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| author | Carrot Wei <carrot@google.com> | 2014-05-15 10:06:33 +0800 |
|---|---|---|
| committer | Andrew Hsieh <andrewhsieh@google.com> | 2014-05-15 15:59:04 +0800 |
| commit | 331e362574142e4c1d9d509533d1c96b6dc54d13 (patch) | |
| tree | b078d9e04e3437c2d322b4d3406fedc973833440 /gcc-4.9/gcc/target.def | |
| parent | 5cd97bdbf2d97af4b0e4301f5f2b6c2a4301baf9 (diff) | |
| download | toolchain_gcc-331e362574142e4c1d9d509533d1c96b6dc54d13.tar.gz toolchain_gcc-331e362574142e4c1d9d509533d1c96b6dc54d13.tar.bz2 toolchain_gcc-331e362574142e4c1d9d509533d1c96b6dc54d13.zip | |
[4.8, 4.9] Add simplify-got
This pass optimize GOT_PREL (already exists in toolchain/gcc/gcc-4.6)
Backport from svn://gcc.gnu.org/svn/gcc/branches/google/gcc-4_6-mobile
UNSPEC_GOT_PREL_SYM is now in new file arm/unspecs.md
4.9 port is slightly different due to changes in gcc passes
See Google b/14811006
r173209 | carrot | 2011-04-30 16:07:46 +0800 (Sat, 30 Apr 2011) | 21 lines
* hooks.c (hook_rtx_void_null): New function.
* hooks.h (hook_rtx_void_null): New prototype.
* target.def (got_access): New hook vector declaration.
* tree-pass.h (pass_simplify_got): New pass.
* timevar.def (TV_SIMPLIFY_GOT): New TV id.
* simplify-got.c: New source file.
* Makefile.in (simplify-got.o): Add a new file.
* passes.c (init_optimization_passes): Add a new pass.
* config/arm/arm.c (arm_output_addr_const_extra): Output GOT_PREL
relocation.
(arm_get_pic_reg): New function.
(arm_clear_pic_reg): New function.
(arm_can_simplify_got_access): New function.
(arm_loaded_global_var): New function.
(arm_load_global_address): New function.
* config/arm/arm.md (UNSPEC_GOT_PREL_SYM): New UNSPEC symbol.
* testsuite/gcc.target/arm/got1.c: New testcase.
* testsuite/gcc.target/arm/got2.c: New testcase.
Change-Id: I91e881df19bb6937a5fbcc8e6b83d158717c7773
Diffstat (limited to 'gcc-4.9/gcc/target.def')
| -rw-r--r-- | gcc-4.9/gcc/target.def | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/target.def b/gcc-4.9/gcc/target.def index 3a64cd143..a67ffa8b5 100644 --- a/gcc-4.9/gcc/target.def +++ b/gcc-4.9/gcc/target.def @@ -5116,6 +5116,51 @@ specific target options and the caller does not use the same options.", HOOK_VECTOR_END (target_option) +/* Functions used to simplify GOT access. */ +#undef HOOK_PREFIX +#define HOOK_PREFIX "TARGET_" +HOOK_VECTOR (TARGET_SIMPLIFY_GOT_ACCESS, simplify_got_access) + +/* Function to get the pic_reg which holds the base address of GOT. */ +DEFHOOK +(get_pic_reg, + "", + rtx, (void), + hook_rtx_void_null) + +/* Function to clear the pic_reg which is useless now. */ +DEFHOOK +(clear_pic_reg, + "", + void, (void), + NULL) + +/* Function to detect if the specified insn loads a global variable's + address from GOT. If so returns that symbol. */ +DEFHOOK +(loaded_global_var, + "", + rtx, (rtx insn, rtx *offset_reg, rtx *offset_insn), + NULL) + +/* This function checks if it satisfies the target dependent conditions + that we can simplify GOT accesses. */ +DEFHOOK +(can_simplify_got_access, + "", + bool, (int n_symbol, int n_access), + NULL) + +/* This function does the actual rewriting of GOT accesses. */ +DEFHOOK +(load_global_address, + "", + void, (rtx symbol, rtx offset_reg, rtx address_reg, rtx load_insn, + rtx offset_insn), + NULL) + +HOOK_VECTOR_END (got_access) + /* For targets that need to mark extra registers as live on entry to the function, they should define this target hook and set their bits in the bitmap passed in. */ |