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| author | sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-07-04 14:57:34 +0000 |
|---|---|---|
| committer | sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-07-04 14:57:34 +0000 |
| commit | 29852f1d5ac8757447e463d069fc2ff2aefa0f52 (patch) | |
| tree | ba38aba87ed659ac926481e89ea08559f6c2b97f /gcc/ifcvt.c | |
| parent | d80efa726fcb355ff6a45acc49b4142c87fe41b9 (diff) | |
| download | gcc-29852f1d5ac8757447e463d069fc2ff2aefa0f52.tar.gz | |
* ifcvt.c (noce_try_sign_mask): Call emit_store_flag to generate
a "sign mask" instead of using ashr_optab directly.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@84081 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/ifcvt.c')
| -rw-r--r-- | gcc/ifcvt.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c index bd4c30c00ac..0be64727d35 100644 --- a/gcc/ifcvt.c +++ b/gcc/ifcvt.c @@ -1735,8 +1735,10 @@ noce_try_sign_mask (struct noce_if_info *if_info) return FALSE; start_sequence (); - c = gen_int_mode (GET_MODE_BITSIZE (mode) - 1, mode); - m = expand_binop (mode, ashr_optab, m, c, NULL_RTX, 0, OPTAB_DIRECT); + /* Use emit_store_flag to generate "m < 0 ? -1 : 0" instead of expanding + "(signed) m >> 31" directly. This benefits targets with specialized + insns to obtain the signmask, but still uses ashr_optab otherwise. */ + m = emit_store_flag (gen_reg_rtx (mode), LT, m, const0_rtx, mode, 0, -1); t = m ? expand_binop (mode, and_optab, m, t, NULL_RTX, 0, OPTAB_DIRECT) : NULL_RTX; |