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| author | Richard Biener <rguenther@suse.de> | 2014-03-04 08:47:55 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2014-03-04 08:47:55 +0000 |
| commit | b75f28e1aef56750fb163c3ee580474f0a0a4dc5 (patch) | |
| tree | d20b75cfb74602234e8c13fa55fab3138dcc0945 /gcc/tree-vect-loop.c | |
| parent | 03aac9ce62d5be02e786965125bcca50fe9f0106 (diff) | |
| download | gcc-b75f28e1aef56750fb163c3ee580474f0a0a4dc5.zip gcc-b75f28e1aef56750fb163c3ee580474f0a0a4dc5.tar.gz gcc-b75f28e1aef56750fb163c3ee580474f0a0a4dc5.tar.bz2 | |
re PR tree-optimization/60382 (ICE on valid code at -O3 on x86_64-linux-gnu (in vect_create_epilog_for_reduction, at tree-vect-loop.c:4352))
2014-03-04 Richard Biener <rguenther@suse.de>
PR tree-optimization/60382
* tree-vect-loop.c (vect_is_simple_reduction_1): Do not consider
dead PHIs a reduction.
* gcc.dg/vect/pr60382.c: New testcase.
From-SVN: r208305
Diffstat (limited to 'gcc/tree-vect-loop.c')
| -rw-r--r-- | gcc/tree-vect-loop.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c index 838803e..df6ab6f 100644 --- a/gcc/tree-vect-loop.c +++ b/gcc/tree-vect-loop.c @@ -2193,6 +2193,12 @@ vect_is_simple_reduction_1 (loop_vec_info loop_info, gimple phi, || (!check_reduction && flow_loop_nested_p (vect_loop, loop))); name = PHI_RESULT (phi); + /* ??? If there are no uses of the PHI result the inner loop reduction + won't be detected as possibly double-reduction by vectorizable_reduction + because that tries to walk the PHI arg from the preheader edge which + can be constant. See PR60382. */ + if (has_zero_uses (name)) + return NULL; nloop_uses = 0; FOR_EACH_IMM_USE_FAST (use_p, imm_iter, name) { |