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Prefer movlhps over punpcklqdq, etc. in more cases. 

llvm-svn: 56627
This commit is contained in:
Evan Cheng 2008-09-25 23:35:16 +00:00
parent 0c1b884df1
commit 9dbe45c000
2 changed files with 6 additions and 6 deletions
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10
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -3942,17 +3942,17 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
else if (isIdentityMask(PermMask.getNode(), true))
return V2;
// Canonicalize movddup shuffles.
if (V2IsUndef && Subtarget->hasSSE2() &&
X86::isMOVDDUPMask(PermMask.getNode()))
return CanonicalizeMovddup(Op, V1, PermMask, DAG, Subtarget->hasSSE3());
if (isSplatMask(PermMask.getNode())) {
if (isMMX || NumElems < 4) return Op;
// Promote it to a v4{if}32 splat.
return PromoteSplat(Op, DAG, Subtarget->hasSSE2());
}
// Canonicalize movddup shuffles.
if (V2IsUndef && Subtarget->hasSSE2() &&
X86::isMOVDDUPMask(PermMask.getNode()))
return CanonicalizeMovddup(Op, V1, PermMask, DAG, Subtarget->hasSSE3());
// If the shuffle can be profitably rewritten as a narrower shuffle, then
// do it!
if (VT == MVT::v8i16 || VT == MVT::v16i8) {

2
llvm/test/CodeGen/X86/vec_set-9.ll
View File

@ -1,5 +1,5 @@
; RUN: llvm-as < %s | llc -march=x86-64 | grep movd | count 1
; RUN: llvm-as < %s | llc -march=x86-64 | grep {punpcklqdq.*%xmm0, %xmm0}
; RUN: llvm-as < %s | llc -march=x86-64 | grep {movlhps.*%xmm0, %xmm0}
define <2 x i64> @test3(i64 %A) nounwind {
entry: