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| author | Roger Sayle <roger@eyesopen.com> | 2004-07-04 14:57:34 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2004-07-04 14:57:34 +0000 |
| commit | b75941cbaa3e704709f1985169405d3e6efd9392 (patch) | |
| tree | ba38aba87ed659ac926481e89ea08559f6c2b97f /gcc | |
| parent | a09d4744294e28a19e7f785e85a361d2cd34c25e (diff) | |
| download | gcc-b75941cbaa3e704709f1985169405d3e6efd9392.zip gcc-b75941cbaa3e704709f1985169405d3e6efd9392.tar.gz gcc-b75941cbaa3e704709f1985169405d3e6efd9392.tar.bz2 | |
ifcvt.c (noce_try_sign_mask): Call emit_store_flag to generate a "sign mask" instead of using ashr_optab directly.
* ifcvt.c (noce_try_sign_mask): Call emit_store_flag to generate
a "sign mask" instead of using ashr_optab directly.
From-SVN: r84081
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/ifcvt.c | 6 |
2 files changed, 9 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 5f635ca..5ab3fee 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2004-07-04 Roger Sayle <roger@eyesopen.com> + + * ifcvt.c (noce_try_sign_mask): Call emit_store_flag to generate + a "sign mask" instead of using ashr_optab directly. + 2004-07-04 Neil Booth <neil@duron.akihabara.co.uk> * doc/cpp.texi: Don't document what we do for ill-formed expressions. diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c index bd4c30c..0be6472 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; |