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X86: when we are auto-detecting the subtarget features, make sure we turn on

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FeatureFastUAMem for Nehalem, Westmere and Sandy Bridge.

FeatureFastUAMem is already on if we pass in nehalem or westmere as a command
argument.

rdar: 7252306


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161717 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren 2012-08-10 23:43:32 +00:00
parent eb74c08192
commit 743a2cff04
2 changed files with 8 additions and 3 deletions
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7
lib/Target/X86/X86Subtarget.cpp
View File

@ -246,8 +246,11 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
}
// If it's Nehalem, unaligned memory access is fast.
// FIXME: Nehalem is family 6. Also include Westmere and later processors?
if (Family == 15 && Model == 26) {
// Include Westmere and Sandy Bridge as well.
// FIXME: add later processors.
if ((Family == 6 && Model == 26) ||
(Family == 6 && Model == 44) ||
(Family == 6 && Model == 42)) {
IsUAMemFast = true;
ToggleFeature(X86::FeatureFastUAMem);
}

4
test/CodeGen/X86/alignment-2.ll
View File

@ -18,7 +18,9 @@
define signext i8 @do_lo_list() nounwind optsize ssp {
bb:
; CHECK: do_lo_list
; CHECK-NOT: movaps
; Make sure we do not use movaps for the global variable.
; It is okay to use movaps for writing the local variable on stack.
; CHECK-NOT: movaps {{[0-9]*}}(%{{[a-z]*}}), {{%xmm[0-9]}}
%myopt = alloca %struct.printQueryOpt, align 4
%tmp = bitcast %struct.printQueryOpt* %myopt to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* bitcast (%struct.printQueryOpt* getelementptr inbounds (%struct._psqlSettings* @pset, i32 0, i32 4) to i8*), i32 76, i32 4, i1 false)