https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106601
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:e5e6983c3da53729e58a32af1d531ea74b3dbf5d commit r13-2179-ge5e6983c3da53729e58a32af1d531ea74b3dbf5d Author: Andrew Pinski <apin...@marvell.com> Date: Fri Aug 19 17:46:40 2022 +0000 Fix PR 106601: __builtin_bswap16 code gen could be improved with ZBB enabled The default expansion for bswap16 is two extractions (shift/and) followed by an insertation (ior) and then a zero extend. This can be improved with ZBB enabled to just full byteswap followed by a (logical) shift right. This patch adds a new pattern for this which does that. OK? Built and tested on riscv32-linux-gnu and riscv64-linux-gnu. gcc/ChangeLog: PR target/106601 * config/riscv/bitmanip.md (bswaphi2): New pattern. gcc/testsuite/ChangeLog: PR target/106601 * gcc.target/riscv/zbb_32_bswap-2.c: New test. * gcc.target/riscv/zbb_bswap-2.c: New test.
