Re: Please revert b2e843161d

On 6/25/26 10:57, Andrew Turner wrote:
> 
> I don’t expect it to work on amd64 in the general case. Godbolt shows 
> both GCC and Clang generating an infinite loop jumping to its self [1]. 
> It may work on some architecture levels, however I don’t know enough 
> about amd64 to know if it’s safe to enable.
> 
> The USE_BUILTIN_* flags aren’t intended on being set by users as you found.

The comment in the source code certainly does not alert a
user to not use -DUSE_BUILTIN_FMAF (or any of the other
USE_BUILTIN_*).

Architecture specific code should be in msun/arm/.  It would
also seem to me that if this is indeed arm specific then
it should be guarded with "#if defined(__ARM) && ..."

-- 
steve