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Re: [RFD] Extremely large alignment of read-only strings
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Thorsten Glaser <tg at mirbsd dot de>
- Cc: Alexander Monakov <amonakov at ispras dot ru>, GCC Development <gcc at gcc dot gnu dot org>
- Date: Fri, 12 Aug 2016 13:33:35 -0700
- Subject: Re: [RFD] Extremely large alignment of read-only strings
- Authentication-results: sourceware.org; auth=none
- References: <Pine.BSM.4.64L.1607271521240.18257@herc.mirbsd.org> <alpine.LNX.2.20.13.1607281812230.2106@monopod.intra.ispras.ru> <Pine.BSM.4.64L.1607281850160.1271@herc.mirbsd.org> <Pine.BSM.4.64L.1608122001360.858@herc.mirbsd.org>
On Fri, Aug 12, 2016 at 1:01 PM, Thorsten Glaser <tg@mirbsd.de> wrote:
> Dixi quod…
>
>>Alexander Monakov dixit:
>>
>>>First of all, I think option -malign-data=abi (new in GCC 5) addresses your
>>>need: it can be used to reduce the default (excessive) alignment to just the
>>>psABI-dictated value (you can play with this at https://gcc.godbolt.org even if
>>
>>Ah, nice!
>
> … except -malign-data=abi is, apparently, cris-only.
>
'-malign-data=TYPE'
Control how GCC aligns variables. Supported values for TYPE are
'compat' uses increased alignment value compatible uses GCC 4.8 and
earlier, 'abi' uses alignment value as specified by the psABI, and
'cacheline' uses increased alignment value to match the cache line
size. 'compat' is the default.
is supported by x86.
--
H.J.