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avoid this libcall with long inline expansion

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78420 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth 2009-08-07 22:37:20 +00:00
parent 32a1b25781
commit 7116b7bb0c
1 changed files with 30 additions and 1 deletions
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31
lib/Target/Alpha/AlphaISelLowering.cpp
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@ -107,7 +107,7 @@ AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM)
setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
setOperationAction(ISD::SRL_PARTS, MVT::i64, Expand);
setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
setOperationAction(ISD::SRA_PARTS, MVT::i64, Expand);
setOperationAction(ISD::SHL_PARTS, MVT::i64, Expand);
@ -578,6 +578,35 @@ SDValue AlphaTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
}
}
case ISD::SRL_PARTS: {
SDValue ShOpLo = Op.getOperand(0);
SDValue ShOpHi = Op.getOperand(1);
SDValue ShAmt = Op.getOperand(2);
SDValue bm = DAG.getNode(ISD::SUB, dl, MVT::i64,
DAG.getConstant(64, MVT::i64), ShAmt);
SDValue BMCC = DAG.getSetCC(dl, MVT::i64, bm,
DAG.getConstant(0, MVT::i64), ISD::SETLE);
// if 64 - shAmt <= 0
SDValue Hi_Neg = DAG.getConstant(0, MVT::i64);
SDValue ShAmt_Neg = DAG.getNode(ISD::SUB, dl, MVT::i64,
DAG.getConstant(0, MVT::i64), bm);
SDValue Lo_Neg = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt_Neg);
// else
SDValue carries = DAG.getNode(ISD::SHL, dl, MVT::i64, ShOpHi, bm);
SDValue Hi_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt);
SDValue Lo_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpLo, ShAmt);
Lo_Pos = DAG.getNode(ISD::OR, dl, MVT::i64, Lo_Pos, carries);
// Merge
SDValue Hi = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Hi_Neg, Hi_Pos);
SDValue Lo = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Lo_Neg, Lo_Pos);
SDValue Ops[2] = { Lo, Hi };
return DAG.getMergeValues(Ops, 2, dl);
}
// case ISD::SRA_PARTS:
// case ISD::SHL_PARTS:
case ISD::SINT_TO_FP: {
assert(Op.getOperand(0).getValueType() == MVT::i64 &&
"Unhandled SINT_TO_FP type in custom expander!");