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Add support for generating CMPXCHG16B on x86-64 for the cmpxchg IR instruction.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138660 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-08-26 21:21:21 +00:00
parent 51fb91c04c
commit 43f51aeca8
8 changed files with 107 additions and 48 deletions
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2
lib/Target/X86/X86Subtarget.cpp
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@ -203,6 +203,7 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
HasFMA3 = IsIntel && ((ECX >> 12) & 0x1); ToggleFeature(X86::FeatureFMA3);
HasPOPCNT = IsIntel && ((ECX >> 23) & 0x1); ToggleFeature(X86::FeaturePOPCNT);
HasAES = IsIntel && ((ECX >> 25) & 0x1); ToggleFeature(X86::FeatureAES);
HasCmpxchg16b = ((ECX >> 13) & 0x1); ToggleFeature(X86::FeatureCMPXCHG16B);
if (IsIntel || IsAMD) {
// Determine if bit test memory instructions are slow.
@ -254,6 +255,7 @@ X86Subtarget::X86Subtarget(const std::string &TT, const std::string &CPU,
, IsBTMemSlow(false)
, IsUAMemFast(false)
, HasVectorUAMem(false)
, HasCmpxchg16b(false)
, stackAlignment(8)
// FIXME: this is a known good value for Yonah. How about others?
, MaxInlineSizeThreshold(128)