diff options
| author | Richard Biener <rguenther@suse.de> | 2015-02-18 13:08:58 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2015-02-18 13:08:58 +0000 |
| commit | 8039a35df1ddf6a7ff4a77396f283547c145aa84 (patch) | |
| tree | 3777ceaf738435971495c600f1c05fc340338271 /gcc/tree-predcom.c | |
| parent | 0c28944fc0afabc39bf675723e2021e306973624 (diff) | |
re PR tree-optimization/65063 (gcc.dg/vect/vect-double-reduc-6.c FAILs with -O3 -fno-tree-loop-ivcanon -fno-tree-vectorize)
2015-02-18 Richard Biener <rguenther@suse.de>
PR tree-optimization/65063
* tree-predcom.c (determine_unroll_factor): Return 1 if we
have replaced looparound PHIs.
* gcc.dg/pr65063.c: New testcase.
From-SVN: r220788
Diffstat (limited to 'gcc/tree-predcom.c')
| -rw-r--r-- | gcc/tree-predcom.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/gcc/tree-predcom.c b/gcc/tree-predcom.c index 8dac1ba5afd..03a38b4de84 100644 --- a/gcc/tree-predcom.c +++ b/gcc/tree-predcom.c @@ -1775,9 +1775,21 @@ determine_unroll_factor (vec<chain_p> chains) FOR_EACH_VEC_ELT (chains, i, chain) { - if (chain->type == CT_INVARIANT || chain->combined) + if (chain->type == CT_INVARIANT) continue; + if (chain->combined) + { + /* For combined chains, we can't handle unrolling if we replace + looparound PHIs. */ + dref a; + unsigned j; + for (j = 1; chain->refs.iterate (j, &a); j++) + if (gimple_code (a->stmt) == GIMPLE_PHI) + return 1; + continue; + } + /* The best unroll factor for this chain is equal to the number of temporary variables that we create for it. */ af = chain->length; |