Re: Please revert b2e843161d

> On 24 Jun 2026, at 19:58, Steve Kargl <[email protected]> wrote:
> 
> Can someone with commit access please revert b2e843161dc3b?
> 
>   git log -r b2e843161dc3b79777e873183447c92ed9c3703a
>   Author: Andrew Turner <[email protected]>
>   Date:   Tue Nov 2 11:31:17 2021 +0000
> 
>   Use a builtin where possible in msun
> 
> 
> If one has a libm built with, e.g., -DUSE_BUILTIN_FMAF,
> and then tries to debug code that uses fmaf() where the
> compiler options include -fno-builtin, a segfault
> occurs.  I suggest purging all of the recent additions
> of USE_BUILTIN_*.  These are simply not needed as a compiler
> will use a builtin (if available) instead of a function from
> libm.

What architecture and compiler are you using to build libm?

I only enabled it on arm64 as both llvm and gcc will generate the optimal assembly instruction. Other architectures and compilers the builtin may generate a call to fmaf creating an infinite loop.

Andrew