https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95528
--- Comment #10 from CVS 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:8be374e02761c9d63d2753d71e4bd4874a1577b1 commit r11-1065-g8be374e02761c9d63d2753d71e4bd4874a1577b1 Author: Jakub Jelinek <ja...@redhat.com> Date: Mon Jun 8 11:05:10 2020 +0200 forwprop: Ignore scalar mode vectors in simplify_vector_constructor [PR95528] As mentioned in the PR, the problem is that at least the x86 backend asumes that the vec_unpack* and vec_pack* optabs with integral modes are for the AVX512-ish vector masks rather than for very small vectors done in GPRs. The only other target that seems to have a scalar mode vec_{,un}pack* optab is aarch64 as discussed in the PR, so there is also a condition for that. All other targets have just vector mode optabs. 2020-06-08 Jakub Jelinek <ja...@redhat.com> PR target/95528 * tree-ssa-forwprop.c (simplify_vector_constructor): Don't use VEC_UNPACK*_EXPR or VEC_PACK_TRUNC_EXPR with scalar modes unless the type is vector boolean. * g++.dg/opt/pr95528.C: New test.
