llvm/llvm-project

scalbln(x, n), scalbn(x, n), ldexp(x, n) are not folded at the compilation time when (x, n) is constant

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#112.631 aberto em 16 de out. de 2024

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floating-pointgood first issuellvm:optimizationsmissed-optimization

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Description

Consider the following example. https://godbolt.org/z/54xsG8WTr

#include <cmath>

double f1() {
  return std::scalbln(3.0, 4);
}

double f2() {
  return std::scalbn(3.0, 4);
}

double f3() {
  return std::ldexp(3.0, 4);
}

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