Author: dim
Date: Fri Feb 3 23:32:22 2012
New Revision: 230969
URL: http://svn.freebsd.org/changeset/base/230969
Log:
MFC r230393:
Pull in r148240 from upstream llvm trunk:
Make sure the non-SSE lowering for fences correctly clobbers EFLAGS.
PR11768.
In particular, this fixes segfaults during the build of devel/icu on
i386. The __sync_synchronize() builtin used for implementing icu's
internal barrier could lead to incorrect behaviour.
Modified:
stable/9/contrib/llvm/lib/Target/X86/X86InstrCompiler.td
Directory Properties:
stable/9/contrib/llvm/ (props changed)
Modified: stable/9/contrib/llvm/lib/Target/X86/X86InstrCompiler.td
==============================================================================
--- stable/9/contrib/llvm/lib/Target/X86/X86InstrCompiler.td Fri Feb 3
23:27:07 2012 (r230968)
+++ stable/9/contrib/llvm/lib/Target/X86/X86InstrCompiler.td Fri Feb 3
23:32:22 2012 (r230969)
@@ -533,7 +533,7 @@ def ATOMSWAP6432 : I<0, Pseudo, (outs GR
// 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}",
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