[FFmpeg-devel] [Issue 664] [PATCH] Fix AAC PNS Scaling

Robert Swain robert.swain
Fri Oct 10 13:15:30 CEST 2008

2008/10/8 Michael Niedermayer <michaelni at gmx.at>:


> so it seems the gcc version makes a very significant difference as well

It seems there isn't really a good all-round solution here. What shall
we do? I would be inclined to look toward the future and use doubles
for the sums and sqrtf() as this performs best on a modern CPU with
GCC 4.3, but what do you think? I suppose less powerful older cpus
would need better performance more, but obviously ideally we would
want to use whatever is best on the machine in question. Maybe a macro
and configure time testing/identification and mapping based on CPU?


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