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[x86] Hoist conditions from *every single if* in this routine to

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a single early exit.

And factor the subsequent cast<> from all but one block into a single
variable.

No functionality changed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216645 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-08-28 03:57:13 +00:00
parent 1201cc156f
commit 6abd62fff1
1 changed files with 12 additions and 12 deletions
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24
lib/Target/X86/X86ISelLowering.cpp
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@ -10699,15 +10699,15 @@ X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
SDValue N0 = Op.getOperand(0);
SDValue N1 = Op.getOperand(1);
SDValue N2 = Op.getOperand(2);
if (!isa<ConstantSDNode>(N2))
return SDValue();
auto *N2C = cast<ConstantSDNode>(N2);
unsigned IdxVal = N2C->getZExtValue();
// If the vector is wider than 128 bits, extract the 128-bit subvector, insert
// into that, and then insert the subvector back into the result.
if (VT.is256BitVector() || VT.is512BitVector()) {
if (!isa<ConstantSDNode>(N2))
return SDValue();
// Get the desired 128-bit vector half.
unsigned IdxVal = cast<ConstantSDNode>(N2)->getZExtValue();
SDValue V = Extract128BitVector(N0, IdxVal, DAG, dl);
// Insert the element into the desired half.
@ -10720,10 +10720,10 @@ X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
// Insert the changed part back to the 256-bit vector
return Insert128BitVector(N0, V, IdxVal, DAG, dl);
}
assert(VT.is128BitVector() && "Only 128-bit vector types should be left!");
if (Subtarget->hasSSE41()) {
if ((EltVT.getSizeInBits() == 8 || EltVT.getSizeInBits() == 16) &&
isa<ConstantSDNode>(N2)) {
if (EltVT.getSizeInBits() == 8 || EltVT.getSizeInBits() == 16) {
unsigned Opc;
if (VT == MVT::v8i16) {
Opc = X86ISD::PINSRW;
@ -10737,11 +10737,11 @@ X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
if (N1.getValueType() != MVT::i32)
N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
if (N2.getValueType() != MVT::i32)
N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue());
N2 = DAG.getIntPtrConstant(IdxVal);
return DAG.getNode(Opc, dl, VT, N0, N1, N2);
}
if (EltVT == MVT::f32 && isa<ConstantSDNode>(N2)) {
if (EltVT == MVT::f32) {
// Bits [7:6] of the constant are the source select. This will always be
// zero here. The DAG Combiner may combine an extract_elt index into
// these
@ -10752,13 +10752,13 @@ X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
// value of the incoming immediate.
// Bits [3:0] of the constant are the zero mask. The DAG Combiner may
// combine either bitwise AND or insert of float 0.0 to set these bits.
N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue() << 4);
N2 = DAG.getIntPtrConstant(IdxVal << 4);
// Create this as a scalar to vector..
N1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4f32, N1);
return DAG.getNode(X86ISD::INSERTPS, dl, VT, N0, N1, N2);
}
if ((EltVT == MVT::i32 || EltVT == MVT::i64) && isa<ConstantSDNode>(N2)) {
if (EltVT == MVT::i32 || EltVT == MVT::i64) {
// PINSR* works with constant index.
return Op;
}
@ -10767,13 +10767,13 @@ X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
if (EltVT == MVT::i8)
return SDValue();
if (EltVT.getSizeInBits() == 16 && isa<ConstantSDNode>(N2)) {
if (EltVT.getSizeInBits() == 16) {
// Transform it so it match pinsrw which expects a 16-bit value in a GR32
// as its second argument.
if (N1.getValueType() != MVT::i32)
N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
if (N2.getValueType() != MVT::i32)
N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue());
N2 = DAG.getIntPtrConstant(IdxVal);
return DAG.getNode(X86ISD::PINSRW, dl, VT, N0, N1, N2);
}
return SDValue();