https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86844
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Author: jakub Date: Wed Sep 12 09:25:07 2018 New Revision: 264232 URL: https://gcc.gnu.org/viewcvs?rev=264232&root=gcc&view=rev Log: PR tree-optimization/86844 * gimple-ssa-store-merging.c (imm_store_chain_info::coalesce_immediate): For overlapping stores, if there are any overlapping stores in between them, make sure they are also coalesced or we give up completely. * gcc.c-torture/execute/pr86844.c: New test. * gcc.dg/store_merging_22.c: New test. * gcc.dg/store_merging_23.c: New test. Added: trunk/gcc/testsuite/gcc.c-torture/execute/pr86844.c trunk/gcc/testsuite/gcc.dg/store_merging_22.c trunk/gcc/testsuite/gcc.dg/store_merging_23.c Modified: trunk/gcc/ChangeLog trunk/gcc/gimple-ssa-store-merging.c trunk/gcc/testsuite/ChangeLog