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From: antispam@fricas.org (Waldek Hebisch)
Newsgroups: comp.lang.c
Subject: Re: else ladders practice
Date: Sun, 24 Nov 2024 11:47:58 -0000 (UTC)
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Bart <bc@freeuk.com> wrote:
> On 24/11/2024 01:36, Bart wrote:
>> On 24/11/2024 00:24, Waldek Hebisch wrote:
>>> Bart <bc@freeuk.com> wrote:
> 
>>> And of course, there is a question why program with runtime that
>>> does not matter is written in a low level language?
>> 
>> I mean it doesn't matter if it's half the speed. It might matter if it 
>> was 40 times slower.
>> 
>> There's quite a gulf between even unoptimised native code and even a 
>> fast dynamic language interpreter.
>> 
>> People seem to think that the only choices are the fastest possible C 
>> code at one end, and slow CPython at the other:
>> 
>>    gcc/O3-tcc-----------------------------------------------------CPython
>> 
>> On this scale, gcc/O3 code and tcc code are practically the same!
> 
> (I wasn't able to post results earlier because CPython hadn't finished. 
> But for a JPEG decoder test on an 85Mpixel image, all using the same 
> algorithm:
> 
>   gcc-O3    2.2 seconds
>   mm6-opt   3.3 seconds  (My older compiler with the register optim.)
>   mm7       5.7 seconds  (My unoptimising new one)
>   cc        6.0 seconds  (Unoptimising)
>   tcc       8.1 seconds
>   PyPy     43   seconds  (Uses JIT to optimise hot loops to native code)
>   CPython 386   seconds)

That looks like example of a program that should use optimizing
compiler.

-- 
                              Waldek Hebisch