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Factor common code out of individual if blocks into common tail.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168551 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2012-11-25 00:15:07 +00:00
parent 134f78cf41
commit 915562e762
1 changed files with 12 additions and 24 deletions
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36
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -4204,6 +4204,7 @@ SelectionDAGBuilder::visitPow(const CallInst &I) {
IntegerPartOfX = DAG.getNode(ISD::SHL, dl, MVT::i32, IntegerPartOfX,
DAG.getConstant(23, TLI.getPointerTy()));
SDValue TwoToFractionalPartOfX;
if (LimitFloatPrecision <= 6) {
// For floating-point precision of 6:
//
@ -4217,14 +4218,8 @@ SelectionDAGBuilder::visitPow(const CallInst &I) {
SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2,
getF32Constant(DAG, 0x3f3c50c8));
SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
getF32Constant(DAG, 0x3f7f5e7e));
SDValue t6 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, t5);
SDValue TwoToFractionalPartOfX =
DAG.getNode(ISD::ADD, dl, MVT::i32, t6, IntegerPartOfX);
result = DAG.getNode(ISD::BITCAST, dl,
MVT::f32, TwoToFractionalPartOfX);
TwoToFractionalPartOfX = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
getF32Constant(DAG, 0x3f7f5e7e));
} else if (LimitFloatPrecision <= 12) {
// For floating-point precision of 12:
//
@ -4242,14 +4237,8 @@ SelectionDAGBuilder::visitPow(const CallInst &I) {
SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
getF32Constant(DAG, 0x3f324b07));
SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X);
SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6,
getF32Constant(DAG, 0x3f7ff8fd));
SDValue t8 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, t7);
SDValue TwoToFractionalPartOfX =
DAG.getNode(ISD::ADD, dl, MVT::i32, t8, IntegerPartOfX);
result = DAG.getNode(ISD::BITCAST, dl,
MVT::f32, TwoToFractionalPartOfX);
TwoToFractionalPartOfX = DAG.getNode(ISD::FADD, dl, MVT::f32, t6,
getF32Constant(DAG, 0x3f7ff8fd));
} else { // LimitFloatPrecision <= 18
// For floating-point precision of 18:
//
@ -4278,15 +4267,14 @@ SelectionDAGBuilder::visitPow(const CallInst &I) {
SDValue t11 = DAG.getNode(ISD::FADD, dl, MVT::f32, t10,
getF32Constant(DAG, 0x3f317234));
SDValue t12 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t11, X);
SDValue t13 = DAG.getNode(ISD::FADD, dl, MVT::f32, t12,
getF32Constant(DAG, 0x3f800000));
SDValue t14 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, t13);
SDValue TwoToFractionalPartOfX =
DAG.getNode(ISD::ADD, dl, MVT::i32, t14, IntegerPartOfX);
result = DAG.getNode(ISD::BITCAST, dl,
MVT::f32, TwoToFractionalPartOfX);
TwoToFractionalPartOfX = DAG.getNode(ISD::FADD, dl, MVT::f32, t12,
getF32Constant(DAG, 0x3f800000));
}
SDValue t13 = DAG.getNode(ISD::BITCAST, dl,MVT::i32,TwoToFractionalPartOfX);
result = DAG.getNode(ISD::BITCAST, dl, MVT::f32,
DAG.getNode(ISD::ADD, dl, MVT::i32,
t13, IntegerPartOfX));
} else {
// No special expansion.
result = DAG.getNode(ISD::FPOW, dl,