https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117173
--- Comment #8 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Robin Dapp <rd...@gcc.gnu.org>: https://gcc.gnu.org/g:006b4e45f3ab169a47146b31d9721c79098236ac commit r15-7235-g006b4e45f3ab169a47146b31d9721c79098236ac Author: Robin Dapp <rd...@ventanamicro.com> Date: Thu Oct 17 18:39:16 2024 +0200 RISC-V: Disable two-source permutes for now [PR117173]. After testing on the BPI (4.2% improvement for x264 input 1, 4.4% for input 2) and the discussion in PR117173 I figured it's best to disable the two-source permutes by default for now. The patch adds a parameter "riscv-two-source-permutes" which restores the old behavior. PR target/117173 gcc/ChangeLog: * config/riscv/riscv-v.cc (shuffle_generic_patterns): Only support single-source permutes by default. * config/riscv/riscv.opt: New param "riscv-two-source-permutes". gcc/testsuite/ChangeLog: * gcc.dg/fold-perm-2.c: Run with two-source permutes. * gcc.dg/pr54346.c: Ditto.
