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| author | Ian Lance Taylor <ian@wasabisystems.com> | 2004-01-23 21:05:21 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2004-01-23 21:05:21 +0000 |
| commit | e129d93a7b1eda6ee734fff7aa1f8bc60e5ba7e2 (patch) | |
| tree | 1957c990b77f48c80e149663c064a9f71d8e783a /gcc/target.h | |
| parent | f6c930a38a5633c4880f572feaddfce14b45951b (diff) | |
| download | gcc-e129d93a7b1eda6ee734fff7aa1f8bc60e5ba7e2.zip gcc-e129d93a7b1eda6ee734fff7aa1f8bc60e5ba7e2.tar.gz gcc-e129d93a7b1eda6ee734fff7aa1f8bc60e5ba7e2.tar.bz2 | |
re PR target/1532 (-O3 generates (obviously) redundant tests and jumps)
PR gcc/1532
* cse.c (cse_change_cc_mode): New static function.
(cse_change_cc_mode_insns, cse_cc_succs): Likewise.
(cse_condition_code_reg): New function.
* rtl.h (cse_condition_code_reg): Declare.
* toplev.c (rest_of_handle_cse2): Call cse_condition_code_reg.
* target.h (struct gcc_target): Add fixed_condition_code_regs and
cc_modes_compatible.
* target-def.h (TARGET_FIXED_CONDITION_CODE_REGS): Define.
(TARGET_CC_MODES_COMPATIBLE): Define.
(TARGET_INITIALIZER): Add new initializers.
* targhooks.c (default_cc_modes_compatible): New function.
* targhooks.c (default_cc_modes_compatible): Declare.
* hooks.c (hook_bool_intp_intp_false): New function.
* hooks.h (hook_bool_intp_intp_false): Declare.
* config/i386/i386.c (TARGET_FIXED_CONDITION_CODE_REGS): Define.
(TARGET_CC_MODES_COMPATIBLE): Define.
(ix86_fixed_condition_code_regs): New static function.
(ix86_cc_modes_compatible): Likewise.
* doc/tm.texi (Condition Code): Document new hooks.
From-SVN: r76454
Diffstat (limited to 'gcc/target.h')
| -rw-r--r-- | gcc/target.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/target.h b/gcc/target.h index 787d203..21a12f0 100644 --- a/gcc/target.h +++ b/gcc/target.h @@ -377,6 +377,23 @@ struct gcc_target hook should return NULL_RTX. */ rtx (* dwarf_register_span) (rtx); + /* Fetch the fixed register(s) which hold condition codes, for + targets where it makes sense to look for duplicate assignments to + the condition codes. This should return true if there is such a + register, false otherwise. The arguments should be set to the + fixed register numbers. Up to two condition code registers are + supported. If there is only one for this target, the int pointed + at by the second argument should be set to -1. */ + bool (* fixed_condition_code_regs) (unsigned int *, unsigned int *); + + /* If two condition code modes are compatible, return a condition + code mode which is compatible with both, such that a comparison + done in the returned mode will work for both of the original + modes. If the condition code modes are not compatible, return + VOIDmode. */ + enum machine_mode (* cc_modes_compatible) (enum machine_mode, + enum machine_mode); + /* Do machine-dependent code transformations. Called just before delayed-branch scheduling. */ void (* machine_dependent_reorg) (void); |