+ // Implementation of unsigned i64 to f32. This implementation has the
+ // advantage of performing rounding correctly.
+ // TODO: Generalize this for use with other types.
+ if (Op0.getValueType() == MVT::i64 && DestVT == MVT::f32) {
+ EVT SHVT = TLI.getShiftAmountTy();
+
+ SDValue And = DAG.getNode(ISD::AND, dl, MVT::i64, Op0,
+ DAG.getConstant(UINT64_C(0xfffffffffffff800), MVT::i64));
+ SDValue Or = DAG.getNode(ISD::OR, dl, MVT::i64, And,
+ DAG.getConstant(UINT64_C(0x800), MVT::i64));
+ SDValue And2 = DAG.getNode(ISD::AND, dl, MVT::i64, Op0,
+ DAG.getConstant(UINT64_C(0x7ff), MVT::i64));
+ SDValue Ne = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
+ And2, DAG.getConstant(UINT64_C(0), MVT::i64), ISD::SETNE);
+ SDValue Sel = DAG.getNode(ISD::SELECT, dl, MVT::i64, Ne, Or, Op0);
+ SDValue Ge = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
+ Op0, DAG.getConstant(UINT64_C(0x0020000000000000), MVT::i64),
+ ISD::SETUGE);
+ SDValue Sel2 = DAG.getNode(ISD::SELECT, dl, MVT::i64, Ge, Sel, Op0);
+
+ SDValue Sh = DAG.getNode(ISD::SRL, dl, MVT::i64, Sel2,
+ DAG.getConstant(32, SHVT));
+ SDValue Trunc = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Sh);
+ SDValue Fcvt = DAG.getNode(ISD::UINT_TO_FP, dl, MVT::f64, Trunc);
+ SDValue TwoP32 =
+ DAG.getConstantFP(BitsToDouble(UINT64_C(0x41f0000000000000)), MVT::f64);
+ SDValue Fmul = DAG.getNode(ISD::FMUL, dl, MVT::f64, TwoP32, Fcvt);
+ SDValue Lo = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Sel2);
+ SDValue Fcvt2 = DAG.getNode(ISD::UINT_TO_FP, dl, MVT::f64, Lo);
+ SDValue Fadd = DAG.getNode(ISD::FADD, dl, MVT::f64, Fmul, Fcvt2);
+ return DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, Fadd,
+ DAG.getIntPtrConstant(0));
+
+ }
+