Value *Op1 = CI->getArgOperand(0), *Op2 = CI->getArgOperand(1);
if (ConstantFP *Op1C = dyn_cast<ConstantFP>(Op1)) {
- if (Op1C->isExactlyValue(1.0)) // pow(1.0, x) -> 1.0
+ // pow(1.0, x) -> 1.0
+ if (Op1C->isExactlyValue(1.0))
return Op1C;
- if (Op1C->isExactlyValue(2.0)) // pow(2.0, x) -> exp2(x)
+ // pow(2.0, x) -> exp2(x)
+ if (Op1C->isExactlyValue(2.0) && TLI->has(LibFunc::exp2))
return EmitUnaryFloatFnCall(Op2, "exp2", B, Callee->getAttributes());
}
if (Op2C->getValueAPF().isZero()) // pow(x, 0.0) -> 1.0
return ConstantFP::get(CI->getType(), 1.0);
- if (Op2C->isExactlyValue(0.5)) {
+ if (Op2C->isExactlyValue(0.5) &&
+ TLI->has(LibFunc::sqrt) && TLI->has(LibFunc::fabs)) {
// Expand pow(x, 0.5) to (x == -infinity ? +infinity : fabs(sqrt(x))).
// This is faster than calling pow, and still handles negative zero
// and negative infinity correctly.