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| author | Richard Biener <rguenther@suse.de> | 2020-10-20 13:15:45 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2020-10-20 14:21:01 +0200 |
| commit | 06729598b0dc10dbe60545f21c2214ad66a5a3db (patch) | |
| tree | 71ae624c85726b68eb0612d859402931906cc7b1 /gcc | |
| parent | 1bfc07d150790fae93184a79a7cce897655cb37b (diff) | |
| download | gcc-06729598b0dc10dbe60545f21c2214ad66a5a3db.zip gcc-06729598b0dc10dbe60545f21c2214ad66a5a3db.tar.gz gcc-06729598b0dc10dbe60545f21c2214ad66a5a3db.tar.bz2 | |
Fix latch PHI arg lookup in vectorizable_reduction for double-reduction
We were using the wrong loop to figure the latch arg of a
double-reduction PHI. Which isn't a problem in case ->dest_idx
match up with the outer loop edges - but that's of course not guaranteed.
2020-10-20 Richard Biener <rguenther@suse.de>
* tree-vect-loop.c (vectorizable_reduction): Use the correct
loops latch edge for the PHI arg lookup.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/tree-vect-loop.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c index 991fd45..6c29e00 100644 --- a/gcc/tree-vect-loop.c +++ b/gcc/tree-vect-loop.c @@ -6359,8 +6359,10 @@ vectorizable_reduction (loop_vec_info loop_vinfo, /* Verify following REDUC_IDX from the latch def leads us back to the PHI and compute the reduction chain length. Discover the real reduction operation stmt on the way (stmt_info and slp_for_stmt_info). */ - tree reduc_def = PHI_ARG_DEF_FROM_EDGE (reduc_def_phi, - loop_latch_edge (loop)); + tree reduc_def + = PHI_ARG_DEF_FROM_EDGE (reduc_def_phi, + loop_latch_edge + (gimple_bb (reduc_def_phi)->loop_father)); unsigned reduc_chain_length = 0; bool only_slp_reduc_chain = true; stmt_info = NULL; |