diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 607c3bf2336..bd02b1e156b 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -313,6 +313,7 @@ namespace { SDValue visitMGATHER(SDNode *N); SDValue visitMSCATTER(SDNode *N); SDValue visitFP_TO_FP16(SDNode *N); + SDValue visitFP16_TO_FP(SDNode *N); SDValue visitFADDForFMACombine(SDNode *N); SDValue visitFSUBForFMACombine(SDNode *N); @@ -1411,6 +1412,7 @@ SDValue DAGCombiner::visit(SDNode *N) { case ISD::MSCATTER: return visitMSCATTER(N); case ISD::MSTORE: return visitMSTORE(N); case ISD::FP_TO_FP16: return visitFP_TO_FP16(N); + case ISD::FP16_TO_FP: return visitFP16_TO_FP(N); } return SDValue(); } @@ -13122,6 +13124,21 @@ SDValue DAGCombiner::visitFP_TO_FP16(SDNode *N) { return SDValue(); } +SDValue DAGCombiner::visitFP16_TO_FP(SDNode *N) { + SDValue N0 = N->getOperand(0); + + // fold fp16_to_fp(op & 0xffff) -> fp16_to_fp(op) + if (N0->getOpcode() == ISD::AND) { + ConstantSDNode *AndConst = getAsNonOpaqueConstant(N0.getOperand(1)); + if (AndConst && AndConst->getAPIntValue() == 0xffff) { + return DAG.getNode(ISD::FP16_TO_FP, SDLoc(N), N->getValueType(0), + N0.getOperand(0)); + } + } + + return SDValue(); +} + /// Returns a vector_shuffle if it able to transform an AND to a vector_shuffle /// with the destination vector and a zero vector. /// e.g. AND V, <0xffffffff, 0, 0xffffffff, 0>. ==> |
