On Fri, 30 Dec 2022, Alejandro Colomar via Libc-alpha wrote: > > I expect to implement these functions in due course for glibc (not GCC, > > since these are library functions, with the usual requirements for > > definitions with external linkage, though most would also have inline > > header implementations based on existing longstanding built-in functions). > > Is there any builtin for stdc_bit_ceil()? I've tried to search for it, but > didn't find it. I came to the conclusion that I need to write the ugly code > around __builtin_clz(). I don't think there's such a built-in function, so yes, the inline function would need to use __builtin_clz. (Even the stdc_leading_zeros inline functions will need to do more than just call __builtin_clz - they need to check for zero, since the standard functions have a defined result for a zero argument whereas __builtin_clz doesn't.) -- Joseph S. Myers joseph@xxxxxxxxxxxxxxxx
