_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE exp10(__CLC_GENTYPE val) {
  // exp10(x) = exp2(x * log2(10))
#if __CLC_FPSIZE == 32
  return exp2(val * log2(10.0f));
#elif __CLC_FPSIZE == 64
  return exp2(val * log2(10.0));
#else
#error unknown _CLC_FPSIZE
#endif
}