[FFmpeg-devel] [PATCH] iirfilter: Use local variables for state in loop for FILTER_O2().

[Justin Ruggles]

4% faster 2nd order ff_iir_filter_flt().
---
 libavcodec/iirfilter.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

I tried most of yesterday and this morning trying to make an asm
version of the float biquad filter, but nothing I came up with was
faster than what gcc did with the C version.  I did, however manage
to speed up the C version by about 4% by adding local variables
inside the inner loop for the 2 states.
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