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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/toplev.c | |
| 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/toplev.c')
| -rw-r--r-- | gcc/toplev.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/toplev.c b/gcc/toplev.c index 05e753a..4d16201 100644 --- a/gcc/toplev.c +++ b/gcc/toplev.c @@ -2902,6 +2902,13 @@ rest_of_handle_cse2 (tree decl, rtx insns) dump_flow_info (rtl_dump_file); /* CFG is no longer maintained up-to-date. */ tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file); + + /* Run a pass to eliminate duplicated assignments to condition code + registers. We have to run this after bypass_jumps, because it + makes it harder for that pass to determine whether a jump can be + bypassed safely. */ + cse_condition_code_reg (); + purge_all_dead_edges (0); delete_trivially_dead_insns (insns, max_reg_num ()); |