https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113860
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Pengxuan Zheng <pzh...@gcc.gnu.org>: https://gcc.gnu.org/g:e4b8db26de35239bd621aad9c0361f25d957122b commit r15-2659-ge4b8db26de35239bd621aad9c0361f25d957122b Author: Pengxuan Zheng <quic_pzh...@quicinc.com> Date: Wed Jul 31 17:00:01 2024 -0700 aarch64: Improve Advanced SIMD popcount expansion by using SVE [PR113860] This patch improves the Advanced SIMD popcount expansion by using SVE if available. For example, GCC currently generates the following code sequence for V2DI: cnt v31.16b, v31.16b uaddlp v31.8h, v31.16b uaddlp v31.4s, v31.8h uaddlp v31.2d, v31.4s However, by using SVE, we can generate the following sequence instead: ptrue p7.b, all cnt z31.d, p7/m, z31.d Similar improvements can be made for V4HI, V8HI, V2SI and V4SI too. The scalar popcount expansion can also be improved similarly by using SVE and those changes will be included in a separate patch. PR target/113860 gcc/ChangeLog: * config/aarch64/aarch64-simd.md (popcount<mode>2): Add TARGET_SVE support. * config/aarch64/aarch64-sve.md (@aarch64_pred_<optab><mode>): Use new iterator SVE_VDQ_I. * config/aarch64/iterators.md (SVE_VDQ_I): New mode iterator. (VPRED): Add V8QI, V16QI, V4HI, V8HI and V2SI. gcc/testsuite/ChangeLog: * gcc.target/aarch64/popcnt-sve.c: New test. Signed-off-by: Pengxuan Zheng <quic_pzh...@quicinc.com>
