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| author | Richard Biener <rguenther@suse.de> | 2023-01-25 13:31:46 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2023-01-25 13:37:23 +0100 |
| commit | c29d85359add807200a1a851026b4e4a9d6b714c (patch) | |
| tree | 145ca6779497b995647b3e4786414b3df9406b5a /gcc/gcc.cc | |
| parent | 64f66385086e6a957c337eef97aec01cf30c162d (diff) | |
| download | gcc-c29d85359add807200a1a851026b4e4a9d6b714c.zip gcc-c29d85359add807200a1a851026b4e4a9d6b714c.tar.gz gcc-c29d85359add807200a1a851026b4e4a9d6b714c.tar.bz2 | |
tree-optimization/108523 - fix endless iteration in VN
The following fixes not converging iteration in value-numbering of
PHI nodes when we use an equivalence to prove the PHI node is
degenerate. We have to avoid the situation where we oscillate
between the two equivalent values because the result is fed back
via a backedge.
PR tree-optimization/108523
* tree-ssa-sccvn.cc (visit_phi): Avoid using the exclusive
backedge value for the result when using predication to
prove equivalence.
Diffstat (limited to 'gcc/gcc.cc')
0 files changed, 0 insertions, 0 deletions