diff options
Diffstat (limited to 'binutils-2.17/gas/config/atof-vax.c')
| -rw-r--r-- | binutils-2.17/gas/config/atof-vax.c | 451 |
1 files changed, 0 insertions, 451 deletions
diff --git a/binutils-2.17/gas/config/atof-vax.c b/binutils-2.17/gas/config/atof-vax.c deleted file mode 100644 index 75756904..00000000 --- a/binutils-2.17/gas/config/atof-vax.c +++ /dev/null @@ -1,451 +0,0 @@ -/* atof_vax.c - turn a Flonum into a VAX floating point number - Copyright 1987, 1992, 1993, 1995, 1997, 1999, 2000, 2005 - Free Software Foundation, Inc. - - This file is part of GAS, the GNU Assembler. - - GAS 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. - - GAS 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 GAS; see the file COPYING. If not, write to the Free - Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA - 02110-1301, USA. */ - -#include "as.h" - -/* Precision in LittleNums. */ -#define MAX_PRECISION 8 -#define H_PRECISION 8 -#define G_PRECISION 4 -#define D_PRECISION 4 -#define F_PRECISION 2 - -/* Length in LittleNums of guard bits. */ -#define GUARD 2 - -int flonum_gen2vax (int, FLONUM_TYPE *, LITTLENUM_TYPE *); - -/* Number of chars in flonum type 'letter'. */ - -static int -atof_vax_sizeof (int letter) -{ - int return_value; - - /* Permitting uppercase letters is probably a bad idea. - Please use only lower-cased letters in case the upper-cased - ones become unsupported! */ - switch (letter) - { - case 'f': - case 'F': - return_value = 4; - break; - - case 'd': - case 'D': - case 'g': - case 'G': - return_value = 8; - break; - - case 'h': - case 'H': - return_value = 16; - break; - - default: - return_value = 0; - break; - } - - return return_value; -} - -static const long mask[] = -{ - 0x00000000, - 0x00000001, - 0x00000003, - 0x00000007, - 0x0000000f, - 0x0000001f, - 0x0000003f, - 0x0000007f, - 0x000000ff, - 0x000001ff, - 0x000003ff, - 0x000007ff, - 0x00000fff, - 0x00001fff, - 0x00003fff, - 0x00007fff, - 0x0000ffff, - 0x0001ffff, - 0x0003ffff, - 0x0007ffff, - 0x000fffff, - 0x001fffff, - 0x003fffff, - 0x007fffff, - 0x00ffffff, - 0x01ffffff, - 0x03ffffff, - 0x07ffffff, - 0x0fffffff, - 0x1fffffff, - 0x3fffffff, - 0x7fffffff, - 0xffffffff -}; - - -/* Shared between flonum_gen2vax and next_bits. */ -static int bits_left_in_littlenum; -static LITTLENUM_TYPE *littlenum_pointer; -static LITTLENUM_TYPE *littlenum_end; - -static int -next_bits (int number_of_bits) -{ - int return_value; - - if (littlenum_pointer < littlenum_end) - return 0; - if (number_of_bits >= bits_left_in_littlenum) - { - return_value = mask[bits_left_in_littlenum] & *littlenum_pointer; - number_of_bits -= bits_left_in_littlenum; - return_value <<= number_of_bits; - bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS - number_of_bits; - littlenum_pointer--; - if (littlenum_pointer >= littlenum_end) - return_value |= ((*littlenum_pointer) >> (bits_left_in_littlenum)) & mask[number_of_bits]; - } - else - { - bits_left_in_littlenum -= number_of_bits; - return_value = mask[number_of_bits] & ((*littlenum_pointer) >> bits_left_in_littlenum); - } - return return_value; -} - -static void -make_invalid_floating_point_number (LITTLENUM_TYPE *words) -{ - *words = 0x8000; /* Floating Reserved Operand Code. */ -} - - -static int /* 0 means letter is OK. */ -what_kind_of_float (int letter, /* In: lowercase please. What kind of float? */ - int *precisionP, /* Number of 16-bit words in the float. */ - long *exponent_bitsP) /* Number of exponent bits. */ -{ - int retval; - - retval = 0; - switch (letter) - { - case 'f': - *precisionP = F_PRECISION; - *exponent_bitsP = 8; - break; - - case 'd': - *precisionP = D_PRECISION; - *exponent_bitsP = 8; - break; - - case 'g': - *precisionP = G_PRECISION; - *exponent_bitsP = 11; - break; - - case 'h': - *precisionP = H_PRECISION; - *exponent_bitsP = 15; - break; - - default: - retval = 69; - break; - } - return retval; -} - -/* Warning: this returns 16-bit LITTLENUMs, because that is - what the VAX thinks in. It is up to the caller to figure - out any alignment problems and to conspire for the bytes/word - to be emitted in the right order. Bigendians beware! */ - -static char * -atof_vax (char *str, /* Text to convert to binary. */ - int what_kind, /* 'd', 'f', 'g', 'h' */ - LITTLENUM_TYPE *words) /* Build the binary here. */ -{ - FLONUM_TYPE f; - LITTLENUM_TYPE bits[MAX_PRECISION + MAX_PRECISION + GUARD]; - /* Extra bits for zeroed low-order bits. - The 1st MAX_PRECISION are zeroed, - the last contain flonum bits. */ - char *return_value; - int precision; /* Number of 16-bit words in the format. */ - long exponent_bits; - - return_value = str; - f.low = bits + MAX_PRECISION; - f.high = NULL; - f.leader = NULL; - f.exponent = 0; - f.sign = '\0'; - - if (what_kind_of_float (what_kind, &precision, &exponent_bits)) - { - return_value = NULL; - make_invalid_floating_point_number (words); - } - - if (return_value) - { - memset (bits, '\0', sizeof (LITTLENUM_TYPE) * MAX_PRECISION); - - /* Use more LittleNums than seems - necessary: the highest flonum may have - 15 leading 0 bits, so could be useless. */ - f.high = f.low + precision - 1 + GUARD; - - if (atof_generic (&return_value, ".", "eE", &f)) - { - make_invalid_floating_point_number (words); - return_value = NULL; - } - else if (flonum_gen2vax (what_kind, &f, words)) - return_value = NULL; - } - - return return_value; -} - -/* In: a flonum, a vax floating point format. - Out: a vax floating-point bit pattern. */ - -int -flonum_gen2vax (int format_letter, /* One of 'd' 'f' 'g' 'h'. */ - FLONUM_TYPE *f, - LITTLENUM_TYPE *words) /* Deliver answer here. */ -{ - LITTLENUM_TYPE *lp; - int precision; - long exponent_bits; - int return_value; /* 0 == OK. */ - - return_value = what_kind_of_float (format_letter, &precision, &exponent_bits); - - if (return_value != 0) - make_invalid_floating_point_number (words); - - else - { - if (f->low > f->leader) - /* 0.0e0 seen. */ - memset (words, '\0', sizeof (LITTLENUM_TYPE) * precision); - - else - { - long exponent_1; - long exponent_2; - long exponent_3; - long exponent_4; - int exponent_skippage; - LITTLENUM_TYPE word1; - - /* JF: Deal with new Nan, +Inf and -Inf codes. */ - if (f->sign != '-' && f->sign != '+') - { - make_invalid_floating_point_number (words); - return return_value; - } - - /* All vaxen floating_point formats (so far) have: - Bit 15 is sign bit. - Bits 14:n are excess-whatever exponent. - Bits n-1:0 (if any) are most significant bits of fraction. - Bits 15:0 of the next word are the next most significant bits. - And so on for each other word. - - All this to be compatible with a KF11?? (Which is still faster - than lots of vaxen I can think of, but it also has higher - maintenance costs ... sigh). - - So we need: number of bits of exponent, number of bits of - mantissa. */ - - bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS; - littlenum_pointer = f->leader; - littlenum_end = f->low; - /* Seek (and forget) 1st significant bit. */ - for (exponent_skippage = 0; - !next_bits (1); - exponent_skippage++);; - - exponent_1 = f->exponent + f->leader + 1 - f->low; - /* Radix LITTLENUM_RADIX, point just higher than f->leader. */ - exponent_2 = exponent_1 * LITTLENUM_NUMBER_OF_BITS; - /* Radix 2. */ - exponent_3 = exponent_2 - exponent_skippage; - /* Forget leading zeros, forget 1st bit. */ - exponent_4 = exponent_3 + (1 << (exponent_bits - 1)); - /* Offset exponent. */ - - if (exponent_4 & ~mask[exponent_bits]) - { - /* Exponent overflow. Lose immediately. */ - make_invalid_floating_point_number (words); - - /* We leave return_value alone: admit we read the - number, but return a floating exception - because we can't encode the number. */ - } - else - { - lp = words; - - /* Word 1. Sign, exponent and perhaps high bits. - Assume 2's complement integers. */ - word1 = (((exponent_4 & mask[exponent_bits]) << (15 - exponent_bits)) - | ((f->sign == '+') ? 0 : 0x8000) - | next_bits (15 - exponent_bits)); - *lp++ = word1; - - /* The rest of the words are just mantissa bits. */ - for (; lp < words + precision; lp++) - *lp = next_bits (LITTLENUM_NUMBER_OF_BITS); - - if (next_bits (1)) - { - /* Since the NEXT bit is a 1, round UP the mantissa. - The cunning design of these hidden-1 floats permits - us to let the mantissa overflow into the exponent, and - it 'does the right thing'. However, we lose if the - highest-order bit of the lowest-order word flips. - Is that clear? */ - unsigned long carry; - - /* - #if (sizeof(carry)) < ((sizeof(bits[0]) * BITS_PER_CHAR) + 2) - Please allow at least 1 more bit in carry than is in a LITTLENUM. - We need that extra bit to hold a carry during a LITTLENUM carry - propagation. Another extra bit (kept 0) will assure us that we - don't get a sticky sign bit after shifting right, and that - permits us to propagate the carry without any masking of bits. - #endif */ - for (carry = 1, lp--; - carry && (lp >= words); - lp--) - { - carry = *lp + carry; - *lp = carry; - carry >>= LITTLENUM_NUMBER_OF_BITS; - } - - if ((word1 ^ *words) & (1 << (LITTLENUM_NUMBER_OF_BITS - 1))) - { - make_invalid_floating_point_number (words); - /* We leave return_value alone: admit we read the - number, but return a floating exception - because we can't encode the number. */ - } - } - } - } - } - return return_value; -} - -/* JF this used to be in vax.c but this looks like a better place for it. */ - -/* In: input_line_pointer->the 1st character of a floating-point - number. - 1 letter denoting the type of statement that wants a - binary floating point number returned. - Address of where to build floating point literal. - Assumed to be 'big enough'. - Address of where to return size of literal (in chars). - - Out: Input_line_pointer->of next char after floating number. - Error message, or 0. - Floating point literal. - Number of chars we used for the literal. */ - -#define MAXIMUM_NUMBER_OF_LITTLENUMS 8 /* For .hfloats. */ - -char * -md_atof (int what_statement_type, - char *literalP, - int *sizeP) -{ - LITTLENUM_TYPE words[MAXIMUM_NUMBER_OF_LITTLENUMS]; - char kind_of_float; - int number_of_chars; - LITTLENUM_TYPE *littlenumP; - - switch (what_statement_type) - { - case 'F': - case 'f': - kind_of_float = 'f'; - break; - - case 'D': - case 'd': - kind_of_float = 'd'; - break; - - case 'g': - kind_of_float = 'g'; - break; - - case 'h': - kind_of_float = 'h'; - break; - - default: - kind_of_float = 0; - break; - }; - - if (kind_of_float) - { - LITTLENUM_TYPE *limit; - - input_line_pointer = atof_vax (input_line_pointer, - kind_of_float, - words); - /* The atof_vax() builds up 16-bit numbers. - Since the assembler may not be running on - a little-endian machine, be very careful about - converting words to chars. */ - number_of_chars = atof_vax_sizeof (kind_of_float); - know (number_of_chars <= MAXIMUM_NUMBER_OF_LITTLENUMS * sizeof (LITTLENUM_TYPE)); - limit = words + (number_of_chars / sizeof (LITTLENUM_TYPE)); - for (littlenumP = words; littlenumP < limit; littlenumP++) - { - md_number_to_chars (literalP, *littlenumP, sizeof (LITTLENUM_TYPE)); - literalP += sizeof (LITTLENUM_TYPE); - }; - } - else - number_of_chars = 0; - - *sizeP = number_of_chars; - return kind_of_float ? NULL : _("Bad call to md_atof()"); -} |