[PATCH 3/3] mpi/longlong.h: x86-64: use tzcnt instruction for trailing zeros

[Jussi Kivilinna]

On 6.10.2022 10.09, NIIBE Yutaka wrote:
> Hello,
> 
> Jussi Kivilinna wrote:
>> * mpi/longlong.h [__x86_64__] (count_trailing_zeros): Add 'rep' prefix
>> for 'bsfq'.
> 
> Is it also applicable to 80x86 (IA-32) (adding 'rep')?
> 

Yes it is, I'll add 'rep' for i386 too.

> 
> Besides, I have another issue/concern here.  IIUC, longlong.h upstream
> is GCC.  It would be good to import some other changes from the
> upstream.  For example, in our version for PPC/POWER, we still have old
> two-syntax asm code, that's quite outdated. ( https://dev.gnupg.org/T5980 )

I can take look into it.

-Jussi