[Bug middle-end/54149] write introduction incorrect wrt the C11 memory model

[aldyh at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54149

--- Comment #3 from Aldy Hernandez <aldyh at gcc dot gnu.org> 2012-09-11 
12:28:11 UTC ---
Author: aldyh
Date: Tue Sep 11 12:28:02 2012
New Revision: 191179

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191179
Log:
        PR middle-end/54149
        * tree-ssa-loop-im.c (execute_sm_if_changed_flag_set): Only set
        flag for writes.

Added:
    trunk/gcc/testsuite/gcc.dg/simulate-thread/speculative-store-4.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-loop-im.c