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Tidied up TRUNC combine code. NFC.

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Make use of DAG.getBitcast and use clang-format to reduce number of lines (and make it more readable).

llvm-svn: 258644
This commit is contained in:
Simon Pilgrim 2016-01-23 21:50:40 +00:00
parent 640b3f9212
commit 47c949cc50
1 changed files with 5 additions and 9 deletions
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14
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -7020,12 +7020,11 @@ SDValue DAGCombiner::visitTRUNCATE(SDNode *N) {
if (N0.getOpcode() == ISD::ZERO_EXTEND ||
N0.getOpcode() == ISD::SIGN_EXTEND ||
N0.getOpcode() == ISD::ANY_EXTEND) {
// if the source is smaller than the dest, we still need an extend.
if (N0.getOperand(0).getValueType().bitsLT(VT))
// if the source is smaller than the dest, we still need an extend
return DAG.getNode(N0.getOpcode(), SDLoc(N), VT,
N0.getOperand(0));
return DAG.getNode(N0.getOpcode(), SDLoc(N), VT, N0.getOperand(0));
// if the source is larger than the dest, than we just need the truncate.
if (N0.getOperand(0).getValueType().bitsGT(VT))
// if the source is larger than the dest, than we just need the truncate
return DAG.getNode(ISD::TRUNCATE, SDLoc(N), VT, N0.getOperand(0));
// if the source and dest are the same type, we can drop both the extend
// and the truncate.
@ -7061,12 +7060,9 @@ SDValue DAGCombiner::visitTRUNCATE(SDNode *N) {
EVT IndexTy = TLI.getVectorIdxTy(DAG.getDataLayout());
int Index = isLE ? (Elt*SizeRatio) : (Elt*SizeRatio + (SizeRatio-1));
SDValue V = DAG.getNode(ISD::BITCAST, SDLoc(N),
NVT, N0.getOperand(0));
SDLoc DL(N);
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT,
DL, TrTy, V,
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, TrTy,
DAG.getBitcast(NVT, N0.getOperand(0)),
DAG.getConstant(Index, DL, IndexTy));
}
}