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| author | Richard Biener <rguenther@suse.de> | 2021-10-25 09:33:15 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2021-10-25 10:28:00 +0200 |
| commit | aa15952d646fd5dd569fce287b719a737ae66e4f (patch) | |
| tree | f0b2f3add7c2e9297845e5b19a1dd971f4211791 /gcc/tree-vect-data-refs.c | |
| parent | 7c20a9b738a2257bed4e2b0593275336d1e2047a (diff) | |
| download | gcc-aa15952d646fd5dd569fce287b719a737ae66e4f.zip gcc-aa15952d646fd5dd569fce287b719a737ae66e4f.tar.gz gcc-aa15952d646fd5dd569fce287b719a737ae66e4f.tar.bz2 | |
tree-optimization/102920 - fix PHI VN with undefined args
This fixes a latent issue exposed by now allowing VN_TOP in PHI
arguments. We may only use optimistic equality when merging values on
different edges, not when merging values on the same edge - in particular
we may not choose the undef value on any edge when there's a not undef
value as well.
2021-10-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/102920
* tree-ssa-sccvn.h (expressions_equal_p): Add argument
controlling VN_TOP matching behavior.
* tree-ssa-sccvn.c (expressions_equal_p): Likewise.
(vn_phi_eq): Do not optimistically match VN_TOP.
* gcc.dg/torture/pr102920.c: New testcase.
Diffstat (limited to 'gcc/tree-vect-data-refs.c')
0 files changed, 0 insertions, 0 deletions