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[AVX] Implement 256-bit vector lowering for INSERT_VECTOR_ELT.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125187 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene 2011-02-09 15:32:06 +00:00
parent 59982f3ffc
commit 6b38126da3
1 changed files with 36 additions and 6 deletions
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42
lib/Target/X86/X86ISelLowering.cpp
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@ -125,7 +125,9 @@ static SDValue Extract128BitVector(SDValue Vec,
/// Generate a DAG to put 128-bits into a vector > 128 bits. This
/// sets things up to match to an AVX VINSERTF128 instruction or a
/// simple superregister reference.
/// simple superregister reference. Idx is an index in the 128 bits
/// we want. It need not be aligned to a 128-bit bounday. That makes
/// lowering INSERT_VECTOR_ELT operations easier.
static SDValue Insert128BitVector(SDValue Result,
SDValue Vec,
SDValue Idx,
@ -6027,17 +6029,45 @@ X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
EVT EltVT = VT.getVectorElementType();
DebugLoc dl = Op.getDebugLoc();
SDValue N0 = Op.getOperand(0);
SDValue N1 = Op.getOperand(1);
SDValue N2 = Op.getOperand(2);
// If this is a 256-bit vector result, first insert into a 128-bit
// vector and then insert into the 256-bit vector.
if (VT.getSizeInBits() > 128) {
if (!isa<ConstantSDNode>(N2))
return SDValue();
// Get the 128-bit vector.
unsigned NumElems = VT.getVectorNumElements();
unsigned IdxVal = cast<ConstantSDNode>(N2)->getZExtValue();
bool Upper = IdxVal >= NumElems / 2;
SDValue SubN0 = Extract128BitVector(N0, N2, DAG, dl);
// Insert into it.
SDValue ScaledN2 = N2;
if (Upper)
ScaledN2 = DAG.getNode(ISD::SUB, dl, N2.getValueType(), N2,
DAG.getConstant(NumElems /
(VT.getSizeInBits() / 128),
N2.getValueType()));
Op = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, SubN0.getValueType(), SubN0,
N1, ScaledN2);
// Insert the 128-bit vector
// FIXME: Why UNDEF?
return Insert128BitVector(N0, Op, N2, DAG, dl);
}
if (Subtarget->hasSSE41())
return LowerINSERT_VECTOR_ELT_SSE4(Op, DAG);
if (EltVT == MVT::i8)
return SDValue();
DebugLoc dl = Op.getDebugLoc();
SDValue N0 = Op.getOperand(0);
SDValue N1 = Op.getOperand(1);
SDValue N2 = Op.getOperand(2);
if (EltVT.getSizeInBits() == 16 && isa<ConstantSDNode>(N2)) {
// Transform it so it match pinsrw which expects a 16-bit value in a GR32
// as its second argument.