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| author | Jakub Jelinek <jakub@redhat.com> | 2018-03-28 21:15:39 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2018-03-28 21:15:39 +0200 |
| commit | 30a2c10eb639f1855fe7e060552f09c706efa532 (patch) | |
| tree | 707858c0b19b0db09b4434b773deb95486f2dae0 /gcc/match.pd | |
| parent | cefc09063eb4b0eb572c89c3f0657e5b5e36e77d (diff) | |
| download | gcc-30a2c10eb639f1855fe7e060552f09c706efa532.zip gcc-30a2c10eb639f1855fe7e060552f09c706efa532.tar.gz gcc-30a2c10eb639f1855fe7e060552f09c706efa532.tar.bz2 | |
re PR middle-end/82004 (SPEC CPU2017 628.pop2_s miscompare)
PR tree-optimization/82004
* gimple-match-head.c (optimize_pow_to_exp): New function.
* match.pd (pow(C,x) -> exp(log(C)*x)): Wrap with #if GIMPLE.
Don't fold to exp if optimize_pow_to_exp is false.
* gcc.dg/pr82004.c: New test.
From-SVN: r258930
Diffstat (limited to 'gcc/match.pd')
| -rw-r--r-- | gcc/match.pd | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index 3e1636c..7c4c11c 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -4006,6 +4006,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) /* pow(C,x) -> exp(log(C)*x) if C > 0, or if C is a positive power of 2, pow(C,x) -> exp2(log2(C)*x). */ +#if GIMPLE (for pows (POW) exps (EXP) logs (LOG) @@ -4035,8 +4036,10 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) } } (if (!use_exp2) - (exps (mult (logs @0) @1)) + (if (optimize_pow_to_exp (@0, @1)) + (exps (mult (logs @0) @1))) (exp2s (mult (log2s @0) @1))))))) +#endif /* pow(C,x)*expN(y) -> expN(logN(C)*x+y) if C > 0. */ (for pows (POW) |