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[AVX] Insert/extract subvector lowering support. This includes a

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couple of utility functions that will be used in other places for more
AVX lowering.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125029 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene 2011-02-07 19:36:54 +00:00
parent c046d64f1b
commit a5f2601e4d
1 changed files with 101 additions and 2 deletions
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103
lib/Target/X86/X86ISelLowering.cpp
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@ -60,6 +60,97 @@ STATISTIC(NumTailCalls, "Number of tail calls");
static SDValue getMOVL(SelectionDAG &DAG, DebugLoc dl, EVT VT, SDValue V1,
SDValue V2);
static SDValue Insert128BitVector(SDValue Result,
SDValue Vec,
SDValue Idx,
SelectionDAG &DAG,
DebugLoc dl);
static SDValue Extract128BitVector(SDValue Vec,
SDValue Idx,
SelectionDAG &DAG,
DebugLoc dl);
/// Generate a DAG to grab 128-bits from a vector > 128 bits. This
/// sets things up to match to an AVX VEXTRACTF128 instruction or a
/// simple subregister reference.
static SDValue Extract128BitVector(SDValue Vec,
SDValue Idx,
SelectionDAG &DAG,
DebugLoc dl) {
EVT VT = Vec.getValueType();
assert(VT.getSizeInBits() == 256 && "Unexpected vector size!");
EVT ElVT = VT.getVectorElementType();
int Factor = VT.getSizeInBits() / 128;
EVT ResultVT = EVT::getVectorVT(*DAG.getContext(),
ElVT,
VT.getVectorNumElements() / Factor);
// Extract from UNDEF is UNDEF.
if (Vec.getOpcode() == ISD::UNDEF)
return DAG.getNode(ISD::UNDEF, dl, ResultVT);
if (isa<ConstantSDNode>(Idx)) {
unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
// Extract the relevant 128 bits. Generate an EXTRACT_SUBVECTOR
// we can match to VEXTRACTF128.
unsigned ElemsPerChunk = 128 / ElVT.getSizeInBits();
// This is the index of the first element of the 128-bit chunk
// we want.
unsigned NormalizedIdxVal = (((IdxVal * ElVT.getSizeInBits()) / 128)
* ElemsPerChunk);
SDValue VecIdx = DAG.getConstant(NormalizedIdxVal, MVT::i32);
SDValue Result = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, ResultVT, Vec,
VecIdx);
return Result;
}
return SDValue();
}
/// 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.
static SDValue Insert128BitVector(SDValue Result,
SDValue Vec,
SDValue Idx,
SelectionDAG &DAG,
DebugLoc dl) {
if (isa<ConstantSDNode>(Idx)) {
EVT VT = Vec.getValueType();
assert(VT.getSizeInBits() == 128 && "Unexpected vector size!");
EVT ElVT = VT.getVectorElementType();
unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
EVT ResultVT = Result.getValueType();
// Insert the relevant 128 bits.
unsigned ElemsPerChunk = 128 / ElVT.getSizeInBits();
// This is the index of the first element of the 128-bit chunk
// we want.
unsigned NormalizedIdxVal = (((IdxVal * ElVT.getSizeInBits()) / 128)
* ElemsPerChunk);
SDValue VecIdx = DAG.getConstant(NormalizedIdxVal, MVT::i32);
Result = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResultVT, Result, Vec,
VecIdx);
return Result;
}
return SDValue();
}
static TargetLoweringObjectFile *createTLOF(X86TargetMachine &TM) {
const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
bool is64Bit = Subtarget->is64Bit();
@ -4189,6 +4280,7 @@ static SDValue EltsFromConsecutiveLoads(EVT VT, SmallVectorImpl<SDValue> &Elts,
SDValue
X86TargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
// All zero's are handled with pxor in SSE2 and above, xorps in SSE1.
// All one's are handled with pcmpeqd. In AVX, zero's are handled with
// vpxor in 128-bit and xor{pd,ps} in 256-bit, but no 256 version of pcmpeqd
@ -5918,7 +6010,14 @@ X86TargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const {
SDValue
X86TargetLowering::LowerEXTRACT_SUBVECTOR(SDValue Op, SelectionDAG &DAG) const {
if (Subtarget->hasAVX()) {
// TODO
DebugLoc dl = Op.getNode()->getDebugLoc();
SDValue Vec = Op.getNode()->getOperand(0);
SDValue Idx = Op.getNode()->getOperand(1);
if (Op.getNode()->getValueType(0).getSizeInBits() == 128
&& Vec.getNode()->getValueType(0).getSizeInBits() == 256) {
return Extract128BitVector(Vec, Idx, DAG, dl);
}
}
return SDValue();
}
@ -5936,7 +6035,7 @@ X86TargetLowering::LowerINSERT_SUBVECTOR(SDValue Op, SelectionDAG &DAG) const {
if (Op.getNode()->getValueType(0).getSizeInBits() == 256
&& SubVec.getNode()->getValueType(0).getSizeInBits() == 128) {
// TODO
return Insert128BitVector(Vec, SubVec, Idx, DAG, dl);
}
}
return SDValue();