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Reintroduce a simple function refactoring done in r112934, also without any functionality changes

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113008 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes 2010-09-03 20:20:02 +00:00
parent be8b084d8a
commit 2a4460606e
1 changed files with 12 additions and 10 deletions
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22
lib/Target/X86/X86ISelLowering.cpp
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@ -5057,6 +5057,16 @@ LowerVECTOR_SHUFFLE_4wide(ShuffleVectorSDNode *SVOp, SelectionDAG &DAG) {
return DAG.getVectorShuffle(VT, dl, LoShuffle, HiShuffle, &MaskOps[0]);
}
static bool MayFoldVectorLoad(SDValue V) {
if (V.hasOneUse() && V.getOpcode() == ISD::BIT_CONVERT)
V = V.getOperand(0);
if (V.hasOneUse() && V.getOpcode() == ISD::SCALAR_TO_VECTOR)
V = V.getOperand(0);
if (MayFoldLoad(V))
return true;
return false;
}
static
SDValue getMOVLowToHigh(SDValue &Op, DebugLoc &dl, SelectionDAG &DAG,
bool HasSSE2) {
@ -5101,15 +5111,9 @@ SDValue getMOVLP(SDValue &Op, DebugLoc &dl, SelectionDAG &DAG, bool HasSSE2) {
// potencial load folding here, otherwise use SHUFPS or MOVSD to match the
// same masks.
bool CanFoldLoad = false;
SDValue TmpV1 = V1;
SDValue TmpV2 = V2;
// Trivial case, when V2 comes from a load.
if (TmpV2.hasOneUse() && TmpV2.getOpcode() == ISD::BIT_CONVERT)
TmpV2 = TmpV2.getOperand(0);
if (TmpV2.hasOneUse() && TmpV2.getOpcode() == ISD::SCALAR_TO_VECTOR)
TmpV2 = TmpV2.getOperand(0);
if (MayFoldLoad(TmpV2))
if (MayFoldVectorLoad(V2))
CanFoldLoad = true;
// When V1 is a load, it can be folded later into a store in isel, example:
@ -5117,9 +5121,7 @@ SDValue getMOVLP(SDValue &Op, DebugLoc &dl, SelectionDAG &DAG, bool HasSSE2) {
// turns into:
// (MOVLPSmr addr:$src1, VR128:$src2)
// So, recognize this potential and also use MOVLPS or MOVLPD
if (TmpV1.hasOneUse() && TmpV1.getOpcode() == ISD::BIT_CONVERT)
TmpV1 = TmpV1.getOperand(0);
if (MayFoldLoad(TmpV1) && MayFoldIntoStore(Op))
if (MayFoldVectorLoad(V1) && MayFoldIntoStore(Op))
CanFoldLoad = true;
if (CanFoldLoad) {