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Re: [PATCH v2 05/15] RISC-V: Generic <string.h> Routines
On 03/01/2018 14:02, Joseph Myers wrote:
> On Wed, 3 Jan 2018, Adhemerval Zanella wrote:
>
>> Another thing I would like to check before submitting for 2.28 is a way to
>> add a generic index_last_/index_fist_ without using __builtin_{clzl,ctzl}.
>> On some architectures it is implemented by a libgcc call and calling a
>> function call pretty much defeat the optimizations done (I added a generic
>> one for SH).
>
> Maybe a configure test should check whether those use a libgcc function,
> so the default can be set based on that?
>
Yes that is one option I have in mind.