https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105668
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Roger Sayle <sa...@gcc.gnu.org>: https://gcc.gnu.org/g:793f847ba7dbe7638f1c27178868edbefd3a8108 commit r13-739-g793f847ba7dbe7638f1c27178868edbefd3a8108 Author: Roger Sayle <ro...@nextmovesoftware.com> Date: Tue May 24 15:15:12 2022 +0100 PR tree-optimization/105668: Provide vcond_mask_v1tiv1ti pattern. This patch is an alternate/supplementary fix to PR tree-optimization/105668 that provides a vcond_mask_v1titi optab/define_expand to the i386 backend. An undocumented feature/bug of GCC's vectorization is that any target that provides a vec_cmpeq<mode><mode> has to also provide a matching vcond_mask<mode><mode>. This backend patch preserves the status quo, rather than fixes the underlying problem. One aspect of this clean-up is that ix86_expand_sse_movcc provides fallback implementations using pand/pandn/por that effectively make V2DImode and V1TImode vcond_mask available on any TARGET_SSE2, not just TARGET_SSE4_2. This allows a simplification as V2DI mode can be handled by using a VI_128 mode iterator instead of a VI124_128 mode iterator, and instead this define_expand is effectively renamed to provide a V1TImode vcond_mask expander (as V1TI isn't in VI_128). 2022-05-24 Roger Sayle <ro...@nextmovesoftware.com> gcc/ChangeLog PR tree-optimization/105668 * config/i386/i386-expand.cc (ix86_expand_sse_movcc): Support V1TImode, just like V2DImode. * config/i386/sse.md (vcond_mask_<mode><sseintvecmodelower>): Use VI_128 mode iterator instead of VI124_128 to include V2DI. (vcond_mask_v2div2di): Delete. (vcond_mask_v1tiv1ti): New define_expand. gcc/testsuite/ChangeLog PR tree-optimization/105668 * gcc.target/i386/pr105668.c: New test case.
