https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114319
--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:74bca21db31e3f4ab6543b56c3f26b4dfe586fef commit r14-9453-g74bca21db31e3f4ab6543b56c3f26b4dfe586fef Author: Jakub Jelinek <ja...@redhat.com> Date: Wed Mar 13 15:34:59 2024 +0100 store-merging: Match bswap64 on 32-bit targets with bswapsi2 [PR114319] gimple-ssa-store-merging.cc tests bswap_optab in 3 different places, in 2 of them it has special exception for double-word bswap using pair of word-mode bswap optabs, but in the last one it doesn't. The following patch changes even the last spot. We don't handle 128-bit bswaps in the passes at all, because currently we just use uint64_t to represent the byte reshuffling (we'd need to use offset_int or something like that instead) and we don't have __builtin_bswap128 nor type-generic __builtin_bswap, so there is nothing for 64-bit targets there. 2024-03-13 Jakub Jelinek <ja...@redhat.com> PR middle-end/114319 * gimple-ssa-store-merging.cc (imm_store_chain_info::try_coalesce_bswap): For 32-bit targets allow matching __builtin_bswap64 if there is bswapsi2 optab. * gcc.target/i386/pr114319.c: New test.
