This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: [patch] Excessive alignment in ix86_data_alignment
- From: Uros Bizjak <ubizjak at gmail dot com>
- To: Kirill Yukhin <kirill dot yukhin at gmail dot com>
- Cc: Petr Murzin <petrmurzin1 at gmail dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Thu, 9 Oct 2014 10:37:12 +0200
- Subject: Re: [patch] Excessive alignment in ix86_data_alignment
- Authentication-results: sourceware.org; auth=none
- References: <CANDVG5j-codZpjAoRVsEUUxdNpGPKHzP4VFX50kc9o8ivsa6Pg at mail dot gmail dot com> <20141009082454 dot GA61071 at msticlxl57 dot ims dot intel dot com>
On Thu, Oct 9, 2014 at 10:25 AM, Kirill Yukhin <kirill.yukhin@gmail.com> wrote:
> On 08 Oct 23:02, Petr Murzin wrote:
>> Hi,
>> I have measured performance impact on Haswell platform according to this
>> input:
>> https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00978.html
What about older processors?
The optimization was introduced well before Haswell for then current
processors, and it was based on the recommendation from Intel
optimization guide. If this optimization doesn't apply for new
processors, then tune option should be introduced and set accordingly.
Uros.