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| author | Michael Matz <matz@suse.de> | 2010-09-08 12:34:52 +0000 |
|---|---|---|
| committer | Michael Matz <matz@gcc.gnu.org> | 2010-09-08 12:34:52 +0000 |
| commit | 3834917dbfa662ad3c358508dc40e3b7f4c70182 (patch) | |
| tree | 40333867cd2cdc114ffbe072682c1206a8847164 /gcc/tree-ssa-sink.c | |
| parent | b5c878a5159f7d60f0c451b25888bcb2af4025e5 (diff) | |
| download | gcc-3834917dbfa662ad3c358508dc40e3b7f4c70182.zip gcc-3834917dbfa662ad3c358508dc40e3b7f4c70182.tar.gz gcc-3834917dbfa662ad3c358508dc40e3b7f4c70182.tar.bz2 | |
re PR tree-optimization/33244 (Missed opportunities for vectorization)
PR tree-optimization/33244
* tree-ssa-sink.c (statement_sink_location): Don't sink into
empty loop latches.
testsuite/
PR tree-optimization/33244
* gfortran.dg/vect/fast-math-vect-8.f90: New test.
From-SVN: r163998
Diffstat (limited to 'gcc/tree-ssa-sink.c')
| -rw-r--r-- | gcc/tree-ssa-sink.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/tree-ssa-sink.c b/gcc/tree-ssa-sink.c index 436047b..bfa1a31 100644 --- a/gcc/tree-ssa-sink.c +++ b/gcc/tree-ssa-sink.c @@ -429,6 +429,12 @@ statement_sink_location (gimple stmt, basic_block frombb, || sinkbb->loop_father != frombb->loop_father) return false; + /* If the latch block is empty, don't make it non-empty by sinking + something into it. */ + if (sinkbb == frombb->loop_father->latch + && empty_block_p (sinkbb)) + return false; + /* Move the expression to a post dominator can't reduce the number of executions. */ if (dominated_by_p (CDI_POST_DOMINATORS, frombb, sinkbb)) |