diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 98caf5b2c43..35801474e1c 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -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)); } } |
