Optimising for size

[Joel Sherrill]

Joe Buck wrote:
> On Mon, Jul 14, 2008 at 10:04:08AM +1000, zoltan@bendor.com.au wrote:
>   
>> I have a piece of C code. The code, compiled to an ARM THUMB target using
>> gcc 4.0.2, with -Os results in 230 instructions. The exact same code,
>> using the exact same switches compiles to 437 instructions with gcc 4.3.1.
>> Considering that the compiler optimises to size and the much newer
>> compiler emits almost twice as much code as the old one, I think it is an
>> issue.
>>     
>
> Agreed.  I think it's a regression.  Using -Os and getting
> much larger code would qualify.
>
>   
>> So the question is, how should I report it?
>>     
>
> Open a PR with the complete test case, and the command line options you
> used with 4.0.2 and 4.3.1.
>
>   
Please cc me on the PR.  I would like to track this one and
if you provide a preprocessed  test case can quickly
check the size on 3.2.3, 4.1.1, 4.2.4, 4.3.1 and the trunk.

Use joel AT gcc DOT gnu.org

Thanks.

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill@OARcorp.com        On-Line Applications Research
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