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| author | Jakub Jelinek <jakub@redhat.com> | 2011-12-05 21:56:14 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2011-12-05 21:56:14 +0100 |
| commit | 0fb808ea7a0f30531e9a1495b9aafa5267c2f0b5 (patch) | |
| tree | ee9328a0873b74fdcbd5ebe510e67699561cd4bf /gcc/tree-ssa-math-opts.c | |
| parent | 17fe0fdbad5fd777bbfa62b44cd97becb5f72056 (diff) | |
| download | gcc-0fb808ea7a0f30531e9a1495b9aafa5267c2f0b5.zip gcc-0fb808ea7a0f30531e9a1495b9aafa5267c2f0b5.tar.gz gcc-0fb808ea7a0f30531e9a1495b9aafa5267c2f0b5.tar.bz2 | |
re PR tree-optimization/51396 (ICE: verify_flow_info failed: BB 4 can not throw but has an EH edge with -O2 -fnon-call-exceptions -mfma4)
PR tree-optimization/51396
* tree-ssa-math-opts.c (convert_mult_to_fma): Don't optimize
if MUL_RESULT has zero uses.
* g++.dg/opt/pr51396.C: New test.
From-SVN: r182028
Diffstat (limited to 'gcc/tree-ssa-math-opts.c')
| -rw-r--r-- | gcc/tree-ssa-math-opts.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/tree-ssa-math-opts.c b/gcc/tree-ssa-math-opts.c index 75abb336..06a4505 100644 --- a/gcc/tree-ssa-math-opts.c +++ b/gcc/tree-ssa-math-opts.c @@ -2429,6 +2429,12 @@ convert_mult_to_fma (gimple mul_stmt, tree op1, tree op2) if (optab_handler (fma_optab, TYPE_MODE (type)) == CODE_FOR_nothing) return false; + /* If the multiplication has zero uses, it is kept around probably because + of -fnon-call-exceptions. Don't optimize it away in that case, + it is DCE job. */ + if (has_zero_uses (mul_result)) + return false; + /* Make sure that the multiplication statement becomes dead after the transformation, thus that all uses are transformed to FMAs. This means we assume that an FMA operation has the same cost |