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Re: [f-cpu] Winograd DCT on my seul.org account

On Sun, 21 Apr 2002, Michael Riepe wrote:
>On Sat, Apr 20, 2002 at 07:27:05PM +0200, Juergen Goeritz wrote:
>> On Sat, 20 Apr 2002, Michael Riepe wrote:
>> >On Sat, Apr 20, 2002 at 10:51:37AM +0200, Juergen Goeritz wrote:
>> >[...]
>> >> I spent a long, long time of my life optimizing code for
>> >> processors - maybe you understand when I say, no more!
>> >> I want an automatic approach.
>> >
>> >No compiler will ever be as good as a skilled assembler programmer.
>> >It's only faster.
>> Yes, you are right. But does this speed your development
>> time? Especially for f-cpu it will get very time consuming
>> to optimize by hand and thus will be omitted most of the
>> time. That's why the automatic process is preferable.
>If you run a program once and want the result as fast as possible,
>a compiler is much better. But if you run it a million times, writing
>assembler code becomes pretty cheap.

Maybe we are not living in the same world? In my world
products time to market is 6 to 12 months. The number
of codelines by far exceed 50000. If you are late with
the development or have performance impacts by design
it really costs. For calculation the assembler to C/C++
ratio is set to 20 in time and cost.


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