[Bug tree-optimization/86990] [9 regression] wrong code at -O2 on x86_64-linux-gnu in 64-bit mode

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86990

--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Fri Sep 21 07:28:42 2018
New Revision: 264458

URL: https://gcc.gnu.org/viewcvs?rev=264458&root=gcc&view=rev
Log:
        PR tree-optimization/86990
        * gimple-ssa-store-merging.c (imm_store_chain_info:coalesce_immediate):
        Check that the entire merged store group is made of constants only for
        overlapping stores.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/20180921-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-store-merging.c
    trunk/gcc/testsuite/ChangeLog