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Add the next limited-precision expansion.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55856 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2798,10 +2798,49 @@ SelectionDAGLowering::visitLog2(CallInst &I) {
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void
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SelectionDAGLowering::visitLog10(CallInst &I) {
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SDValue result;
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if (getValue(I.getOperand(1)).getValueType() == MVT::f32 &&
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LimitFloatPrecision>0 && LimitFloatPrecision<=12) {
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SDValue operand = getValue(I.getOperand(1));
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SDValue operand1 = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, operand);
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SDValue t0 = DAG.getNode(ISD::SRL, MVT::i32, operand1,
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DAG.getConstant(23, MVT::i32));
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SDValue t1 = DAG.getNode(ISD::AND, MVT::i32, t0,
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DAG.getConstant(255, MVT::i32));
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SDValue t2 = DAG.getNode(ISD::SUB, MVT::i32, t1,
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DAG.getConstant(127, MVT::i32));
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SDValue t3 = DAG.getNode(ISD::UINT_TO_FP, MVT::f32, t2);
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SDValue t4 = DAG.getNode(ISD::FMUL, MVT::f32, t3,
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DAG.getConstantFP(APFloat(
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APInt(32, 0x3e9a209a)), MVT::f32));
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SDValue t5 = DAG.getNode(ISD::OR, MVT::i32, operand1,
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DAG.getConstant(1065353216, MVT::i32));
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SDValue t6 = DAG.getNode(ISD::AND, MVT::i32, t5,
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DAG.getConstant(1073741823, MVT::i32));
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SDValue t7 = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, t6);
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SDValue t8 = DAG.getNode(ISD::FP_EXTEND, MVT::f64, t7);
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SDValue t9 = DAG.getNode(ISD::FMUL, MVT::f64, t8,
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DAG.getConstantFP(APFloat(
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APInt(64, 0x3fa863e61d44a337ULL)), MVT::f64));
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SDValue t10 = DAG.getNode(ISD::FSUB, MVT::f64, t9,
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DAG.getConstantFP(APFloat(
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APInt(64, 0x3fd443f63982ad9aULL)), MVT::f64));
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SDValue t11 = DAG.getNode(ISD::FMUL, MVT::f64, t10, t8);
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SDValue t12 = DAG.getNode(ISD::FADD, MVT::f64, t11,
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DAG.getConstantFP(APFloat(
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APInt(64, 0x3fed5c4641d8bd71ULL)), MVT::f64));
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SDValue t13 = DAG.getNode(ISD::FMUL, MVT::f64, t12, t8);
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SDValue t14 = DAG.getNode(ISD::FSUB, MVT::f64, t13,
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DAG.getConstantFP(APFloat(
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APInt(64, 0x3fe4bef863538c6fULL)), MVT::f64));
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SDValue t15 = DAG.getNode(ISD::FP_ROUND, MVT::f32, t14,
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DAG.getConstant(0, MVT::i32));
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result = DAG.getNode(ISD::FADD, MVT::f32, t4, t15);
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} else {
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// No special expansion.
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result = DAG.getNode(ISD::FLOG10,
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getValue(I.getOperand(1)).getValueType(),
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getValue(I.getOperand(1)));
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result = DAG.getNode(ISD::FLOG10,
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getValue(I.getOperand(1)).getValueType(),
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getValue(I.getOperand(1)));
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}
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setValue(&I, result);
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}
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