https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104882
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Christophe Lyon <cl...@gcc.gnu.org>: https://gcc.gnu.org/g:3ab5c8cd03d92bf4ec41e351820349d92fbc40c4 commit r12-7818-g3ab5c8cd03d92bf4ec41e351820349d92fbc40c4 Author: Christophe Lyon <christophe.l...@arm.com> Date: Fri Mar 18 08:30:00 2022 +0000 arm: Revert Auto-vectorization for MVE: add pack/unpack patterns PR target/104882 This reverts commit r12-1434-g046a3beb1673bf to fix PR target/104882. As discussed in the PR, it turns out that the MVE ISA has no natural mapping with GCC's vec_pack_trunc / vec_unpack standard patterns, unlike Neon or SVE for instance. This patch also adds the executable testcase provided in the PR. This test passes at -O3 because the generated code does not need to use the pack/unpack patterns, hence the use of -O2 which now triggers vectorization since a few months ago. 2022-03-18 Christophe Lyon <christohe.l...@arm.com> PR target/104882 Revert 2021-06-11 Christophe Lyon <christophe.l...@linaro.org> gcc/ * config/arm/mve.md (mve_vec_unpack<US>_lo_<mode>): Delete. (mve_vec_unpack<US>_hi_<mode>): Delete. (@mve_vec_pack_trunc_lo_<mode>): Delete. (mve_vmovntq_<supf><mode>): Remove '@' prefix. * config/arm/neon.md (vec_unpack<US>_hi_<mode>): Move back from vec-common.md. (vec_unpack<US>_lo_<mode>): Likewise. (vec_pack_trunc_<mode>): Rename from neon_quad_vec_pack_trunc_<mode>. * config/arm/vec-common.md (vec_unpack<US>_hi_<mode>): Delete. (vec_unpack<US>_lo_<mode>): Delete. (vec_pack_trunc_<mode>): Delete. PR target/104882 gcc/testsuite/ * gcc.target/arm/simd/mve-vclz.c: Update expected results. * gcc.target/arm/simd/mve-vshl.c: Likewise. * gcc.target/arm/simd/mve-vec-pack.c: Delete. * gcc.target/arm/simd/mve-vec-unpack.c: Delete. * gcc.target/arm/simd/pr104882.c: New test.
