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Reapply r97778 and r97779, enabled only for unsigned i64 to f64

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conversions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97854 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-03-06 00:00:55 +00:00
parent b0e59dda18
commit 0fa9d1d901
1 changed files with 25 additions and 0 deletions
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25
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -2008,6 +2008,31 @@ SDValue SelectionDAGLegalize::ExpandLegalINT_TO_FP(bool isSigned,
return Result; return Result;
} }
assert(!isSigned && "Legalize cannot Expand SINT_TO_FP for i64 yet"); assert(!isSigned && "Legalize cannot Expand SINT_TO_FP for i64 yet");
// Implementation of unsigned i64 to f64 following the algorithm in
// __floatundidf in compiler_rt. This implementation has the advantage
// of performing rounding correctly, both in the default rounding mode
// and in all alternate rounding modes.
// TODO: Generalize this for use with other types.
if (Op0.getValueType() == MVT::i64 && DestVT == MVT::f64) {
SDValue TwoP52 =
DAG.getConstant(UINT64_C(0x4330000000000000), MVT::i64);
SDValue TwoP84PlusTwoP52 =
DAG.getConstantFP(BitsToDouble(UINT64_C(0x4530000000100000)), MVT::f64);
SDValue TwoP84 =
DAG.getConstant(UINT64_C(0x4530000000000000), MVT::i64);
SDValue Lo = DAG.getZeroExtendInReg(Op0, dl, MVT::i32);
SDValue Hi = DAG.getNode(ISD::SRL, dl, MVT::i64, Op0,
DAG.getConstant(32, MVT::i64));
SDValue LoOr = DAG.getNode(ISD::OR, dl, MVT::i64, Lo, TwoP52);
SDValue HiOr = DAG.getNode(ISD::OR, dl, MVT::i64, Hi, TwoP84);
SDValue LoFlt = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, LoOr);
SDValue HiFlt = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, HiOr);
SDValue HiSub = DAG.getNode(ISD::FSUB, dl, MVT::f64, HiFlt, TwoP84PlusTwoP52);
return DAG.getNode(ISD::FADD, dl, MVT::f64, LoFlt, HiSub);
}
SDValue Tmp1 = DAG.getNode(ISD::SINT_TO_FP, dl, DestVT, Op0); SDValue Tmp1 = DAG.getNode(ISD::SINT_TO_FP, dl, DestVT, Op0);
SDValue SignSet = DAG.getSetCC(dl, TLI.getSetCCResultType(Op0.getValueType()), SDValue SignSet = DAG.getSetCC(dl, TLI.getSetCCResultType(Op0.getValueType()),