diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 41 |
1 files changed, 32 insertions, 9 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index f04f401377..146d579d6e 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -3038,15 +3038,38 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) { if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Value)) { if (Value.getOpcode() != ISD::TargetConstantFP) { SDOperand Tmp; - if (CFP->getValueType(0) == MVT::f32) { - Tmp = DAG.getConstant(FloatToBits(CFP->getValue()), MVT::i32); - return DAG.getStore(Chain, Tmp, Ptr, ST->getSrcValue(), - ST->getSrcValueOffset()); - } else if (TLI.isTypeLegal(MVT::i64)) { - assert(CFP->getValueType(0) == MVT::f64 && "Unknown FP type!"); - Tmp = DAG.getConstant(DoubleToBits(CFP->getValue()), MVT::i64); - return DAG.getStore(Chain, Tmp, Ptr, ST->getSrcValue(), - ST->getSrcValueOffset()); + switch (CFP->getValueType(0)) { + default: assert(0 && "Unknown FP type"); + case MVT::f32: + if (!AfterLegalize || TLI.isTypeLegal(MVT::i32)) { + Tmp = DAG.getConstant(FloatToBits(CFP->getValue()), MVT::i32); + return DAG.getStore(Chain, Tmp, Ptr, ST->getSrcValue(), + ST->getSrcValueOffset()); + } + break; + case MVT::f64: + if (!AfterLegalize || TLI.isTypeLegal(MVT::i64)) { + Tmp = DAG.getConstant(DoubleToBits(CFP->getValue()), MVT::i64); + return DAG.getStore(Chain, Tmp, Ptr, ST->getSrcValue(), + ST->getSrcValueOffset()); + } else if (TLI.isTypeLegal(MVT::i32)) { + // Many FP stores are not make apparent until after legalize, e.g. for + // argument passing. Since this is so common, custom legalize the + // 64-bit integer store into two 32-bit stores. + uint64_t Val = DoubleToBits(CFP->getValue()); + SDOperand Lo = DAG.getConstant(Val & 0xFFFFFFFF, MVT::i32); + SDOperand Hi = DAG.getConstant(Val >> 32, MVT::i32); + if (!TLI.isLittleEndian()) std::swap(Lo, Hi); + + SDOperand St0 = DAG.getStore(Chain, Lo, Ptr, ST->getSrcValue(), + ST->getSrcValueOffset()); + Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr, + DAG.getConstant(4, Ptr.getValueType())); + SDOperand St1 = DAG.getStore(Chain, Hi, Ptr, ST->getSrcValue(), + ST->getSrcValueOffset()+4); + return DAG.getNode(ISD::TokenFactor, MVT::Other, St0, St1); + } + break; } } } |