Re: gcc-2.95.3 vs gcc-3.0.4

Martin Dalecki (dalecki@evision-ventures.com)
Sat, 23 Feb 2002 16:00:07 +0100

Andrew Morton wrote:
> Larry McVoy wrote:
>
>>Try 2.72, it's almost twice as fast as 2.95 for builds. For BK, at least,
>>we don't see any benefit from the slower compiler, the code runs the same
>>either way.
>>
>>
>
> Amen.
>
> I want 2.7.2.3 back, but it was the name:value struct initialiser
> bug which killed that off. 2.91.66 isn't much slower than 2.7.x,
> and it's what I use.
>
> "almost twice as fast"? That means that 2.7.2 vs 3.x is getting
> up to a 3x difference. Does anyone know why?

Yes. Basically the reason is a missconception what the compiler
should try to optimize in GCC.

>
> [ Of course, if you can wink-in the object file from someone else,
> it's not a problem. (tum, tee tum...) ]
>
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