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Turn -0.0 - X -> fneg

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21011 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-04-02 05:04:50 +00:00
parent 43fdea070c
commit b9fccc4193
1 changed files with 13 additions and 1 deletions
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14
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -314,7 +314,7 @@ public:
//
void visitBinary(User &I, unsigned Opcode);
void visitAdd(User &I) { visitBinary(I, ISD::ADD); }
void visitSub(User &I) { visitBinary(I, ISD::SUB); }
void visitSub(User &I);
void visitMul(User &I) { visitBinary(I, ISD::MUL); }
void visitDiv(User &I) {
visitBinary(I, I.getType()->isUnsigned() ? ISD::UDIV : ISD::SDIV);
@ -454,6 +454,18 @@ void SelectionDAGLowering::visitBr(BranchInst &I) {
}
}
void SelectionDAGLowering::visitSub(User &I) {
// -0.0 - X --> fneg
if (ConstantFP *CFP = dyn_cast<ConstantFP>(I.getOperand(0)))
if (CFP->isExactlyValue(-0.0)) {
SDOperand Op2 = getValue(I.getOperand(1));
setValue(&I, DAG.getNode(ISD::FNEG, Op2.getValueType(), Op2));
return;
}
visitBinary(I, ISD::SUB);
}
void SelectionDAGLowering::visitBinary(User &I, unsigned Opcode) {
SDOperand Op1 = getValue(I.getOperand(0));
SDOperand Op2 = getValue(I.getOperand(1));