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Generate FSQRT from calls to the sqrt function, which
allows appropriate backends to generate a sqrt instruction. On x86, this isn't done at -O0 because we go through FastISel instead. This is a behavior change from before this series of sqrt patches started. I think this is OK considering that compile speed is most important at -O0, but could be convinced otherwise. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82778 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4576,6 +4576,15 @@ void SelectionDAGLowering::visitCall(CallInst &I) {
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Tmp.getValueType(), Tmp));
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return;
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}
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} else if (Name == "sqrt" || Name == "sqrtf" || Name == "sqrtl") {
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if (I.getNumOperands() == 2 && // Basic sanity checks.
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I.getOperand(1)->getType()->isFloatingPoint() &&
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I.getType() == I.getOperand(1)->getType()) {
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SDValue Tmp = getValue(I.getOperand(1));
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setValue(&I, DAG.getNode(ISD::FSQRT, getCurDebugLoc(),
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Tmp.getValueType(), Tmp));
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return;
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}
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}
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}
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} else if (isa<InlineAsm>(I.getOperand(0))) {
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