https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117012
--- Comment #8 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Tamar Christina <tnfch...@gcc.gnu.org>: https://gcc.gnu.org/g:be966baa353dfcc20b76b5a5586ab2494bb0a735 commit r15-4327-gbe966baa353dfcc20b76b5a5586ab2494bb0a735 Author: Tamar Christina <tamar.christ...@arm.com> Date: Mon Oct 14 14:00:25 2024 +0100 simplify-rtx: Fix incorrect folding of shift and AND [PR117012] The optimization added in r15-1047-g7876cde25cbd2f is using the wrong operaiton to check for uniform constant vectors. The Author intended to check that all the lanes in the vector are the same and so used CONST_VECTOR_DUPLICATE_P. However this only checks that the vector is created from a pattern duplication, but doesn't say how many pattern alternatives make up the duplication. Normally would would need to check this separately or use const_vec_duplicate_p. Without this the optimization incorrectly triggers. gcc/ChangeLog: PR rtl-optimization/117012 * simplify-rtx.cc (simplify_context::simplify_binary_operation_1): Use const_vec_duplicate_p instead of CONST_VECTOR_DUPLICATE_P. gcc/testsuite/ChangeLog: PR rtl-optimization/117012 * gcc.target/aarch64/pr117012.c: New test.
