Author: dim
Date: Tue Jan 28 08:07:19 2014
New Revision: 261225
URL: http://svnweb.freebsd.org/changeset/base/261225
Log:
MFC r261162:
Pull in r195679 from upstream llvm trunk:
Don't use nopl in cpus that don't support it.
Patch by Mikulas Patocka. I added the test. I checked that for cpu names
that
gas knows about, it also doesn't generate nopl.
The modified cpus:
i686 - there are i686-class CPUs that don't have nopl: Via c3, Transmeta
Crusoe, Microsoft VirtualBox - see
https://bbs.archlinux.org/viewtopic.php?pid=775414
k6, k6-2, k6-3, winchip-c6, winchip2 - these are 586-class CPUs
via c3 c3-2 - see https://bugs.archlinux.org/task/19733 as a proof that
Via c3 and c3-Nehemiah don't have nopl
PR: bin/185777
Modified:
stable/9/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
Directory Properties:
stable/9/contrib/llvm/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/10/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
Directory Properties:
stable/10/ (props changed)
Modified: stable/9/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
==============================================================================
--- stable/9/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp Tue Jan
28 07:21:46 2014 (r261224)
+++ stable/9/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp Tue Jan
28 08:07:19 2014 (r261225)
@@ -308,8 +308,12 @@ bool X86AsmBackend::writeNopData(uint64_
// This CPU doesnt support long nops. If needed add more.
// FIXME: Can we get this from the subtarget somehow?
+ // FIXME: We could generated something better than plain 0x90.
if (CPU == "generic" || CPU == "i386" || CPU == "i486" || CPU == "i586" ||
- CPU == "pentium" || CPU == "pentium-mmx" || CPU == "geode") {
+ CPU == "pentium" || CPU == "pentium-mmx" || CPU == "i686" ||
+ CPU == "k6" || CPU == "k6-2" || CPU == "k6-3" || CPU == "geode" ||
+ CPU == "winchip-c6" || CPU == "winchip2" || CPU == "c3" ||
+ CPU == "c3-2") {
for (uint64_t i = 0; i < Count; ++i)
OW->Write8(0x90);
return true;
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