https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93582
--- Comment #33 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:5f9cd512c4278621435cce486dd00248ea2e821c commit r10-6885-g5f9cd512c4278621435cce486dd00248ea2e821c Author: Jakub Jelinek <ja...@redhat.com> Date: Thu Feb 27 10:12:52 2020 +0100 sccvn: Handle non-byte aligned offset or size for memset (, 123, ) [PR93945] The following is the last spot in vn_reference_lookup_3 that didn't allow non-byte aligned offsets or sizes. To be precise, it did allow size that wasn't multiple of byte size and that caused a wrong-code issue on big-endian, as the pr93945.c testcase shows, so for GCC 9 we should add && multiple_p (ref->size, BITS_PER_UNIT) check instead. For the memset with SSA_NAME middle-argument, it still requires byte-aligned offset, as we'd otherwise need to rotate the value at runtime. 2020-02-27 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/93582 PR tree-optimization/93945 * tree-ssa-sccvn.c (vn_reference_lookup_3): Handle memset with non-zero INTEGER_CST second argument and ref->offset or ref->size not a multiple of BITS_PER_UNIT. * gcc.dg/tree-ssa/pr93582-9.c: New test. * gcc.c-torture/execute/pr93945.c: New test.
