svn commit: r230393 - head/contrib/llvm/lib/Target/X86

[Dimitry Andric]

Author: dim
Date: Fri Jan 20 19:18:11 2012
New Revision: 230393
URL: http://svn.freebsd.org/changeset/base/230393

Log:
  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.
  
  MFC after:	3 days

Modified:
  head/contrib/llvm/lib/Target/X86/X86InstrCompiler.td

Modified: head/contrib/llvm/lib/Target/X86/X86InstrCompiler.td
==============================================================================
--- head/contrib/llvm/lib/Target/X86/X86InstrCompiler.td	Fri Jan 20 18:55:56 2012	(r230392)
+++ head/contrib/llvm/lib/Target/X86/X86InstrCompiler.td	Fri Jan 20 19:18:11 2012	(r230393)
@@ -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}",