[Bug tree-optimization/83843] [8 Regression] wrong code at -O2

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83843

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Jan 16 08:53:09 2018
New Revision: 256727

URL: https://gcc.gnu.org/viewcvs?rev=256727&root=gcc&view=rev
Log:
        PR tree-optimization/83843
        * gimple-ssa-store-merging.c
        (imm_store_chain_info::output_merged_store): Handle bit_not_p on
        store_immediate_info for bswap/nop orig_stores.

        * gcc.dg/store_merging_18.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/store_merging_18.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-store-merging.c
    trunk/gcc/testsuite/ChangeLog