https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94130
--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-9 branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:a545ffafa380fa958393e1dfbf7f5f8f129bc5cf commit r9-8392-ga545ffafa380fa958393e1dfbf7f5f8f129bc5cf Author: Jakub Jelinek <ja...@redhat.com> Date: Thu Mar 12 09:34:00 2020 +0100 tree-dse: Fix mem* head trimming if call has lhs [PR94130] As the testcase shows, if DSE decides to head trim {mem{set,cpy,move},strncpy} and the call has lhs, it is incorrect to leave the lhs as is, because it will then point to the adjusted address (base + head_trim) instead of the original base. The following patch fixes that by dropping the lhs of the call and assigning lhs the original base in a following statement. 2020-03-12 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/94130 * tree-ssa-dse.c: Include gimplify.h. (increment_start_addr): If stmt has lhs, drop the lhs from call and set it after the call to the original value of the first argument. Formatting fixes. (decrement_count): Formatting fix. * gcc.c-torture/execute/pr94130.c: New test.
