[FFmpeg-devel] [flamefest-start] A little something on MMX/SSE intrinsics
Thu Feb 28 06:29:58 CET 2008
On Thu, 28 Feb 2008 02:53:43 +0100, Michael Niedermayer wrote:
>On Thu, Feb 28, 2008 at 01:43:33AM +0000, M?ns Rullg?rd wrote:
>> Rich Felker <dalias at aerifal.cx> writes:
>> > On Wed, Feb 27, 2008 at 10:59:52PM +0000, M?ns Rullg?rd wrote:
>> >> > I do know that gcc does quite stupid things on x86 be it when
>> >> > compiling C code or intrinsics. And i know that gcc is
>> >> > generally better at compiling x86 code than code for other less
>> >> > common architecures. Combining these does strongly point toward
>> >> > that the gap between intrinsics and asm will be bigger on ppc
>> >> > than x86 not smaller. Of course you are correct that i do not
>> >> > strictly "know" it. Its just VERY likely.
>> >> It is wrong to talk about the probability of something that has a
>> >> definite value, even if it has not yet been measured.
>> >> Probabilities would be appropriate if speculating over the
>> >> abilities of future GCC versions.
>> > Welcome to the world of QM. Unfortunately that's how all facts
>> > are..
>> If the trend in gcc code size keeps up, they won't be in the QM
>> domain for quite some time to come.
>QM is not less true for large things, unless you want to claim that
>gravitational interactions are becoming significant for gcc. In that
>case we of course should apply general relativity. If so it would be
>interresting to calculate how long it will take for it to collaps into
>a black hole if its code size keeps growing ...
>We probably should switch to a different compiler before that happens.
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