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Reformat the docs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171091 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-12-26 04:59:20 +00:00
parent 4595528781
commit a05f7cbbde
1 changed files with 7 additions and 20 deletions
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27
lib/Target/X86/X86ISelLowering.cpp
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@ -14408,51 +14408,42 @@ static SDValue PerformTruncateCombine(SDNode *N, SelectionDAG &DAG,
if ((VT == MVT::v4i32) && (OpVT == MVT::v4i64)) {
// On AVX2, v4i64 -> v4i32 becomes VPERMD.
if (Subtarget->hasInt256()) {
// AVX2: v4i64 -> v4i32
// VPERMD
static const int ShufMask[] = {0, 2, 4, 6, -1, -1, -1, -1};
Op = DAG.getNode(ISD::BITCAST, dl, MVT::v8i32, Op);
Op = DAG.getVectorShuffle(MVT::v8i32, dl, Op, DAG.getUNDEF(MVT::v8i32),
ShufMask);
return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, Op,
DAG.getIntPtrConstant(0));
}
// AVX: v4i64 -> v4i32
// On AVX, v4i64 -> v4i32 becomes a sequence that uses PSHUFD and MOVLHPS.
SDValue OpLo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v2i64, Op,
DAG.getIntPtrConstant(0));
SDValue OpHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v2i64, Op,
DAG.getIntPtrConstant(2));
OpLo = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, OpLo);
OpHi = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, OpHi);
// PSHUFD
// The PSHUFD mask:
static const int ShufMask1[] = {0, 2, 0, 0};
SDValue Undef = DAG.getUNDEF(VT);
OpLo = DAG.getVectorShuffle(VT, dl, OpLo, Undef, ShufMask1);
OpHi = DAG.getVectorShuffle(VT, dl, OpHi, Undef, ShufMask1);
// MOVLHPS
// The MOVLHPS mask:
static const int ShufMask2[] = {0, 1, 4, 5};
return DAG.getVectorShuffle(VT, dl, OpLo, OpHi, ShufMask2);
}
if ((VT == MVT::v8i16) && (OpVT == MVT::v8i32)) {
// On AVX2, v8i32 -> v8i16 becomed PSHUFB.
if (Subtarget->hasInt256()) {
// AVX2: v8i32 -> v8i16
Op = DAG.getNode(ISD::BITCAST, dl, MVT::v32i8, Op);
// PSHUFB
SmallVector<SDValue,32> pshufbMask;
for (unsigned i = 0; i < 2; ++i) {
pshufbMask.push_back(DAG.getConstant(0x0, MVT::i8));
@ -14469,16 +14460,13 @@ static SDValue PerformTruncateCombine(SDNode *N, SelectionDAG &DAG,
SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v32i8,
&pshufbMask[0], 32);
Op = DAG.getNode(X86ISD::PSHUFB, dl, MVT::v32i8, Op, BV);
Op = DAG.getNode(ISD::BITCAST, dl, MVT::v4i64, Op);
static const int ShufMask[] = {0, 2, -1, -1};
Op = DAG.getVectorShuffle(MVT::v4i64, dl, Op, DAG.getUNDEF(MVT::v4i64),
&ShufMask[0]);
Op = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v2i64, Op,
DAG.getIntPtrConstant(0));
return DAG.getNode(ISD::BITCAST, dl, VT, Op);
}
@ -14491,7 +14479,7 @@ static SDValue PerformTruncateCombine(SDNode *N, SelectionDAG &DAG,
OpLo = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpLo);
OpHi = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpHi);
// PSHUFB
// The PSHUFB mask:
static const int ShufMask1[] = {0, 1, 4, 5, 8, 9, 12, 13,
-1, -1, -1, -1, -1, -1, -1, -1};
@ -14502,9 +14490,8 @@ static SDValue PerformTruncateCombine(SDNode *N, SelectionDAG &DAG,
OpLo = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, OpLo);
OpHi = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, OpHi);
// MOVLHPS
// The MOVLHPS Mask:
static const int ShufMask2[] = {0, 1, 4, 5};
SDValue res = DAG.getVectorShuffle(MVT::v4i32, dl, OpLo, OpHi, ShufMask2);
return DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, res);
}