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| author | Dale Johannesen <dalej@apple.com> | 2008-09-05 21:27:19 +0000 |
|---|---|---|
| committer | Dale Johannesen <dalej@apple.com> | 2008-09-05 21:27:19 +0000 |
| commit | d4dac0e9eae825e2a6ea2cdec70405723fcb776d (patch) | |
| tree | 95f25feb8eadadf3334603fd6e0f8cfdce0f1902 /llvm/lib | |
| parent | e556018dc03021e29f7f75c8a84542e3a7240a28 (diff) | |
| download | bcm5719-llvm-d4dac0e9eae825e2a6ea2cdec70405723fcb776d.tar.gz bcm5719-llvm-d4dac0e9eae825e2a6ea2cdec70405723fcb776d.zip | |
Add the next limited-precision expansion.
llvm-svn: 55856
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp index c7e2cd5caba..7cd2bb2ea05 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp @@ -2798,10 +2798,49 @@ SelectionDAGLowering::visitLog2(CallInst &I) { void SelectionDAGLowering::visitLog10(CallInst &I) { SDValue result; + if (getValue(I.getOperand(1)).getValueType() == MVT::f32 && + LimitFloatPrecision>0 && LimitFloatPrecision<=12) { + SDValue operand = getValue(I.getOperand(1)); + SDValue operand1 = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, operand); + SDValue t0 = DAG.getNode(ISD::SRL, MVT::i32, operand1, + DAG.getConstant(23, MVT::i32)); + SDValue t1 = DAG.getNode(ISD::AND, MVT::i32, t0, + DAG.getConstant(255, MVT::i32)); + SDValue t2 = DAG.getNode(ISD::SUB, MVT::i32, t1, + DAG.getConstant(127, MVT::i32)); + SDValue t3 = DAG.getNode(ISD::UINT_TO_FP, MVT::f32, t2); + SDValue t4 = DAG.getNode(ISD::FMUL, MVT::f32, t3, + DAG.getConstantFP(APFloat( + APInt(32, 0x3e9a209a)), MVT::f32)); + SDValue t5 = DAG.getNode(ISD::OR, MVT::i32, operand1, + DAG.getConstant(1065353216, MVT::i32)); + SDValue t6 = DAG.getNode(ISD::AND, MVT::i32, t5, + DAG.getConstant(1073741823, MVT::i32)); + SDValue t7 = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, t6); + SDValue t8 = DAG.getNode(ISD::FP_EXTEND, MVT::f64, t7); + SDValue t9 = DAG.getNode(ISD::FMUL, MVT::f64, t8, + DAG.getConstantFP(APFloat( + APInt(64, 0x3fa863e61d44a337ULL)), MVT::f64)); + SDValue t10 = DAG.getNode(ISD::FSUB, MVT::f64, t9, + DAG.getConstantFP(APFloat( + APInt(64, 0x3fd443f63982ad9aULL)), MVT::f64)); + SDValue t11 = DAG.getNode(ISD::FMUL, MVT::f64, t10, t8); + SDValue t12 = DAG.getNode(ISD::FADD, MVT::f64, t11, + DAG.getConstantFP(APFloat( + APInt(64, 0x3fed5c4641d8bd71ULL)), MVT::f64)); + SDValue t13 = DAG.getNode(ISD::FMUL, MVT::f64, t12, t8); + SDValue t14 = DAG.getNode(ISD::FSUB, MVT::f64, t13, + DAG.getConstantFP(APFloat( + APInt(64, 0x3fe4bef863538c6fULL)), MVT::f64)); + SDValue t15 = DAG.getNode(ISD::FP_ROUND, MVT::f32, t14, + DAG.getConstant(0, MVT::i32)); + result = DAG.getNode(ISD::FADD, MVT::f32, t4, t15); + } else { // No special expansion. - result = DAG.getNode(ISD::FLOG10, - getValue(I.getOperand(1)).getValueType(), - getValue(I.getOperand(1))); + result = DAG.getNode(ISD::FLOG10, + getValue(I.getOperand(1)).getValueType(), + getValue(I.getOperand(1))); + } setValue(&I, result); } |
