commit 206ca569aad8551e3e05a3d773f70e6baadfde8c
author Eli Friedman <eli.friedman@gmail.com> Mon Jan 16 16:42:21 2012 +0000
committer Eli Friedman <eli.friedman@gmail.com> Mon Jan 16 16:42:21 2012 +0000
tree 0498dd1ffe718788e01c98f2db8e71805226493f
parent 75e3db4c7ac67c8966dfa3c28a68b1d4edd55112

Make sure the non-SSE lowering for fences correctly clobbers EFLAGS.  PR11768.

llvm-svn: 148240

llvm/lib/Target/X86/X86InstrCompiler.td

diff --git a/llvm/lib/Target/X86/X86InstrCompiler.td b/llvm/lib/Target/X86/X86InstrCompiler.td
index 5649ba5..1106b85b 100644
--- a/llvm/lib/Target/X86/X86InstrCompiler.td
+++ b/llvm/lib/Target/X86/X86InstrCompiler.td
@@ -551,7 +551,7 @@
 // Memory barriers
 
 // TODO: Get this to fold the constant into the instruction.
-let isCodeGenOnly = 1 in
+let isCodeGenOnly = 1, Defs = [EFLAGS] in
 def OR32mrLocked  : I<0x09, MRMDestMem, (outs), (ins i32mem:$dst, GR32:$zero),
                       "lock\n\t"
                       "or{l}\t{$zero, $dst|$dst, $zero}",