Author: dim
Date: Mon Oct 22 17:47:37 2012
New Revision: 241895
URL: http://svn.freebsd.org/changeset/base/241895
Log:
Pull in r165878 from upstream llvm trunk:
X86: Disable long nops for all cpus prior to pentiumpro/i686.
This is the safest approach for now. If you think long nops matter a
lot for performance, compile with -march=i686 or higher. :)
MFC after: 3 days
Modified:
head/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
Modified: head/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
==============================================================================
--- head/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp Mon Oct
22 17:23:32 2012 (r241894)
+++ head/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp Mon Oct
22 17:47:37 2012 (r241895)
@@ -307,7 +307,9 @@ bool X86AsmBackend::writeNopData(uint64_
};
// This CPU doesnt support long nops. If needed add more.
- if (CPU == "geode") {
+ // FIXME: Can we get this from the subtarget somehow?
+ if (CPU == "generic" || CPU == "i386" || CPU == "i486" || CPU == "i586" ||
+ CPU == "pentium" || CPU == "pentium-mmx" || CPU == "geode") {
for (uint64_t i = 0; i < Count; ++i)
OW->Write8(0x90);
return true;
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