https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104639
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The #c5 case seems unrelated and started with r12-5358-g32221357007666124409ec3ee0d3a1cf263ebc9e Please file a separate PR for that.
[Bug tree-optimization/104639] [12 Regression] Useless loop not fully optimized anymore
jakub at gcc dot gnu.org via Gcc-bugs Tue, 22 Feb 2022 10:06:33 -0800
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