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Re: Enabling -frename-registers?
- From: David Edelsohn <dje dot gcc at gmail dot com>
- To: Bernd Schmidt <bschmidt at redhat dot com>
- Cc: Jeffrey Law <law at redhat dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>, Segher Boessenkool <segher at kernel dot crashing dot org>
- Date: Fri, 29 Apr 2016 09:42:47 -0400
- Subject: Re: Enabling -frename-registers?
- Authentication-results: sourceware.org; auth=none
- References: <CAGWvnykBEjYMgOCaR_ZGLwB3fxPg-pB3WPSwAvmUBXzmXct8gg at mail dot gmail dot com> <57236285 dot 5090908 at redhat dot com>
On Fri, Apr 29, 2016 at 9:32 AM, Bernd Schmidt <bschmidt@redhat.com> wrote:
> On 04/29/2016 03:02 PM, David Edelsohn wrote:
>>
>> How has this show general benefit for all architectures to deserve
>> enabling it by default at -O2?
>
>
> It should improve postreload scheduling in general, and it can also help
> clear up bad code generation left behind by register allocation.
Did you test the actual performance benefit on any architectures,
especially architectures other than x86?
Thanks, David