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Nehalem unaligned memory access is fast.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100089 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-04-01 05:58:17 +00:00
parent 61336ae001
commit 48c58bb861
3 changed files with 15 additions and 2 deletions
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4
lib/Target/X86/X86Subtarget.cpp
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@ -266,6 +266,9 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
unsigned Model = 0;
DetectFamilyModel(EAX, Family, Model);
IsBTMemSlow = IsAMD || (Family == 6 && Model >= 13);
// If it's Nehalem, unaligned memory access is fast.
if (Family == 15 && Model == 26)
IsUAMemFast = true;
GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
HasX86_64 = (EDX >> 29) & 0x1;
@ -286,6 +289,7 @@ X86Subtarget::X86Subtarget(const std::string &TT, const std::string &FS,
, HasFMA3(false)
, HasFMA4(false)
, IsBTMemSlow(false)
, IsUAMemFast(false)
, HasVectorUAMem(false)
, DarwinVers(0)
, stackAlignment(8)