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| author | Richard Biener <rguenther@suse.de> | 2021-05-10 11:37:27 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2021-05-10 13:05:58 +0200 |
| commit | 60af2db18013a0339302928ba98fee893ccc1957 (patch) | |
| tree | 88a9e0c0e46e838e441917a516385ce5a032ff33 /contrib/gcc-changelog/git_commit.py | |
| parent | cc1d563887b1fe3183a21572b2ea63466b2bfa3a (diff) | |
| download | gcc-60af2db18013a0339302928ba98fee893ccc1957.zip gcc-60af2db18013a0339302928ba98fee893ccc1957.tar.gz gcc-60af2db18013a0339302928ba98fee893ccc1957.tar.bz2 | |
tree-optimization/100492 - avoid irreducible regions in loop distribution
When we distribute away a condition we rely on the ability to
change it to either 1 != 0 or 0 != 0 depending on the direction
of the exit branch in the respective loop. But when the loop
contains an irreducible sub-region then for the conditions inside
this this fails and can lead to infinite loops being generated.
Avoid distibuting loops with irreducible sub-regions.
2021-05-10 Richard Biener <rguenther@suse.de>
PR tree-optimization/100492
* tree-loop-distribution.c (find_seed_stmts_for_distribution):
Find nothing when the loop contains an irreducible region.
* gcc.dg/torture/pr100492.c: New testcase.
Diffstat (limited to 'contrib/gcc-changelog/git_commit.py')
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