r251377 - in /trunk/gcc: ChangeLog doc/md.texi ...

[amonakov@gcc.gnu.org]

Author: amonakov
Date: Mon Aug 28 10:58:45 2017
New Revision: 251377

URL: https://gcc.gnu.org/viewcvs?rev=251377&root=gcc&view=rev
Log:
optabs: ensure mem_thread_fence is a compiler barrier

	PR target/80640
	* doc/md.texi (mem_thread_fence): Remove mention of mode.  Rewrite.
	* optabs.c (expand_mem_thread_fence): Emit a compiler barrier when
	using targetm.gen_mem_thread_fence.
testsuite/
	* gcc.dg/atomic/pr80640.c: New testcase.


Added:
    trunk/gcc/testsuite/gcc.dg/atomic/pr80640.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/doc/md.texi
    trunk/gcc/optabs.c
    trunk/gcc/testsuite/ChangeLog