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Re: gcc compile for code size

From: Xin Tong <xerox dot time dot tech at gmail dot com>
To: Andrew Haley <aph at redhat dot com>
Cc: gcc-help at gcc dot gnu dot org
Date: Sun, 11 Nov 2012 14:59:46 -0500
Subject: Re: gcc compile for code size
References: <CALKntY31amsELRdER_68aZsqFZFZBAPUrGcE3TO+Op8ZR_NQKQ@mail.gmail.com> <50A00276.2090002@redhat.com>

so as to how the instructions are selected. compiling for code size
does not have an effect ?

Xin


On Sun, Nov 11, 2012 at 2:54 PM, Andrew Haley <aph@redhat.com> wrote:
> On 11/11/2012 07:47 PM, Xin Tong wrote:
>> when gcc is set to compile for minimal code size, what kind of
>> optimizations does gcc apply in comparison to compile for performance
>> ? or it is just gcc spends more time doing the compilation, selecting
>> instruction sequences that are optimal for code size.
>
> No.  GCC does all optimizations *except* those known to increase
> program size.  This usually works pretty well, but isn't perfect.
>
> Andrew.
>

Follow-Ups:
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References:
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  - From: Xin Tong
- Re: gcc compile for code size
  - From: Andrew Haley

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