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author | dim <dim@FreeBSD.org> | 2014-01-28 08:07:19 +0000 |
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committer | dim <dim@FreeBSD.org> | 2014-01-28 08:07:19 +0000 |
commit | 782dc633da2fa3336558b8b143198f7f95bfab13 (patch) | |
tree | f328f62a3ac8599359f167048e880a0327bc0d60 /contrib/llvm | |
parent | ddff0f179e5021e21815bdb3f71e2353aedbf2ef (diff) | |
download | FreeBSD-src-782dc633da2fa3336558b8b143198f7f95bfab13.zip FreeBSD-src-782dc633da2fa3336558b8b143198f7f95bfab13.tar.gz |
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
Diffstat (limited to 'contrib/llvm')
-rw-r--r-- | contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp b/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp index 598ddee..c995aad 100644 --- a/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp +++ b/contrib/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp @@ -308,8 +308,12 @@ bool X86AsmBackend::writeNopData(uint64_t Count, MCObjectWriter *OW) const { // 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; |