https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107717
--- Comment #2 from CVS 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:cbe313060cdcf1d857d42a9e16a1a03e5ff89fff commit r13-4123-gcbe313060cdcf1d857d42a9e16a1a03e5ff89fff Author: Tamar Christina <tamar.christ...@arm.com> Date: Thu Nov 17 08:20:59 2022 +0000 middle-end: ensure that VEC_PERM operands get lowered to the same SSA_NAME. [PR107717] At the moment when the VEC_PERMs generated by this match.pd rule is generated it creates two different SSA_NAMEs for the folded operand. Because of this it the permute switches from a single operand permute to a two operand permute and the target may no longer support a permute for this. This fixes it by ensuring we generate the same SSA_NAME for both operands. gcc/ChangeLog: PR tree-optimization/107717 * match.pd: Ensure same SSA_NAME. gcc/testsuite/ChangeLog: PR tree-optimization/107717 * gcc.target/aarch64/sve2/pr107717.c: New test.
