[Bug target/113609] EQ/NE comparison between avx512 kmask and -1 can be optimized with kxortest with checking CF.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113609 Hongtao Liu changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution|---

[Bug target/113609] EQ/NE comparison between avx512 kmask and -1 can be optimized with kxortest with checking CF.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113609 --- Comment #3 from GCC Commits --- The master branch has been updated by Hu : https://gcc.gnu.org/g:bf7745f887c765e06f2e75508f263debb60aeb2e commit r15-974-gbf7745f887c765e06f2e75508f263debb60aeb2e Author: Hu, Lin1 Date: Thu May 9

[Bug target/113609] EQ/NE comparison between avx512 kmask and -1 can be optimized with kxortest with checking CF.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113609 --- Comment #2 from Uroš Bizjak --- (In reply to Hongtao Liu from comment #1) > Since they're different modes, CCZ for cmp, but CCS for kortest, it could be > diffcult to optimize it in RA stage by adding alternatives(like we did for > compared

[Bug target/113609] EQ/NE comparison between avx512 kmask and -1 can be optimized with kxortest with checking CF.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113609 --- Comment #1 from Hongtao Liu --- Since they're different modes, CCZ for cmp, but CCS for kortest, it could be diffcult to optimize it in RA stage by adding alternatives(like we did for compared to 0). So the easy way could be adding peephole