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Subject: Re: [PATCH v2 05/15] RISC-V: Generic <string.h> Routines
To: Joseph Myers <joseph@codesourcery.com>
Cc: libc-alpha@sourceware.org
References: <mhng-fcc68f89-fea8-473f-b36f-38c98f74c978@palmer-si-x1c4>
 <alpine.DEB.2.20.1801010050290.28505@digraph.polyomino.org.uk>
 <5b973b74-f3aa-4525-a548-b0bc9ca95208@linaro.org>
 <alpine.DEB.2.20.1801031602090.5973@digraph.polyomino.org.uk>
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Message-ID: <c0dc6ba0-a87d-346d-702f-b86a28f3673d@linaro.org>
Date: Wed, 03 Jan 2018 16:08:00 -0000
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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.