CODE (x); + rtx *result = 0; + rtx *this_result; + int i; + const char *fmt; + + switch (code) + { + case CONST_INT: + case CONST: + case LABEL_REF: + case SYMBOL_REF: + case CONST_DOUBLE: + case CONST_VECTOR: + case CLOBBER: + return 0; + + case SET: + /* If the destination is anything other than CC0, PC, a REG or a SUBREG + of a REG that occupies all of the REG, the insn uses DEST if + it is mentioned in the destination or the source. Otherwise, we + need just check the source. */ + if (GET_CODE (SET_DEST (x)) != CC0 + && GET_CODE (SET_DEST (x)) != PC + && !REG_P (SET_DEST (x)) + && ! (GET_CODE (SET_DEST (x)) == SUBREG + && REG_P (SUBREG_REG (SET_DEST (x))) + && (((GET_MODE_SIZE (GET_MODE (SUBREG_REG (SET_DEST (x)))) + + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) + == ((GET_MODE_SIZE (GET_MODE (SET_DEST (x))) + + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)))) + break; + + return find_single_use_1 (dest, &SET_SRC (x)); + + case MEM: + case SUBREG: + return find_single_use_1 (dest, &XEXP (x, 0)); + + default: + break; + } + + /* If it wasn't one of the common cases above, check each expression and + vector of this code. Look for a unique usage of DEST. */ + + fmt = GET_RTX_FORMAT (code); + for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) + { + if (fmt[i] == 'e') + { + if (dest == XEXP (x, i) + || (REG_P (dest) && REG_P (XEXP (x, i)) + && REGNO (dest) == REGNO (XEXP (x, i)))) + this_result = loc; + else + this_result = find_single_use_1 (dest, &XEXP (x, i)); + + if (result == 0) + result = this_result; + else if (this_result) + /* Duplicate usage. */ + return 0; + } + else if (fmt[i] == 'E') + { + int j; + + for (j = XVECLEN (x, i) - 1; j >= 0; j--) + { + if (XVECEXP (x, i, j) == dest + || (REG_P (dest) + && REG_P (XVECEXP (x, i, j)) + && REGNO (XVECEXP (x, i, j)) == REGNO (dest))) + this_result = loc; + else + this_result = find_single_use_1 (dest, &XVECEXP (x, i, j)); + + if (result == 0) + result = this_result; + else if (this_result) + return 0; + } + } + } + + return result; +} + +/* See if DEST, produced in INSN, is used only a single time in the + sequel. If so, return a pointer to the innermost rtx expression in which + it is used. + + If PLOC is nonzero, *PLOC is set to the insn containing the single use. + + This routine will return usually zero either before flow is called (because + there will be no LOG_LINKS notes) or after reload (because the REG_DEAD + note can't be trusted). + + If DEST is cc0_rtx, we look only at the next insn. In that case, we don't + care about REG_DEAD notes or LOG_LINKS. + + Otherwise, we find the single use by finding an insn that has a + LOG_LINKS pointing at INSN and has a REG_DEAD note for DEST. If DEST is + only referenced once in that insn, we know that it must be the first + and last insn referencing DEST. */ + +rtx * +find_single_use (rtx dest, rtx insn, rtx *ploc) +{ + rtx next; + rtx *result; + rtx link; + +#ifdef HAVE_cc0 + if (dest == cc0_rtx) + { + next = NEXT_INSN (insn); + if (next == 0 + || (!NONJUMP_INSN_P (next) && !JUMP_P (next))) + return 0; + + result = find_single_use_1 (dest, &PATTERN (next)); + if (result && ploc) + *ploc = next; + return result; + } +#endif + + if (reload_completed || reload_in_progress || !REG_P (dest)) + return 0; + + for (next = next_nonnote_insn (insn); + next != 0 && !LABEL_P (next); + next = next_nonnote_insn (next)) + if (INSN_P (next) && dead_or_set_p (next, dest)) + { + for (link = LOG_LINKS (next); link; link = XEXP (link, 1)) + if (XEXP (link, 0) == insn) + break; + + if (link) + { + result = find_single_use_1 (dest, &PATTERN (next)); + if (ploc) + *ploc = next; + return result; + } + } + + return 0; +} + +/* Return 1 if OP is a valid general operand for machine mode MODE. + This is either a register reference, a memory reference, + or a constant. In the case of a memory reference, the address + is checked for general validity for the target machine. + + Register and memory references must have mode MODE in order to be valid, + but some constants have no machine mode and are valid for any mode. + + If MODE is VOIDmode, OP is checked for validity for whatever mode + it has. + + The main use of this function is as a predicate in match_operand + expressions in the machine description. + + For an explanation of this function's behavior for registers of + class NO_REGS, see the comment for `register_operand'. */ + +int +general_operand (rtx op, enum machine_mode mode) +{ + enum rtx_code code = GET_CODE (op); + + if (mode == VOIDmode) + mode = GET_MODE (op); + + /* Don't accept CONST_INT or anything similar + if the caller wants something floating. */ + if (GET_MODE (op) == VOIDmode && mode != VOIDmode + && GET_MODE_CLASS (mode) != MODE_INT + && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) + return 0; + + if (GET_CODE (op) == CONST_INT + && mode != VOIDmode + && trunc_int_for_mode (INTVAL (op), mode) != INTVAL (op)) + return 0; + + if (CONSTANT_P (op)) + return ((GET_MODE (op) == VOIDmode || GET_MODE (op) == mode + || mode == VOIDmode) + /* APPLE LOCAL ARM -mdynamic-no-pic support */ + && LEGITIMATE_INDIRECT_OPERAND_P (op) + && LEGITIMATE_CONSTANT_P (op)); + + /* Except for certain constants with VOIDmode, already checked for, + OP's mode must match MODE if MODE specifies a mode. */ + + if (GET_MODE (op) != mode) + return 0; + + if (code == SUBREG) + { + rtx sub = SUBREG_REG (op); + +#ifdef INSN_SCHEDULING + /* On machines that have insn scheduling, we want all memory + reference to be explicit, so outlaw paradoxical SUBREGs. + However, we must allow them after reload so that they can + get cleaned up by cleanup_subreg_operands. */ + if (!reload_completed && MEM_P (sub) + && GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (sub))) + return 0; +#endif + /* Avoid memories with nonzero SUBREG_BYTE, as offsetting the memory + may result in incorrect reference. We should simplify all valid + subregs of MEM anyway. But allow this after reload because we + might be called from cleanup_subreg_operands. + + ??? This is a kludge. */ + if (!reload_completed && SUBREG_BYTE (op) != 0 + && MEM_P (sub)) + return 0; + + /* FLOAT_MODE subregs can't be paradoxical. Combine will occasionally + create such rtl, and we must reject it. */ + if (SCALAR_FLOAT_MODE_P (GET_MODE (op)) + && GET_MODE_SIZE (GET_MODE (op)) > GET_MODE_SIZE (GET_MODE (sub))) + return 0; + + op = sub; + code = GET_CODE (op); + } + + if (code == REG) + /* A register whose class is NO_REGS is not a general operand. */ + return (REGNO (op) >= FIRST_PSEUDO_REGISTER + || REGNO_REG_CLASS (REGNO (op)) != NO_REGS); + + if (code == MEM) + { + rtx y = XEXP (op, 0); + + if (! volatile_ok && MEM_VOLATILE_P (op)) + return 0; + + /* Use the mem's mode, since it will be reloaded thus. */ + if (memory_address_p (GET_MODE (op), y)) + return 1; + } + + return 0; +} + +/* Return 1 if OP is a valid memory address for a memory reference + of mode MODE. + + The main use of this function is as a predicate in match_operand + expressions in the machine description. */ + +int +address_operand (rtx op, enum machine_mode mode) +{ + return memory_address_p (mode, op); +} + +/* Return 1 if OP is a register reference of mode MODE. + If MODE is VOIDmode, accept a register in any mode. + + The main use of this function is as a predicate in match_operand + expressions in the machine description. + + As a special exception, registers whose class is NO_REGS are + not accepted by `register_operand'. The reason for this change + is to allow the representation of special architecture artifacts + (such as a condition code register) without extending the rtl + definitions. Since registers of class NO_REGS cannot be used + as registers in any case where register classes are examined, + it is most consistent to keep this function from accepting them. */ + +int +register_operand (rtx op, enum machine_mode mode) +{ + if (GET_MODE (op) != mode && mode != VOIDmode) + return 0; + + if (GET_CODE (op) == SUBREG) + { + rtx sub = SUBREG_REG (op); + + /* Before reload, we can allow (SUBREG (MEM...)) as a register operand + because it is guaranteed to be reloaded into one. + Just make sure the MEM is valid in itself. + (Ideally, (SUBREG (MEM)...) should not exist after reload, + but currently it does result from (SUBREG (REG)...) where the + reg went on the stack.) */ + if (! reload_completed && MEM_P (sub)) + return general_operand (op, mode); + +#ifdef CANNOT_CHANGE_MODE_CLASS + if (REG_P (sub) + && REGNO (sub) < FIRST_PSEUDO_REGISTER + && REG_CANNOT_CHANGE_MODE_P (REGNO (sub), GET_MODE (sub), mode) + && GET_MODE_CLASS (GET_MODE (sub)) != MODE_COMPLEX_INT + && GET_MODE_CLASS (GET_MODE (sub)) != MODE_COMPLEX_FLOAT) + return 0; +#endif + + /* FLOAT_MODE subregs can't be paradoxical. Combine will occasionally + create such rtl, and we must reject it. */ + if (SCALAR_FLOAT_MODE_P (GET_MODE (op)) + && GET_MODE_SIZE (GET_MODE (op)) > GET_MODE_SIZE (GET_MODE (sub))) + return 0; + + op = sub; + } + + /* We don't consider registers whose class is NO_REGS + to be a register operand. */ + return (REG_P (op) + && (REGNO (op) >= FIRST_PSEUDO_REGISTER + || REGNO_REG_CLASS (REGNO (op)) != NO_REGS)); +} + +/* Return 1 for a register in Pmode; ignore the tested mode. */ + +int +pmode_register_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) +{ + return register_operand (op, Pmode); +} + +/* Return 1 if OP should match a MATCH_SCRATCH, i.e., if it is a SCRATCH + or a hard register. */ + +int +scratch_operand (rtx op, enum machine_mode mode) +{ + if (GET_MODE (op) != mode && mode != VOIDmode) + return 0; + + return (GET_CODE (op) == SCRATCH + || (REG_P (op) + && REGNO (op) < FIRST_PSEUDO_REGISTER)); +} + +/* Return 1 if OP is a valid immediate operand for mode MODE. + + The main use of this function is as a predicate in match_operand + expressions in the machine description. */ + +int +immediate_operand (rtx op, enum machine_mode mode) +{ + /* Don't accept CONST_INT or anything similar + if the caller wants something floating. */ + if (GET_MODE (op) == VOIDmode && mode != VOIDmode + && GET_MODE_CLASS (mode) != MODE_INT + && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) + return 0; + + if (GET_CODE (op) == CONST_INT + && mode != VOIDmode + && trunc_int_for_mode (INTVAL (op), mode) != INTVAL (op)) + return 0; + + return (CONSTANT_P (op) + && (GET_MODE (op) == mode || mode == VOIDmode + || GET_MODE (op) == VOIDmode) + /* APPLE LOCAL ARM -mdynamic-no-pic support */ + && LEGITIMATE_INDIRECT_OPERAND_P (op) + && LEGITIMATE_CONSTANT_P (op)); +} + +/* Returns 1 if OP is an operand that is a CONST_INT. */ + +int +const_int_operand (rtx op, enum machine_mode mode) +{ + if (GET_CODE (op) != CONST_INT) + return 0; + + if (mode != VOIDmode + && trunc_int_for_mode (INTVAL (op), mode) != INTVAL (op)) + return 0; + + return 1; +} + +/* Returns 1 if OP is an operand that is a constant integer or constant + floating-point number. */ + +int +const_double_operand (rtx op, enum machine_mode mode) +{ + /* Don't accept CONST_INT or anything similar + if the caller wants something floating. */ + if (GET_MODE (op) == VOIDmode && mode != VOIDmode + && GET_MODE_CLASS (mode) != MODE_INT + && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) + return 0; + + return ((GET_CODE (op) == CONST_DOUBLE || GET_CODE (op) == CONST_INT) + && (mode == VOIDmode || GET_MODE (op) == mode + || GET_MODE (op) == VOIDmode)); +} + +/* Return 1 if OP is a general operand that is not an immediate operand. */ + +int +nonimmediate_operand (rtx op, enum machine_mode mode) +{ + return (general_operand (op, mode) && ! CONSTANT_P (op)); +} + +/* Return 1 if OP is a register reference or immediate value of mode MODE. */ + +int +nonmemory_operand (rtx op, enum machine_mode mode) +{ + if (CONSTANT_P (op)) + { + /* Don't accept CONST_INT or anything similar + if the caller wants something floating. */ + if (GET_MODE (op) == VOIDmode && mode != VOIDmode + && GET_MODE_CLASS (mode) != MODE_INT + && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) + return 0; + + if (GET_CODE (op) == CONST_INT + && mode != VOIDmode + && trunc_int_for_mode (INTVAL (op), mode) != INTVAL (op)) + return 0; + + return ((GET_MODE (op) == VOIDmode || GET_MODE (op) == mode + || mode == VOIDmode) + /* APPLE LOCAL ARM -mdynamic-no-pic support */ + && LEGITIMATE_INDIRECT_OPERAND_P (op) + && LEGITIMATE_CONSTANT_P (op)); + } + + if (GET_MODE (op) != mode && mode != VOIDmode) + return 0; + + if (GET_CODE (op) == SUBREG) + { + /* Before reload, we can allow (SUBREG (MEM...)) as a register operand + because it is guaranteed to be reloaded into one. + Just make sure the MEM is valid in itself. + (Ideally, (SUBREG (MEM)...) should not exist after reload, + but currently it does result from (SUBREG (REG)...) where the + reg went on the stack.) */ + if (! reload_completed && MEM_P (SUBREG_REG (op))) + return general_operand (op, mode); + op = SUBREG_REG (op); + } + + /* We don't consider registers whose class is NO_REGS + to be a register operand. */ + return (REG_P (op) + && (REGNO (op) >= FIRST_PSEUDO_REGISTER + || REGNO_REG_CLASS (REGNO (op)) != NO_REGS)); +} + +/* Return 1 if OP is a valid operand that stands for pushing a + value of mode MODE onto the stack. + + The main use of this function is as a predicate in match_operand + expressions in the machine description. */ + +int +push_operand (rtx op, enum machine_mode mode) +{ + unsigned int rounded_size = GET_MODE_SIZE (mode); + +#ifdef PUSH_ROUNDING + rounded_size = PUSH_ROUNDING (rounded_size); +#endif + + if (!MEM_P (op)) + return 0; + + if (mode != VOIDmode && GET_MODE (op) != mode) + return 0; + + op = XEXP (op, 0); + + if (rounded_size == GET_MODE_SIZE (mode)) + { + if (GET_CODE (op) != STACK_PUSH_CODE) + return 0; + } + else + { + if (GET_CODE (op) != PRE_MODIFY + || GET_CODE (XEXP (op, 1)) != PLUS + || XEXP (XEXP (op, 1), 0) != XEXP (op, 0) + || GET_CODE (XEXP (XEXP (op, 1), 1)) != CONST_INT +#ifdef STACK_GROWS_DOWNWARD + || INTVAL (XEXP (XEXP (op, 1), 1)) != - (int) rounded_size +#else + || INTVAL (XEXP (XEXP (op, 1), 1)) != (int) rounded_size +#endif + ) + return 0; + } + + return XEXP (op, 0) == stack_pointer_rtx; +} + +/* Return 1 if OP is a valid operand that stands for popping a + value of mode MODE off the stack. + + The main use of this function is as a predicate in match_operand + expressions in the machine description. */ + +int +pop_operand (rtx op, enum machine_mode mode) +{ + if (!MEM_P (op)) + return 0; + + if (mode != VOIDmode && GET_MODE (op) != mode) + return 0; + + op = XEXP (op, 0); + + if (GET_CODE (op) != STACK_POP_CODE) + return 0; + + return XEXP (op, 0) == stack_pointer_rtx; +} + +/* Return 1 if ADDR is a valid memory address for mode MODE. */ + +int +memory_address_p (enum machine_mode mode ATTRIBUTE_UNUSED, rtx addr) +{ + GO_IF_LEGITIMATE_ADDRESS (mode, addr, win); + return 0; + + win: + return 1; +} + +/* Return 1 if OP is a valid memory reference with mode MODE, + including a valid address. + + The main use of this function is as a predicate in match_operand + expressions in the machine description. */ + +int +memory_operand (rtx op, enum machine_mode mode) +{ + rtx inner; + + if (! reload_completed) + /* Note that no SUBREG is a memory operand before end of reload pass, + because (SUBREG (MEM...)) forces reloading into a register. */ + return MEM_P (op) && general_operand (op, mode); + + if (mode != VOIDmode && GET_MODE (op) != mode) + return 0; + + inner = op; + if (GET_CODE (inner) == SUBREG) + inner = SUBREG_REG (inner); + + return (MEM_P (inner) && general_operand (op, mode)); +} + +/* Return 1 if OP is a valid indirect memory reference with mode MODE; + that is, a memory reference whose address is a general_operand. */ + +int +indirect_operand (rtx op, enum machine_mode mode) +{ + /* Before reload, a SUBREG isn't in memory (see memory_operand, above). */ + if (! reload_completed + && GET_CODE (op) == SUBREG && MEM_P (SUBREG_REG (op))) + { + int offset = SUBREG_BYTE (op); + rtx inner = SUBREG_REG (op); + + if (mode != VOIDmode && GET_MODE (op) != mode) + return 0; + + /* The only way that we can have a general_operand as the resulting + address is if OFFSET is zero and the address already is an operand + or if the address is (plus Y (const_int -OFFSET)) and Y is an + operand. */ + + return ((offset == 0 && general_operand (XEXP (inner, 0), Pmode)) + || (GET_CODE (XEXP (inner, 0)) == PLUS + && GET_CODE (XEXP (XEXP (inner, 0), 1)) == CONST_INT + && INTVAL (XEXP (XEXP (inner, 0), 1)) == -offset + && general_operand (XEXP (XEXP (inner, 0), 0), Pmode))); + } + + return (MEM_P (op) + && memory_operand (op, mode) + && general_operand (XEXP (op, 0), Pmode)); +} + +/* Return 1 if this is a comparison operator. This allows the use of + MATCH_OPERATOR to recognize all the branch insns. */ + +int +comparison_operator (rtx op, enum machine_mode mode) +{ + return ((mode == VOIDmode || GET_MODE (op) == mode) + && COMPARISON_P (op)); +} + +/* If BODY is an insn body that uses ASM_OPERANDS, + return the number of operands (both input and output) in the insn. + Otherwise return -1. */ + +int +asm_noperands (rtx body) +{ + switch (GET_CODE (body)) + { + case ASM_OPERANDS: + /* No output operands: return number of input operands. */ + return ASM_OPERANDS_INPUT_LENGTH (body); + case SET: + if (GET_CODE (SET_SRC (body)) == ASM_OPERANDS) + /* Single output operand: BODY is (set OUTPUT (asm_operands ...)). */ + return ASM_OPERANDS_INPUT_LENGTH (SET_SRC (body)) + 1; + else + return -1; + case PARALLEL: + if (GET_CODE (XVECEXP (body, 0, 0)) == SET + && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) == ASM_OPERANDS) + { + /* Multiple output operands, or 1 output plus some clobbers: + body is [(set OUTPUT (asm_operands ...))... (clobber (reg ...))...]. */ + int i; + int n_sets; + + /* APPLE LOCAL CW asm blocks */ + /* Count backwards through CLOBBERs/USEs to determine number of SETs. */ + for (i = XVECLEN (body, 0); i > 0; i--) + { + if (GET_CODE (XVECEXP (body, 0, i - 1)) == SET) + break; + /* APPLE LOCAL begin CW asm blocks */ + if (GET_CODE (XVECEXP (body, 0, i - 1)) != CLOBBER + && GET_CODE (XVECEXP (body, 0, i - 1)) != USE) + /* APPLE LOCAL end CW asm blocks */ + return -1; + } + + /* N_SETS is now number of output operands. */ + n_sets = i; + + /* Verify that all the SETs we have + came from a single original asm_operands insn + (so that invalid combinations are blocked). */ + for (i = 0; i < n_sets; i++) + { + rtx elt = XVECEXP (body, 0, i); + if (GET_CODE (elt) != SET) + return -1; + if (GET_CODE (SET_SRC (elt)) != ASM_OPERANDS) + return -1; + /* If these ASM_OPERANDS rtx's came from different original insns + then they aren't allowed together. */ + if (ASM_OPERANDS_INPUT_VEC (SET_SRC (elt)) + != ASM_OPERANDS_INPUT_VEC (SET_SRC (XVECEXP (body, 0, 0)))) + return -1; + } + return (ASM_OPERANDS_INPUT_LENGTH (SET_SRC (XVECEXP (body, 0, 0))) + + n_sets); + } + else if (GET_CODE (XVECEXP (body, 0, 0)) == ASM_OPERANDS) + { + /* 0 outputs, but some clobbers: + body is [(asm_operands ...) (clobber (reg ...))...]. */ + int i; + + /* APPLE LOCAL CW asm blocks */ + /* Make sure all the other parallel things really are clobbers or uses. */ + for (i = XVECLEN (body, 0) - 1; i > 0; i--) + /* APPLE LOCAL begin CW asm blocks */ + if (GET_CODE (XVECEXP (body, 0, i)) != CLOBBER + && GET_CODE (XVECEXP (body, 0, i)) != USE) + /* APPLE LOCAL end CW asm blocks */ + return -1; + + return ASM_OPERANDS_INPUT_LENGTH (XVECEXP (body, 0, 0)); + } + else + return -1; + default: + return -1; + } +} + +/* Assuming BODY is an insn body that uses ASM_OPERANDS, + copy its operands (both input and output) into the vector OPERANDS, + the locations of the operands within the insn into the vector OPERAND_LOCS, + and the constraints for the operands into CONSTRAINTS. + Write the modes of the operands into MODES. + Return the assembler-template. + + If MODES, OPERAND_LOCS, CONSTRAINTS or OPERANDS is 0, + we don't store that info. */ + +const char * +decode_asm_operands (rtx body, rtx *operands, rtx **operand_locs, + const char **constraints, enum machine_mode *modes) +{ + int i; + int noperands; + const char *template = 0; + + if (GET_CODE (body) == SET && GET_CODE (SET_SRC (body)) == ASM_OPERANDS) + { + rtx asmop = SET_SRC (body); + /* Single output operand: BODY is (set OUTPUT (asm_operands ....)). */ + + noperands = ASM_OPERANDS_INPUT_LENGTH (asmop) + 1; + + for (i = 1; i < noperands; i++) + { + if (operand_locs) + operand_locs[i] = &ASM_OPERANDS_INPUT (asmop, i - 1); + if (operands) + operands[i] = ASM_OPERANDS_INPUT (asmop, i - 1); + if (constraints) + constraints[i] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i - 1); + if (modes) + modes[i] = ASM_OPERANDS_INPUT_MODE (asmop, i - 1); + } + + /* The output is in the SET. + Its constraint is in the ASM_OPERANDS itself. */ + if (operands) + operands[0] = SET_DEST (body); + if (operand_locs) + operand_locs[0] = &SET_DEST (body); + if (constraints) + constraints[0] = ASM_OPERANDS_OUTPUT_CONSTRAINT (asmop); + if (modes) + modes[0] = GET_MODE (SET_DEST (body)); + template = ASM_OPERANDS_TEMPLATE (asmop); + } + else if (GET_CODE (body) == ASM_OPERANDS) + { + rtx asmop = body; + /* No output operands: BODY is (asm_operands ....). */ + + noperands = ASM_OPERANDS_INPUT_LENGTH (asmop); + + /* The input operands are found in the 1st element vector. */ + /* Constraints for inputs are in the 2nd element vector. */ + for (i = 0; i < noperands; i++) + { + if (operand_locs) + operand_locs[i] = &ASM_OPERANDS_INPUT (asmop, i); + if (operands) + operands[i] = ASM_OPERANDS_INPUT (asmop, i); + if (constraints) + constraints[i] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i); + if (modes) + modes[i] = ASM_OPERANDS_INPUT_MODE (asmop, i); + } + template = ASM_OPERANDS_TEMPLATE (asmop); + } + else if (GET_CODE (body) == PARALLEL + && GET_CODE (XVECEXP (body, 0, 0)) == SET + && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) == ASM_OPERANDS) + { + rtx asmop = SET_SRC (XVECEXP (body, 0, 0)); + /* APPLE LOCAL begin CW asm blocks */ + int nparallel = XVECLEN (body, 0); /* Includes CLOBBERs/USEs. */ + int nin = ASM_OPERANDS_INPUT_LENGTH (asmop); + int nout = 0; /* Does not include CLOBBERs/USEs. */ + /* APPLE LOCAL end CW asm blocks */ + + /* At least one output, plus some CLOBBERs. */ + + /* The outputs are in the SETs. + Their constraints are in the ASM_OPERANDS itself. */ + for (i = 0; i < nparallel; i++) + { + /* APPLE LOCAL begin CW asm blocks */ + if (GET_CODE (XVECEXP (body, 0, i)) == CLOBBER + || GET_CODE (XVECEXP (body, 0, i)) == USE) + /* APPLE LOCAL end CW asm blocks */ + break; /* Past last SET */ + + if (operands) + operands[i] = SET_DEST (XVECEXP (body, 0, i)); + if (operand_locs) + operand_locs[i] = &SET_DEST (XVECEXP (body, 0, i)); + if (constraints) + constraints[i] = XSTR (SET_SRC (XVECEXP (body, 0, i)), 1); + if (modes) + modes[i] = GET_MODE (SET_DEST (XVECEXP (body, 0, i))); + nout++; + } + + for (i = 0; i < nin; i++) + { + if (operand_locs) + operand_locs[i + nout] = &ASM_OPERANDS_INPUT (asmop, i); + if (operands) + operands[i + nout] = ASM_OPERANDS_INPUT (asmop, i); + if (constraints) + constraints[i + nout] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i); + if (modes) + modes[i + nout] = ASM_OPERANDS_INPUT_MODE (asmop, i); + } + + template = ASM_OPERANDS_TEMPLATE (asmop); + } + else if (GET_CODE (body) == PARALLEL + && GET_CODE (XVECEXP (body, 0, 0)) == ASM_OPERANDS) + { + /* No outputs, but some CLOBBERs. */ + + rtx asmop = XVECEXP (body, 0, 0); + int nin = ASM_OPERANDS_INPUT_LENGTH (asmop); + + for (i = 0; i < nin; i++) + { + if (operand_locs) + operand_locs[i] = &ASM_OPERANDS_INPUT (asmop, i); + if (operands) + operands[i] = ASM_OPERANDS_INPUT (asmop, i); + if (constraints) + constraints[i] = ASM_OPERANDS_INPUT_CONSTRAINT (asmop, i); + if (modes) + modes[i] = ASM_OPERANDS_INPUT_MODE (asmop, i); + } + + template = ASM_OPERANDS_TEMPLATE (asmop); + } + + return template; +} + +/* Check if an asm_operand matches its constraints. + Return > 0 if ok, = 0 if bad, < 0 if inconclusive. */ + +int +asm_operand_ok (rtx op, const char *constraint) +{ + int result = 0; + + /* Use constrain_operands after reload. */ + gcc_assert (!reload_completed); + + while (*constraint) + { + char c = *constraint; + int len; + switch (c) + { + case ',': + constraint++; + continue; + case '=': + case '+': + case '*': + case '%': + case '!': + case '#': + case '&': + case '?': + break; + + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + /* For best results, our caller should have given us the + proper matching constraint, but we can't actually fail + the check if they didn't. Indicate that results are + inconclusive. */ + do + constraint++; + while (ISDIGIT (*constraint)); + if (! result) + result = -1; + continue; + + case 'p': + if (address_operand (op, VOIDmode)) + result = 1; + break; + + case 'm': + case 'V': /* non-offsettable */ + if (memory_operand (op, VOIDmode)) + result = 1; + break; + + case 'o': /* offsettable */ + if (offsettable_nonstrict_memref_p (op)) + result = 1; + break; + + case '<': + /* ??? Before flow, auto inc/dec insns are not supposed to exist, + excepting those that expand_call created. Further, on some + machines which do not have generalized auto inc/dec, an inc/dec + is not a memory_operand. + + Match any memory and hope things are resolved after reload. */ + + if (MEM_P (op) + && (1 + || GET_CODE (XEXP (op, 0)) == PRE_DEC + || GET_CODE (XEXP (op, 0)) == POST_DEC)) + result = 1; + break; + + case '>': + if (MEM_P (op) + && (1 + || GET_CODE (XEXP (op, 0)) == PRE_INC + || GET_CODE (XEXP (op, 0)) == POST_INC)) + result = 1; + break; + + case 'E': + case 'F': + if (GET_CODE (op) == CONST_DOUBLE + || (GET_CODE (op) == CONST_VECTOR + && GET_MODE_CLASS (GET_MODE (op)) == MODE_VECTOR_FLOAT)) + result = 1; + break; + + case 'G': + if (GET_CODE (op) == CONST_DOUBLE + && CONST_DOUBLE_OK_FOR_CONSTRAINT_P (op, 'G', constraint)) + result = 1; + break; + case 'H': + if (GET_CODE (op) == CONST_DOUBLE + && CONST_DOUBLE_OK_FOR_CONSTRAINT_P (op, 'H', constraint)) + result = 1; + break; + + case 's': + if (GET_CODE (op) == CONST_INT + || (GET_CODE (op) == CONST_DOUBLE + && GET_MODE (op) == VOIDmode)) + break; + /* Fall through. */ + + case 'i': + /* APPLE LOCAL ARM -mdynamic-no-pic support */ + if (CONSTANT_P (op) && LEGITIMATE_INDIRECT_OPERAND_P (op)) + result = 1; + break; + + case 'n': + if (GET_CODE (op) == CONST_INT + || (GET_CODE (op) == CONST_DOUBLE + && GET_MODE (op) == VOIDmode)) + result = 1; + break; + + case 'I': + if (GET_CODE (op) == CONST_INT + && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), 'I', constraint)) + result = 1; + break; + case 'J': + if (GET_CODE (op) == CONST_INT + && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), 'J', constraint)) + result = 1; + break; + case 'K': + if (GET_CODE (op) == CONST_INT + && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), 'K', constraint)) + result = 1; + break; + case 'L': + if (GET_CODE (op) == CONST_INT + && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), 'L', constraint)) + result = 1; + break; + case 'M': + if (GET_CODE (op) == CONST_INT + && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), 'M', constraint)) + result = 1; + break; + case 'N': + if (GET_CODE (op) == CONST_INT + && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), 'N', constraint)) + result = 1; + break; + case 'O': + if (GET_CODE (op) == CONST_INT + && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), 'O', constraint)) + result = 1; + break; + case 'P': + if (GET_CODE (op) == CONST_INT + && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), 'P', constraint)) + result = 1; + break; + + case 'X': + result = 1; + break; + + case 'g': + if (general_operand (op, VOIDmode)) + result = 1; + break; + + default: + /* For all other letters, we first check for a register class, + otherwise it is an EXTRA_CONSTRAINT. */ + if (REG_CLASS_FROM_CONSTRAINT (c, constraint) != NO_REGS) + { + case 'r': + if (GET_MODE (op) == BLKmode) + break; + if (register_operand (op, VOIDmode)) + result = 1; + } +#ifdef EXTRA_CONSTRAINT_STR + else if (EXTRA_CONSTRAINT_STR (op, c, constraint)) + result = 1; + else if (EXTRA_MEMORY_CONSTRAINT (c, constraint) + /* Every memory operand can be reloaded to fit. */ + && memory_operand (op, VOIDmode)) + result = 1; + else if (EXTRA_ADDRESS_CONSTRAINT (c, constraint) + /* Every address operand can be reloaded to fit. */ + && address_operand (op, VOIDmode)) + result = 1; +#endif + break; + } + len = CONSTRAINT_LEN (c, constraint); + do + constraint++; + while (--len && *constraint); + if (len) + return 0; + } + + return result; +} + +/* Given an rtx *P, if it is a sum containing an integer constant term, + return the location (type rtx *) of the pointer to that constant term. + Otherwise, return a null pointer. */ + +rtx * +find_constant_term_loc (rtx *p) +{ + rtx *tem; + enum rtx_code code = GET_CODE (*p); + + /* If *P IS such a constant term, P is its location. */ + + if (code == CONST_INT || code == SYMBOL_REF || code == LABEL_REF + || code == CONST) + return p; + + /* Otherwise, if not a sum, it has no constant term. */ + + if (GET_CODE (*p) != PLUS) + return 0; + + /* If one of the summands is constant, return its location. */ + + if (XEXP (*p, 0) && CONSTANT_P (XEXP (*p, 0)) + && XEXP (*p, 1) && CONSTANT_P (XEXP (*p, 1))) + return p; + + /* Otherwise, check each summand for containing a constant term. */ + + if (XEXP (*p, 0) != 0) + { + tem = find_constant_term_loc (&XEXP (*p, 0)); + if (tem != 0) + return tem; + } + + if (XEXP (*p, 1) != 0) + { + tem = find_constant_term_loc (&XEXP (*p, 1)); + if (tem != 0) + return tem; + } + + return 0; +} + +/* Return 1 if OP is a memory reference + whose address contains no side effects + and remains valid after the addition + of a positive integer less than the + size of the object being referenced. + + We assume that the original address is valid and do not check it. + + This uses strict_memory_address_p as a subroutine, so + don't use it before reload. */ + +int +offsettable_memref_p (rtx op) +{ + return ((MEM_P (op)) + && offsettable_address_p (1, GET_MODE (op), XEXP (op, 0))); +} + +/* Similar, but don't require a strictly valid mem ref: + consider pseudo-regs valid as index or base regs. */ + +int +offsettable_nonstrict_memref_p (rtx op) +{ + return ((MEM_P (op)) + && offsettable_address_p (0, GET_MODE (op), XEXP (op, 0))); +} + +/* Return 1 if Y is a memory address which contains no side effects + and would remain valid after the addition of a positive integer + less than the size of that mode. + + We assume that the original address is valid and do not check it. + We do check that it is valid for narrower modes. + + If STRICTP is nonzero, we require a strictly valid address, + for the sake of use in reload.c. */ + +int +offsettable_address_p (int strictp, enum machine_mode mode, rtx y) +{ + enum rtx_code ycode = GET_CODE (y); + rtx z; + rtx y1 = y; + rtx *y2; + int (*addressp) (enum machine_mode, rtx) = + (strictp ? strict_memory_address_p : memory_address_p); + unsigned int mode_sz = GET_MODE_SIZE (mode); + + if (CONSTANT_ADDRESS_P (y)) + return 1; + + /* Adjusting an offsettable address involves changing to a narrower mode. + Make sure that's OK. */ + + if (mode_dependent_address_p (y)) + return 0; + + /* ??? How much offset does an offsettable BLKmode reference need? + Clearly that depends on the situation in which it's being used. + However, the current situation in which we test 0xffffffff is + less than ideal. Caveat user. */ + if (mode_sz == 0) + mode_sz = BIGGEST_ALIGNMENT / BITS_PER_UNIT; + + /* If the expression contains a constant term, + see if it remains valid when max possible offset is added. */ + + if ((ycode == PLUS) && (y2 = find_constant_term_loc (&y1))) + { + int good; + + y1 = *y2; + *y2 = plus_constant (*y2, mode_sz - 1); + /* Use QImode because an odd displacement may be automatically invalid + for any wider mode. But it should be valid for a single byte. */ + good = (*addressp) (QImode, y); + + /* In any case, restore old contents of memory. */ + *y2 = y1; + return good; + } + + if (GET_RTX_CLASS (ycode) == RTX_AUTOINC) + return 0; + + /* The offset added here is chosen as the maximum offset that + any instruction could need to add when operating on something + of the specified mode. We assume that if Y and Y+c are + valid addresses then so is Y+d for all 0<d<c. adjust_address will + go inside a LO_SUM here, so we do so as well. */ + if (GET_CODE (y) == LO_SUM + && mode != BLKmode + && mode_sz <= GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT) + z = gen_rtx_LO_SUM (GET_MODE (y), XEXP (y, 0), + plus_constant (XEXP (y, 1), mode_sz - 1)); + else + z = plus_constant (y, mode_sz - 1); + + /* Use QImode because an odd displacement may be automatically invalid + for any wider mode. But it should be valid for a single byte. */ + return (*addressp) (QImode, z); +} + +/* Return 1 if ADDR is an address-expression whose effect depends + on the mode of the memory reference it is used in. + + Autoincrement addressing is a typical example of mode-dependence + because the amount of the increment depends on the mode. */ + +int +mode_dependent_address_p (rtx addr ATTRIBUTE_UNUSED /* Maybe used in GO_IF_MODE_DEPENDENT_ADDRESS. */) +{ + GO_IF_MODE_DEPENDENT_ADDRESS (addr, win); + return 0; + /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */ + win: ATTRIBUTE_UNUSED_LABEL + return 1; +} + +/* Like extract_insn, but save insn extracted and don't extract again, when + called again for the same insn expecting that recog_data still contain the + valid information. This is used primary by gen_attr infrastructure that + often does extract insn again and again. */ +void +extract_insn_cached (rtx insn) +{ + if (recog_data.insn == insn && INSN_CODE (insn) >= 0) + return; + extract_insn (insn); + recog_data.insn = insn; +} + +/* Do cached extract_insn, constrain_operands and complain about failures. + Used by insn_attrtab. */ +void +extract_constrain_insn_cached (rtx insn) +{ + extract_insn_cached (insn); + if (which_alternative == -1 + && !constrain_operands (reload_completed)) + fatal_insn_not_found (insn); +} + +/* Do cached constrain_operands and complain about failures. */ +int +constrain_operands_cached (int strict) +{ + if (which_alternative == -1) + return constrain_operands (strict); + else + return 1; +} + +/* Analyze INSN and fill in recog_data. */ + +void +extract_insn (rtx insn) +{ + int i; + int icode; + int noperands; + rtx body = PATTERN (insn); + + recog_data.insn = NULL; + recog_data.n_operands = 0; + recog_data.n_alternatives = 0; + recog_data.n_dups = 0; + which_alternative = -1; + + switch (GET_CODE (body)) + { + case USE: + case CLOBBER: + case ASM_INPUT: + case ADDR_VEC: + case ADDR_DIFF_VEC: + return; + + case SET: + if (GET_CODE (SET_SRC (body)) == ASM_OPERANDS) + goto asm_insn; + else + goto normal_insn; + case PARALLEL: + if ((GET_CODE (XVECEXP (body, 0, 0)) == SET + && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) == ASM_OPERANDS) + || GET_CODE (XVECEXP (body, 0, 0)) == ASM_OPERANDS) + goto asm_insn; + else + goto normal_insn; + case ASM_OPERANDS: + asm_insn: + recog_data.n_operands = noperands = asm_noperands (body); + if (noperands >= 0) + { + /* This insn is an `asm' with operands. */ + + /* expand_asm_operands makes sure there aren't too many operands. */ + gcc_assert (noperands <= MAX_RECOG_OPERANDS); + + /* Now get the operand values and constraints out of the insn. */ + decode_asm_operands (body, recog_data.operand, + recog_data.operand_loc, + recog_data.constraints, + recog_data.operand_mode); + if (noperands > 0) + { + const char *p = recog_data.constraints[0]; + recog_data.n_alternatives = 1; + while (*p) + recog_data.n_alternatives += (*p++ == ','); + } + break; + } + fatal_insn_not_found (insn); + + default: + normal_insn: + /* Ordinary insn: recognize it, get the operands via insn_extract + and get the constraints. */ + + icode = recog_memoized (insn); + if (icode < 0) + fatal_insn_not_found (insn); + + recog_data.n_operands = noperands = insn_data[icode].n_operands; + recog_data.n_alternatives = insn_data[icode].n_alternatives; + recog_data.n_dups = insn_data[icode].n_dups; + + insn_extract (insn); + + for (i = 0; i < noperands; i++) + { + recog_data.constraints[i] = insn_data[icode].operand[i].constraint; + recog_data.operand_mode[i] = insn_data[icode].operand[i].mode; + /* VOIDmode match_operands gets mode from their real operand. */ + if (recog_data.operand_mode[i] == VOIDmode) + recog_data.operand_mode[i] = GET_MODE (recog_data.operand[i]); + } + } + for (i = 0; i < noperands; i++) + recog_data.operand_type[i] + = (recog_data.constraints[i][0] == '=' ? OP_OUT + : recog_data.constraints[i][0] == '+' ? OP_INOUT + : OP_IN); + + gcc_assert (recog_data.n_alternatives <= MAX_RECOG_ALTERNATIVES); +} + +/* After calling extract_insn, you can use this function to extract some + information from the constraint strings into a more usable form. + The collected data is stored in recog_op_alt. */ +void +preprocess_constraints (void) +{ + int i; + + for (i = 0; i < recog_data.n_operands; i++) + memset (recog_op_alt[i], 0, (recog_data.n_alternatives + * sizeof (struct operand_alternative))); + + for (i = 0; i < recog_data.n_operands; i++) + { + int j; + struct operand_alternative *op_alt; + const char *p = recog_data.constraints[i]; + + op_alt = recog_op_alt[i]; + + for (j = 0; j < recog_data.n_alternatives; j++) + { + op_alt[j].cl = NO_REGS; + op_alt[j].constraint = p; + op_alt[j].matches = -1; + op_alt[j].matched = -1; + + if (*p == '\0' || *p == ',') + { + op_alt[j].anything_ok = 1; + continue; + } + + for (;;) + { + char c = *p; + if (c == '#') + do + c = *++p; + while (c != ',' && c != '\0'); + if (c == ',' || c == '\0') + { + p++; + break; + } + + switch (c) + { + case '=': case '+': case '*': case '%': + case 'E': case 'F': case 'G': case 'H': + case 's': case 'i': case 'n': + case 'I': case 'J': case 'K': case 'L': + case 'M': case 'N': case 'O': case 'P': + /* These don't say anything we care about. */ + break; + + case '?': + op_alt[j].reject += 6; + break; + case '!': + op_alt[j].reject += 600; + break; + case '&': + op_alt[j].earlyclobber = 1; + break; + + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + { + char *end; + op_alt[j].matches = strtoul (p, &end, 10); + recog_op_alt[op_alt[j].matches][j].matched = i; + p = end; + } + continue; + + case 'm': + op_alt[j].memory_ok = 1; + break; + case '<': + op_alt[j].decmem_ok = 1; + break; + case '>': + op_alt[j].incmem_ok = 1; + break; + case 'V': + op_alt[j].nonoffmem_ok = 1; + break; + case 'o': + op_alt[j].offmem_ok = 1; + break; + case 'X': + op_alt[j].anything_ok = 1; + break; + + case 'p': + op_alt[j].is_address = 1; + op_alt[j].cl = reg_class_subunion[(int) op_alt[j].cl] + [(int) base_reg_class (VOIDmode, ADDRESS, SCRATCH)]; + break; + + case 'g': + case 'r': + op_alt[j].cl = + reg_class_subunion[(int) op_alt[j].cl][(int) GENERAL_REGS]; + break; + + default: + if (EXTRA_MEMORY_CONSTRAINT (c, p)) + { + op_alt[j].memory_ok = 1; + break; + } + if (EXTRA_ADDRESS_CONSTRAINT (c, p)) + { + op_alt[j].is_address = 1; + op_alt[j].cl + = (reg_class_subunion + [(int) op_alt[j].cl] + [(int) base_reg_class (VOIDmode, ADDRESS, + SCRATCH)]); + break; + } + + op_alt[j].cl + = (reg_class_subunion + [(int) op_alt[j].cl] + [(int) REG_CLASS_FROM_CONSTRAINT ((unsigned char) c, p)]); + break; + } + p += CONSTRAINT_LEN (c, p); + } + } + } +} + +/* Check the operands of an insn against the insn's operand constraints + and return 1 if they are valid. + The information about the insn's operands, constraints, operand modes + etc. is obtained from the global variables set up by extract_insn. + + WHICH_ALTERNATIVE is set to a number which indicates which + alternative of constraints was matched: 0 for the first alternative, + 1 for the next, etc. + + In addition, when two operands are required to match + and it happens that the output operand is (reg) while the + input operand is --(reg) or ++(reg) (a pre-inc or pre-dec), + make the output operand look like the input. + This is because the output operand is the one the template will print. + + This is used in final, just before printing the assembler code and by + the routines that determine an insn's attribute. + + If STRICT is a positive nonzero value, it means that we have been + called after reload has been completed. In that case, we must + do all checks strictly. If it is zero, it means that we have been called + before reload has completed. In that case, we first try to see if we can + find an alternative that matches strictly. If not, we try again, this + time assuming that reload will fix up the insn. This provides a "best + guess" for the alternative and is used to compute attributes of insns prior + to reload. A negative value of STRICT is used for this internal call. */ + +struct funny_match +{ + int this, other; +}; + +int +constrain_operands (int strict) +{ + const char *constraints[MAX_RECOG_OPERANDS]; + int matching_operands[MAX_RECOG_OPERANDS]; + int earlyclobber[MAX_RECOG_OPERANDS]; + int c; + + struct funny_match funny_match[MAX_RECOG_OPERANDS]; + int funny_match_index; + + which_alternative = 0; + if (recog_data.n_operands == 0 || recog_data.n_alternatives == 0) + return 1; + + for (c = 0; c < recog_data.n_operands; c++) + { + constraints[c] = recog_data.constraints[c]; + matching_operands[c] = -1; + } + + do + { + int seen_earlyclobber_at = -1; + int opno; + int lose = 0; + funny_match_index = 0; + + for (opno = 0; opno < recog_data.n_operands; opno++) + { + rtx op = recog_data.operand[opno]; + enum machine_mode mode = GET_MODE (op); + const char *p = constraints[opno]; + int offset = 0; + int win = 0; + int val; + int len; + + earlyclobber[opno] = 0; + + /* A unary operator may be accepted by the predicate, but it + is irrelevant for matching constraints. */ + if (UNARY_P (op)) + op = XEXP (op, 0); + + if (GET_CODE (op) == SUBREG) + { + if (REG_P (SUBREG_REG (op)) + && REGNO (SUBREG_REG (op)) < FIRST_PSEUDO_REGISTER) + offset = subreg_regno_offset (REGNO (SUBREG_REG (op)), + GET_MODE (SUBREG_REG (op)), + SUBREG_BYTE (op), + GET_MODE (op)); + op = SUBREG_REG (op); + } + + /* An empty constraint or empty alternative + allows anything which matched the pattern. */ + if (*p == 0 || *p == ',') + win = 1; + + do + switch (c = *p, len = CONSTRAINT_LEN (c, p), c) + { + case '\0': + len = 0; + break; + case ',': + c = '\0'; + break; + + case '?': case '!': case '*': case '%': + case '=': case '+': + break; + + case '#': + /* Ignore rest of this alternative as far as + constraint checking is concerned. */ + do + p++; + while (*p && *p != ','); + len = 0; + break; + + case '&': + earlyclobber[opno] = 1; + if (seen_earlyclobber_at < 0) + seen_earlyclobber_at = opno; + break; + + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + { + /* This operand must be the same as a previous one. + This kind of constraint is used for instructions such + as add when they take only two operands. + + Note that the lower-numbered operand is passed first. + + If we are not testing strictly, assume that this + constraint will be satisfied. */ + + char *end; + int match; + + match = strtoul (p, &end, 10); + p = end; + + if (strict < 0) + val = 1; + else + { + rtx op1 = recog_data.operand[match]; + rtx op2 = recog_data.operand[opno]; + + /* A unary operator may be accepted by the predicate, + but it is irrelevant for matching constraints. */ + if (UNARY_P (op1)) + op1 = XEXP (op1, 0); + if (UNARY_P (op2)) + op2 = XEXP (op2, 0); + + val = operands_match_p (op1, op2); + } + + matching_operands[opno] = match; + matching_operands[match] = opno; + + if (val != 0) + win = 1; + + /* If output is *x and input is *--x, arrange later + to change the output to *--x as well, since the + output op is the one that will be printed. */ + if (val == 2 && strict > 0) + { + funny_match[funny_match_index].this = opno; + funny_match[funny_match_index++].other = match; + } + } + len = 0; + break; + + case 'p': + /* p is used for address_operands. When we are called by + gen_reload, no one will have checked that the address is + strictly valid, i.e., that all pseudos requiring hard regs + have gotten them. */ + if (strict <= 0 + || (strict_memory_address_p (recog_data.operand_mode[opno], + op))) + win = 1; + break; + + /* No need to check general_operand again; + it was done in insn-recog.c. Well, except that reload + doesn't check the validity of its replacements, but + that should only matter when there's a bug. */ + case 'g': + /* Anything goes unless it is a REG and really has a hard reg + but the hard reg is not in the class GENERAL_REGS. */ + if (REG_P (op)) + { + if (strict < 0 + || GENERAL_REGS == ALL_REGS + || (reload_in_progress + && REGNO (op) >= FIRST_PSEUDO_REGISTER) + || reg_fits_class_p (op, GENERAL_REGS, offset, mode)) + win = 1; + } + else if (strict < 0 || general_operand (op, mode)) + win = 1; + break; + + case 'X': + /* This is used for a MATCH_SCRATCH in the cases when + we don't actually need anything. So anything goes + any time. */ + win = 1; + break; + + case 'm': + /* Memory operands must be valid, to the extent + required by STRICT. */ + if (MEM_P (op)) + { + if (strict > 0 + && !strict_memory_address_p (GET_MODE (op), + XEXP (op, 0))) + break; + if (strict == 0 + && !memory_address_p (GET_MODE (op), XEXP (op, 0))) + break; + win = 1; + } + /* Before reload, accept what reload can turn into mem. */ + else if (strict < 0 && CONSTANT_P (op)) + win = 1; + /* During reload, accept a pseudo */ + else if (reload_in_progress && REG_P (op) + && REGNO (op) >= FIRST_PSEUDO_REGISTER) + win = 1; + break; + + case '<': + if (MEM_P (op) + && (GET_CODE (XEXP (op, 0)) == PRE_DEC + || GET_CODE (XEXP (op, 0)) == POST_DEC)) + win = 1; + break; + + case '>': + if (MEM_P (op) + && (GET_CODE (XEXP (op, 0)) == PRE_INC + || GET_CODE (XEXP (op, 0)) == POST_INC)) + win = 1; + break; + + case 'E': + case 'F': + if (GET_CODE (op) == CONST_DOUBLE + || (GET_CODE (op) == CONST_VECTOR + && GET_MODE_CLASS (GET_MODE (op)) == MODE_VECTOR_FLOAT)) + win = 1; + break; + + case 'G': + case 'H': + if (GET_CODE (op) == CONST_DOUBLE + && CONST_DOUBLE_OK_FOR_CONSTRAINT_P (op, c, p)) + win = 1; + break; + + case 's': + if (GET_CODE (op) == CONST_INT + || (GET_CODE (op) == CONST_DOUBLE + && GET_MODE (op) == VOIDmode)) + break; + case 'i': + if (CONSTANT_P (op)) + win = 1; + break; + + case 'n': + if (GET_CODE (op) == CONST_INT + || (GET_CODE (op) == CONST_DOUBLE + && GET_MODE (op) == VOIDmode)) + win = 1; + break; + + case 'I': + case 'J': + case 'K': + case 'L': + case 'M': + case 'N': + case 'O': + case 'P': + if (GET_CODE (op) == CONST_INT + && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), c, p)) + win = 1; + break; + + case 'V': + if (MEM_P (op) + && ((strict > 0 && ! offsettable_memref_p (op)) + || (strict < 0 + && !(CONSTANT_P (op) || MEM_P (op))) + || (reload_in_progress + && !(REG_P (op) + && REGNO (op) >= FIRST_PSEUDO_REGISTER)))) + win = 1; + break; + + case 'o': + if ((strict > 0 && offsettable_memref_p (op)) + || (strict == 0 && offsettable_nonstrict_memref_p (op)) + /* Before reload, accept what reload can handle. */ + || (strict < 0 + && (CONSTANT_P (op) || MEM_P (op))) + /* During reload, accept a pseudo */ + || (reload_in_progress && REG_P (op) + && REGNO (op) >= FIRST_PSEUDO_REGISTER)) + win = 1; + break; + + default: + { + enum reg_class cl; + + cl = (c == 'r' + ? GENERAL_REGS : REG_CLASS_FROM_CONSTRAINT (c, p)); + if (cl != NO_REGS) + { + if (strict < 0 + || (strict == 0 + && REG_P (op) + && REGNO (op) >= FIRST_PSEUDO_REGISTER) + || (strict == 0 && GET_CODE (op) == SCRATCH) + || (REG_P (op) + && reg_fits_class_p (op, cl, offset, mode))) + win = 1; + } +#ifdef EXTRA_CONSTRAINT_STR + else if (EXTRA_CONSTRAINT_STR (op, c, p)) + win = 1; + + else if (EXTRA_MEMORY_CONSTRAINT (c, p) + /* Every memory operand can be reloaded to fit. */ + && ((strict < 0 && MEM_P (op)) + /* Before reload, accept what reload can turn + into mem. */ + || (strict < 0 && CONSTANT_P (op)) + /* During reload, accept a pseudo */ + || (reload_in_progress && REG_P (op) + && REGNO (op) >= FIRST_PSEUDO_REGISTER))) + win = 1; + else if (EXTRA_ADDRESS_CONSTRAINT (c, p) + /* Every address operand can be reloaded to fit. */ + && strict < 0) + win = 1; +#endif + break; + } + } + while (p += len, c); + + constraints[opno] = p; + /* If this operand did not win somehow, + this alternative loses. */ + if (! win) + lose = 1; + } + /* This alternative won; the operands are ok. + Change whichever operands this alternative says to change. */ + if (! lose) + { + int opno, eopno; + + /* See if any earlyclobber operand conflicts with some other + operand. */ + + if (strict > 0 && seen_earlyclobber_at >= 0) + for (eopno = seen_earlyclobber_at; + eopno < recog_data.n_operands; + eopno++) + /* Ignore earlyclobber operands now in memory, + because we would often report failure when we have + two memory operands, one of which was formerly a REG. */ + if (earlyclobber[eopno] + && REG_P (recog_data.operand[eopno])) + for (opno = 0; opno < recog_data.n_operands; opno++) + if ((MEM_P (recog_data.operand[opno]) + || recog_data.operand_type[opno] != OP_OUT) + && opno != eopno + /* Ignore things like match_operator operands. */ + && *recog_data.constraints[opno] != 0 + && ! (matching_operands[opno] == eopno + && operands_match_p (recog_data.operand[opno], + recog_data.operand[eopno])) + && ! safe_from_earlyclobber (recog_data.operand[opno], + recog_data.operand[eopno])) + lose = 1; + + if (! lose) + { + while (--funny_match_index >= 0) + { + recog_data.operand[funny_match[funny_match_index].other] + = recog_data.operand[funny_match[funny_match_index].this]; + } + + return 1; + } + } + + which_alternative++; + } + while (which_alternative < recog_data.n_alternatives); + + which_alternative = -1; + /* If we are about to reject this, but we are not to test strictly, + try a very loose test. Only return failure if it fails also. */ + if (strict == 0) + return constrain_operands (-1); + else + return 0; +} + +/* Return 1 iff OPERAND (assumed to be a REG rtx) + is a hard reg in class CLASS when its regno is offset by OFFSET + and changed to mode MODE. + If REG occupies multiple hard regs, all of them must be in CLASS. */ + +int +reg_fits_class_p (rtx operand, enum reg_class cl, int offset, + enum machine_mode mode) +{ + int regno = REGNO (operand); + + if (cl == NO_REGS) + return 0; + + if (regno < FIRST_PSEUDO_REGISTER + && TEST_HARD_REG_BIT (reg_class_contents[(int) cl], + regno + offset)) + { + int sr; + regno += offset; + for (sr = hard_regno_nregs[regno][mode] - 1; + sr > 0; sr--) + if (! TEST_HARD_REG_BIT (reg_class_contents[(int) cl], + regno + sr)) + break; + return sr == 0; + } + + return 0; +} + +/* Split single instruction. Helper function for split_all_insns and + split_all_insns_noflow. Return last insn in the sequence if successful, + or NULL if unsuccessful. */ + +static rtx +split_insn (rtx insn) +{ + /* Split insns here to get max fine-grain parallelism. */ + rtx first = PREV_INSN (insn); + rtx last = try_split (PATTERN (insn), insn, 1); + + if (last == insn) + return NULL_RTX; + + /* try_split returns the NOTE that INSN became. */ + SET_INSN_DELETED (insn); + + /* ??? Coddle to md files that generate subregs in post-reload + splitters instead of computing the proper hard register. */ + if (reload_completed && first != last) + { + first = NEXT_INSN (first); + for (;;) + { + if (INSN_P (first)) + cleanup_subreg_operands (first); + if (first == last) + break; + first = NEXT_INSN (first); + } + } + return last; +} + +/* Split all insns in the function. If UPD_LIFE, update life info after. */ + +void +split_all_insns (int upd_life) +{ + sbitmap blocks; + bool changed; + basic_block bb; + + blocks = sbitmap_alloc (last_basic_block); + sbitmap_zero (blocks); + changed = false; + + FOR_EACH_BB_REVERSE (bb) + { + rtx insn, next; + bool finish = false; + + for (insn = BB_HEAD (bb); !finish ; insn = next) + { + /* Can't use `next_real_insn' because that might go across + CODE_LABELS and short-out basic blocks. */ + next = NEXT_INSN (insn); + finish = (insn == BB_END (bb)); + if (INSN_P (insn)) + { + rtx set = single_set (insn); + + /* Don't split no-op move insns. These should silently + disappear later in final. Splitting such insns would + break the code that handles REG_NO_CONFLICT blocks. */ + if (set && set_noop_p (set)) + { + /* Nops get in the way while scheduling, so delete them + now if register allocation has already been done. It + is too risky to try to do this before register + allocation, and there are unlikely to be very many + nops then anyways. */ + if (reload_completed) + { + /* If the no-op set has a REG_UNUSED note, we need + to update liveness information. */ + if (find_reg_note (insn, REG_UNUSED, NULL_RTX)) + { + SET_BIT (blocks, bb->index); + changed = true; + } + /* ??? Is life info affected by deleting edges? */ + delete_insn_and_edges (insn); + } + } + else + { + rtx last = split_insn (insn); + if (last) + { + /* The split sequence may include barrier, but the + BB boundary we are interested in will be set to + previous one. */ + + while (BARRIER_P (last)) + last = PREV_INSN (last); + SET_BIT (blocks, bb->index); + changed = true; + } + } + } + } + } + + if (changed) + { + int old_last_basic_block = last_basic_block; + + find_many_sub_basic_blocks (blocks); + + if (old_last_basic_block != last_basic_block && upd_life) + blocks = sbitmap_resize (blocks, last_basic_block, 1); + } + + if (changed && upd_life) + update_life_info (blocks, UPDATE_LIFE_GLOBAL_RM_NOTES, + PROP_DEATH_NOTES); + +#ifdef ENABLE_CHECKING + verify_flow_info (); +#endif + + sbitmap_free (blocks); +} + +/* Same as split_all_insns, but do not expect CFG to be available. + Used by machine dependent reorg passes. */ + +unsigned int +split_all_insns_noflow (void) +{ + rtx next, insn; + + for (insn = get_insns (); insn; insn = next) + { + next = NEXT_INSN (insn); + if (INSN_P (insn)) + { + /* Don't split no-op move insns. These should silently + disappear later in final. Splitting such insns would + break the code that handles REG_NO_CONFLICT blocks. */ + rtx set = single_set (insn); + if (set && set_noop_p (set)) + { + /* Nops get in the way while scheduling, so delete them + now if register allocation has already been done. It + is too risky to try to do this before register + allocation, and there are unlikely to be very many + nops then anyways. + + ??? Should we use delete_insn when the CFG isn't valid? */ + if (reload_completed) + delete_insn_and_edges (insn); + } + else + split_insn (insn); + } + } + return 0; +} + +#ifdef HAVE_peephole2 +struct peep2_insn_data +{ + rtx insn; + regset live_before; +}; + +static struct peep2_insn_data peep2_insn_data[MAX_INSNS_PER_PEEP2 + 1]; +static int peep2_current; +/* The number of instructions available to match a peep2. */ +int peep2_current_count; + +/* A non-insn marker indicating the last insn of the block. + The live_before regset for this element is correct, indicating + global_live_at_end for the block. */ +#define PEEP2_EOB pc_rtx + +/* Return the Nth non-note insn after `current', or return NULL_RTX if it + does not exist. Used by the recognizer to find the next insn to match + in a multi-insn pattern. */ + +rtx +peep2_next_insn (int n) +{ + gcc_assert (n <= peep2_current_count); + + n += peep2_current; + if (n >= MAX_INSNS_PER_PEEP2 + 1) + n -= MAX_INSNS_PER_PEEP2 + 1; + + return peep2_insn_data[n].insn; +} + +/* Return true if REGNO is dead before the Nth non-note insn + after `current'. */ + +int +peep2_regno_dead_p (int ofs, int regno) +{ + gcc_assert (ofs < MAX_INSNS_PER_PEEP2 + 1); + + ofs += peep2_current; + if (ofs >= MAX_INSNS_PER_PEEP2 + 1) + ofs -= MAX_INSNS_PER_PEEP2 + 1; + + gcc_assert (peep2_insn_data[ofs].insn != NULL_RTX); + + return ! REGNO_REG_SET_P (peep2_insn_data[ofs].live_before, regno); +} + +/* Similarly for a REG. */ + +int +peep2_reg_dead_p (int ofs, rtx reg) +{ + int regno, n; + + gcc_assert (ofs < MAX_INSNS_PER_PEEP2 + 1); + + ofs += peep2_current; + if (ofs >= MAX_INSNS_PER_PEEP2 + 1) + ofs -= MAX_INSNS_PER_PEEP2 + 1; + + gcc_assert (peep2_insn_data[ofs].insn != NULL_RTX); + + regno = REGNO (reg); + n = hard_regno_nregs[regno][GET_MODE (reg)]; + while (--n >= 0) + if (REGNO_REG_SET_P (peep2_insn_data[ofs].live_before, regno + n)) + return 0; + return 1; +} + +/* Try to find a hard register of mode MODE, matching the register class in + CLASS_STR, which is available at the beginning of insn CURRENT_INSN and + remains available until the end of LAST_INSN. LAST_INSN may be NULL_RTX, + in which case the only condition is that the register must be available + before CURRENT_INSN. + Registers that already have bits set in REG_SET will not be considered. + + If an appropriate register is available, it will be returned and the + corresponding bit(s) in REG_SET will be set; otherwise, NULL_RTX is + returned. */ + +rtx +peep2_find_free_register (int from, int to, const char *class_str, + enum machine_mode mode, HARD_REG_SET *reg_set) +{ + static int search_ofs; + enum reg_class cl; + HARD_REG_SET live; + int i; + + gcc_assert (from < MAX_INSNS_PER_PEEP2 + 1); + gcc_assert (to < MAX_INSNS_PER_PEEP2 + 1); + + from += peep2_current; + if (from >= MAX_INSNS_PER_PEEP2 + 1) + from -= MAX_INSNS_PER_PEEP2 + 1; + to += peep2_current; + if (to >= MAX_INSNS_PER_PEEP2 + 1) + to -= MAX_INSNS_PER_PEEP2 + 1; + + gcc_assert (peep2_insn_data[from].insn != NULL_RTX); + REG_SET_TO_HARD_REG_SET (live, peep2_insn_data[from].live_before); + + while (from != to) + { + HARD_REG_SET this_live; + + if (++from >= MAX_INSNS_PER_PEEP2 + 1) + from = 0; + gcc_assert (peep2_insn_data[from].insn != NULL_RTX); + REG_SET_TO_HARD_REG_SET (this_live, peep2_insn_data[from].live_before); + IOR_HARD_REG_SET (live, this_live); + } + + cl = (class_str[0] == 'r' ? GENERAL_REGS + : REG_CLASS_FROM_CONSTRAINT (class_str[0], class_str)); + + for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) + { + int raw_regno, regno, success, j; + + /* Distribute the free registers as much as possible. */ + raw_regno = search_ofs + i; + if (raw_regno >= FIRST_PSEUDO_REGISTER) + raw_regno -= FIRST_PSEUDO_REGISTER; +#ifdef REG_ALLOC_ORDER + regno = reg_alloc_order[raw_regno]; +#else + regno = raw_regno; +#endif +/* APPLE LOCAL begin 5831562 add DIMODE_REG_ALLOC_ORDER */ +#ifdef DIMODE_REG_ALLOC_ORDER + if (mode == DImode) + regno = dimode_reg_alloc_order[raw_regno]; +#endif +/* APPLE LOCAL end 5831562 add DIMODE_REG_ALLOC_ORDER */ + /* Don't allocate fixed registers. */ + if (fixed_regs[regno]) + continue; + /* Make sure the register is of the right class. */ + if (! TEST_HARD_REG_BIT (reg_class_contents[cl], regno)) + continue; + /* And can support the mode we need. */ + if (! HARD_REGNO_MODE_OK (regno, mode)) + continue; + /* And that we don't create an extra save/restore. */ + if (! call_used_regs[regno] && ! regs_ever_live[regno]) + continue; + /* And we don't clobber traceback for noreturn functions. */ + if ((regno == FRAME_POINTER_REGNUM || regno == HARD_FRAME_POINTER_REGNUM) + && (! reload_completed || frame_pointer_needed)) + continue; + + success = 1; + for (j = hard_regno_nregs[regno][mode] - 1; j >= 0; j--) + { + if (TEST_HARD_REG_BIT (*reg_set, regno + j) + || TEST_HARD_REG_BIT (live, regno + j)) + { + success = 0; + break; + } + } + if (success) + { + for (j = hard_regno_nregs[regno][mode] - 1; j >= 0; j--) + SET_HARD_REG_BIT (*reg_set, regno + j); + + /* Start the next search with the next register. */ + if (++raw_regno >= FIRST_PSEUDO_REGISTER) + raw_regno = 0; + search_ofs = raw_regno; + + return gen_rtx_REG (mode, regno); + } + } + + search_ofs = 0; + return NULL_RTX; +} + +/* Perform the peephole2 optimization pass. */ + +static void +peephole2_optimize (void) +{ + rtx insn, prev; + regset live; + int i; + basic_block bb; +#ifdef HAVE_conditional_execution + sbitmap blocks; + bool changed; +#endif + bool do_cleanup_cfg = false; + bool do_global_life_update = false; + bool do_rebuild_jump_labels = false; + + /* Initialize the regsets we're going to use. */ + for (i = 0; i < MAX_INSNS_PER_PEEP2 + 1; ++i) + peep2_insn_data[i].live_before = ALLOC_REG_SET (®_obstack); + live = ALLOC_REG_SET (®_obstack); + +#ifdef HAVE_conditional_execution + blocks = sbitmap_alloc (last_basic_block); + sbitmap_zero (blocks); + changed = false; +#else + count_or_remove_death_notes (NULL, 1); +#endif + + FOR_EACH_BB_REVERSE (bb) + { + struct propagate_block_info *pbi; + reg_set_iterator rsi; + unsigned int j; + + /* Indicate that all slots except the last holds invalid data. */ + for (i = 0; i < MAX_INSNS_PER_PEEP2; ++i) + peep2_insn_data[i].insn = NULL_RTX; + peep2_current_count = 0; + + /* Indicate that the last slot contains live_after data. */ + peep2_insn_data[MAX_INSNS_PER_PEEP2].insn = PEEP2_EOB; + peep2_current = MAX_INSNS_PER_PEEP2; + + /* Start up propagation. */ + COPY_REG_SET (live, bb->il.rtl->global_live_at_end); + COPY_REG_SET (peep2_insn_data[MAX_INSNS_PER_PEEP2].live_before, live); + +#ifdef HAVE_conditional_execution + pbi = init_propagate_block_info (bb, live, NULL, NULL, 0); +#else + pbi = init_propagate_block_info (bb, live, NULL, NULL, PROP_DEATH_NOTES); +#endif + + for (insn = BB_END (bb); ; insn = prev) + { + prev = PREV_INSN (insn); + if (INSN_P (insn)) + { + rtx try, before_try, x; + int match_len; + rtx note; + bool was_call = false; + + /* Record this insn. */ + if (--peep2_current < 0) + peep2_current = MAX_INSNS_PER_PEEP2; + if (peep2_current_count < MAX_INSNS_PER_PEEP2 + && peep2_insn_data[peep2_current].insn == NULL_RTX) + peep2_current_count++; + peep2_insn_data[peep2_current].insn = insn; + propagate_one_insn (pbi, insn); + COPY_REG_SET (peep2_insn_data[peep2_current].live_before, live); + + if (RTX_FRAME_RELATED_P (insn)) + { + /* If an insn has RTX_FRAME_RELATED_P set, peephole + substitution would lose the + REG_FRAME_RELATED_EXPR that is attached. */ + peep2_current_count = 0; + try = NULL; + } + else + /* Match the peephole. */ + try = peephole2_insns (PATTERN (insn), insn, &match_len); + + if (try != NULL) + { + /* If we are splitting a CALL_INSN, look for the CALL_INSN + in SEQ and copy our CALL_INSN_FUNCTION_USAGE and other + cfg-related call notes. */ + for (i = 0; i <= match_len; ++i) + { + int j; + rtx old_insn, new_insn, note; + + j = i + peep2_current; + if (j >= MAX_INSNS_PER_PEEP2 + 1) + j -= MAX_INSNS_PER_PEEP2 + 1; + old_insn = peep2_insn_data[j].insn; + if (!CALL_P (old_insn)) + continue; + was_call = true; + + new_insn = try; + while (new_insn != NULL_RTX) + { + if (CALL_P (new_insn)) + break; + new_insn = NEXT_INSN (new_insn); + } + + gcc_assert (new_insn != NULL_RTX); + + CALL_INSN_FUNCTION_USAGE (new_insn) + = CALL_INSN_FUNCTION_USAGE (old_insn); + + for (note = REG_NOTES (old_insn); + note; + note = XEXP (note, 1)) + switch (REG_NOTE_KIND (note)) + { + case REG_NORETURN: + case REG_SETJMP: + REG_NOTES (new_insn) + = gen_rtx_EXPR_LIST (REG_NOTE_KIND (note), + XEXP (note, 0), + REG_NOTES (new_insn)); + default: + /* Discard all other reg notes. */ + break; + } + + /* Croak if there is another call in the sequence. */ + while (++i <= match_len) + { + j = i + peep2_current; + if (j >= MAX_INSNS_PER_PEEP2 + 1) + j -= MAX_INSNS_PER_PEEP2 + 1; + old_insn = peep2_insn_data[j].insn; + gcc_assert (!CALL_P (old_insn)); + } + break; + } + + i = match_len + peep2_current; + if (i >= MAX_INSNS_PER_PEEP2 + 1) + i -= MAX_INSNS_PER_PEEP2 + 1; + + note = find_reg_note (peep2_insn_data[i].insn, + REG_EH_REGION, NULL_RTX); + + /* Replace the old sequence with the new. */ + try = emit_insn_after_setloc (try, peep2_insn_data[i].insn, + INSN_LOCATOR (peep2_insn_data[i].insn)); + before_try = PREV_INSN (insn); + delete_insn_chain (insn, peep2_insn_data[i].insn); + + /* Re-insert the EH_REGION notes. */ + if (note || (was_call && nonlocal_goto_handler_labels)) + { + edge eh_edge; + edge_iterator ei; + + FOR_EACH_EDGE (eh_edge, ei, bb->succs) + if (eh_edge->flags & (EDGE_EH | EDGE_ABNORMAL_CALL)) + break; + + for (x = try ; x != before_try ; x = PREV_INSN (x)) + if (CALL_P (x) + || (flag_non_call_exceptions + && may_trap_p (PATTERN (x)) + && !find_reg_note (x, REG_EH_REGION, NULL))) + { + if (note) + REG_NOTES (x) + = gen_rtx_EXPR_LIST (REG_EH_REGION, + XEXP (note, 0), + REG_NOTES (x)); + + if (x != BB_END (bb) && eh_edge) + { + edge nfte, nehe; + int flags; + + nfte = split_block (bb, x); + flags = (eh_edge->flags + & (EDGE_EH | EDGE_ABNORMAL)); + if (CALL_P (x)) + flags |= EDGE_ABNORMAL_CALL; + nehe = make_edge (nfte->src, eh_edge->dest, + flags); + + nehe->probability = eh_edge->probability; + nfte->probability + = REG_BR_PROB_BASE - nehe->probability; + + do_cleanup_cfg |= purge_dead_edges (nfte->dest); +#ifdef HAVE_conditional_execution + SET_BIT (blocks, nfte->dest->index); + changed = true; +#endif + bb = nfte->src; + eh_edge = nehe; + } + } + + /* Converting possibly trapping insn to non-trapping is + possible. Zap dummy outgoing edges. */ + do_cleanup_cfg |= purge_dead_edges (bb); + } + +#ifdef HAVE_conditional_execution + /* With conditional execution, we cannot back up the + live information so easily, since the conditional + death data structures are not so self-contained. + So record that we've made a modification to this + block and update life information at the end. */ + SET_BIT (blocks, bb->index); + changed = true; + + for (i = 0; i < MAX_INSNS_PER_PEEP2 + 1; ++i) + peep2_insn_data[i].insn = NULL_RTX; + peep2_insn_data[peep2_current].insn = PEEP2_EOB; + peep2_current_count = 0; +#else + /* Back up lifetime information past the end of the + newly created sequence. */ + if (++i >= MAX_INSNS_PER_PEEP2 + 1) + i = 0; + COPY_REG_SET (live, peep2_insn_data[i].live_before); + + /* Update life information for the new sequence. */ + x = try; + do + { + if (INSN_P (x)) + { + if (--i < 0) + i = MAX_INSNS_PER_PEEP2; + if (peep2_current_count < MAX_INSNS_PER_PEEP2 + && peep2_insn_data[i].insn == NULL_RTX) + peep2_current_count++; + peep2_insn_data[i].insn = x; + propagate_one_insn (pbi, x); + COPY_REG_SET (peep2_insn_data[i].live_before, live); + } + x = PREV_INSN (x); + } + while (x != prev); + + /* ??? Should verify that LIVE now matches what we + had before the new sequence. */ + + peep2_current = i; +#endif + + /* If we generated a jump instruction, it won't have + JUMP_LABEL set. Recompute after we're done. */ + for (x = try; x != before_try; x = PREV_INSN (x)) + if (JUMP_P (x)) + { + do_rebuild_jump_labels = true; + break; + } + } + } + + if (insn == BB_HEAD (bb)) + break; + } + + /* Some peepholes can decide the don't need one or more of their + inputs. If this happens, local life update is not enough. */ + EXECUTE_IF_AND_COMPL_IN_BITMAP (bb->il.rtl->global_live_at_start, live, + 0, j, rsi) + { + do_global_life_update = true; + break; + } + + free_propagate_block_info (pbi); + } + + for (i = 0; i < MAX_INSNS_PER_PEEP2 + 1; ++i) + FREE_REG_SET (peep2_insn_data[i].live_before); + FREE_REG_SET (live); + + if (do_rebuild_jump_labels) + rebuild_jump_labels (get_insns ()); + + /* If we eliminated EH edges, we may be able to merge blocks. Further, + we've changed global life since exception handlers are no longer + reachable. */ + if (do_cleanup_cfg) + { + cleanup_cfg (0); + do_global_life_update = true; + } + if (do_global_life_update) + update_life_info (0, UPDATE_LIFE_GLOBAL_RM_NOTES, PROP_DEATH_NOTES); +#ifdef HAVE_conditional_execution + else + { + count_or_remove_death_notes (blocks, 1); + update_life_info (blocks, UPDATE_LIFE_LOCAL, PROP_DEATH_NOTES); + } + sbitmap_free (blocks); +#endif +} +#endif /* HAVE_peephole2 */ + +/* Common predicates for use with define_bypass. */ + +/* True if the dependency between OUT_INSN and IN_INSN is on the store + data not the address operand(s) of the store. IN_INSN must be + single_set. OUT_INSN must be either a single_set or a PARALLEL with + SETs inside. */ + +int +store_data_bypass_p (rtx out_insn, rtx in_insn) +{ + rtx out_set, in_set; + + in_set = single_set (in_insn); + gcc_assert (in_set); + + if (!MEM_P (SET_DEST (in_set))) + return false; + + out_set = single_set (out_insn); + if (out_set) + { + if (reg_mentioned_p (SET_DEST (out_set), SET_DEST (in_set))) + return false; + } + else + { + rtx out_pat; + int i; + + out_pat = PATTERN (out_insn); + gcc_assert (GET_CODE (out_pat) == PARALLEL); + + for (i = 0; i < XVECLEN (out_pat, 0); i++) + { + rtx exp = XVECEXP (out_pat, 0, i); + + if (GET_CODE (exp) == CLOBBER) + continue; + + gcc_assert (GET_CODE (exp) == SET); + + if (reg_mentioned_p (SET_DEST (exp), SET_DEST (in_set))) + return false; + } + } + + return true; +} + +/* True if the dependency between OUT_INSN and IN_INSN is in the IF_THEN_ELSE + condition, and not the THEN or ELSE branch. OUT_INSN may be either a single + or multiple set; IN_INSN should be single_set for truth, but for convenience + of insn categorization may be any JUMP or CALL insn. */ + +int +if_test_bypass_p (rtx out_insn, rtx in_insn) +{ + rtx out_set, in_set; + + in_set = single_set (in_insn); + if (! in_set) + { + gcc_assert (JUMP_P (in_insn) || CALL_P (in_insn)); + return false; + } + + if (GET_CODE (SET_SRC (in_set)) != IF_THEN_ELSE) + return false; + in_set = SET_SRC (in_set); + + out_set = single_set (out_insn); + if (out_set) + { + if (reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 1)) + || reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 2))) + return false; + } + else + { + rtx out_pat; + int i; + + out_pat = PATTERN (out_insn); + gcc_assert (GET_CODE (out_pat) == PARALLEL); + + for (i = 0; i < XVECLEN (out_pat, 0); i++) + { + rtx exp = XVECEXP (out_pat, 0, i); + + if (GET_CODE (exp) == CLOBBER) + continue; + + gcc_assert (GET_CODE (exp) == SET); + + if (reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 1)) + || reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 2))) + return false; + } + } + + return true; +} + +static bool +gate_handle_peephole2 (void) +{ + return (optimize > 0 && flag_peephole2); +} + +static unsigned int +rest_of_handle_peephole2 (void) +{ +#ifdef HAVE_peephole2 + peephole2_optimize (); +#endif + return 0; +} + +struct tree_opt_pass pass_peephole2 = +{ + "peephole2", /* name */ + gate_handle_peephole2, /* gate */ + rest_of_handle_peephole2, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_PEEPHOLE2, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func, /* todo_flags_finish */ + 'z' /* letter */ +}; + +static unsigned int +rest_of_handle_split_all_insns (void) +{ + split_all_insns (1); + return 0; +} + +struct tree_opt_pass pass_split_all_insns = +{ + "split1", /* name */ + NULL, /* gate */ + rest_of_handle_split_all_insns, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + 0, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func, /* todo_flags_finish */ + 0 /* letter */ +}; + +/* The placement of the splitting that we do for shorten_branches + depends on whether regstack is used by the target or not. */ +static bool +gate_do_final_split (void) +{ +#if defined (HAVE_ATTR_length) && !defined (STACK_REGS) + return 1; +#else + return 0; +#endif +} + +struct tree_opt_pass pass_split_for_shorten_branches = +{ + "split3", /* name */ + gate_do_final_split, /* gate */ + split_all_insns_noflow, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_SHORTEN_BRANCH, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func, /* todo_flags_finish */ + 0 /* letter */ +}; + + +static bool +gate_handle_split_before_regstack (void) +{ +#if defined (HAVE_ATTR_length) && defined (STACK_REGS) + /* If flow2 creates new instructions which need splitting + and scheduling after reload is not done, they might not be + split until final which doesn't allow splitting + if HAVE_ATTR_length. */ +# ifdef INSN_SCHEDULING + return (optimize && !flag_schedule_insns_after_reload); +# else + return (optimize); +# endif +#else + return 0; +#endif +} + +struct tree_opt_pass pass_split_before_regstack = +{ + "split2", /* name */ + gate_handle_split_before_regstack, /* gate */ + rest_of_handle_split_all_insns, /* execute */ + NULL, /* sub */ + NULL, /* next */ + 0, /* static_pass_number */ + TV_SHORTEN_BRANCH, /* tv_id */ + 0, /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_dump_func, /* todo_flags_finish */ + 0 /* letter */ +}; |