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Expand fabs into fneg

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llvm-svn: 21013
This commit is contained in:
Chris Lattner 2005-04-02 05:26:37 +00:00
parent 333132da85
commit 206a694a7b
1 changed files with 9 additions and 1 deletions
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10
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -887,8 +887,16 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
Tmp2 = DAG.getConstantFP(-0.0, Node->getValueType(0));
Result = LegalizeOp(DAG.getNode(ISD::SUB, Node->getValueType(0),
Tmp2, Tmp1));
} else if (Node->getOpcode() == ISD::FABS) {
// Expand Y = FABS(X) -> Y = (X >u 0.0) ? X : fneg(X).
MVT::ValueType VT = Node->getValueType(0);
Tmp2 = DAG.getConstantFP(0.0, VT);
Tmp2 = DAG.getSetCC(ISD::SETUGT, TLI.getSetCCResultTy(), Tmp1, Tmp2);
Tmp3 = DAG.getNode(ISD::FNEG, VT, Tmp1);
Result = DAG.getNode(ISD::SELECT, VT, Tmp2, Tmp1, Tmp3);
Result = LegalizeOp(Result);
} else {
assert(0 && "Expand fneg not impl yet!");
assert(0 && "Unreachable!");
}
break;
}