https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87859
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Author: jakub Date: Mon Nov 5 14:12:15 2018 New Revision: 265807 URL: https://gcc.gnu.org/viewcvs?rev=265807&root=gcc&view=rev Log: PR tree-optimization/87859 * gimple-ssa-store-merging.c (struct merged_store_group): Add first_nonmergeable_order member. (merged_store_group::merged_store_group): Initialize them. (imm_store_chain_info::coalesce_immediate_stores): Don't merge stores with order >= first_nonmergeable_order. Set merged_store->first_nonmergeable_order if we've skipped any stores. Attempt to merge overlapping INTEGER_CST stores that we would otherwise skip. * gcc.dg/store_merging_24.c: New test. * gcc.dg/store_merging_25.c: New test. Added: branches/gcc-8-branch/gcc/testsuite/gcc.dg/store_merging_24.c branches/gcc-8-branch/gcc/testsuite/gcc.dg/store_merging_25.c Modified: branches/gcc-8-branch/gcc/ChangeLog branches/gcc-8-branch/gcc/gimple-ssa-store-merging.c branches/gcc-8-branch/gcc/testsuite/ChangeLog
