svn commit: r261162 - head/contrib/llvm/lib/Target/X86/MCTargetDesc

[Dimitry Andric]

Author: dim
Date: Sat Jan 25 16:35:56 2014
New Revision: 261162
URL: http://svnweb.freebsd.org/changeset/base/261162

Log:
  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
  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	Sat Jan 25 16:03:08 2014	(r261161)
+++ head/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp	Sat Jan 25 16:35:56 2014	(r261162)
@@ -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;