[PATCH 3/5] checksum: use pre increment.

[Ondrej Filip]

On 25.4.2010 23:40, Joakim Tjernlund wrote:
> 
> Martin Mares <mj at ucw.cz> wrote on 2010/04/25 23:33:49:
>>
>>> Some archs(RISC like archs) can do pre increment and load
>>> in one insn but gcc optimization often fails to take advantage
>>> of that. Help gcc to do the right thing by using pre increment
>>> instead of post increment.
>>
>> This one is a little bit dubious, I would rather not twist the code
>> so much in order to help a specific version of GCC. I guess that this
>> will vary wildly between GCC versions.
> 
> Sadly not, I have used 2.95, 3.4.6 and 4.3.4 and PowerPC still
> doesn't get it right. I agree that gcc SHOULD fix this but in real
> life it doesn't so I always help gcc when it comes to loops such
> as these.

I support MJ's view. I don't think it's a good idea to add asm lines
to BIRD's code.

			Ondrej


> 
>  Jocke