armv6: Accelerate butterflies_float
authorBen Avison <bavison@riscosopen.org>
Thu, 10 Jul 2014 23:12:34 +0000 (00:12 +0100)
committerMartin Storsjö <martin@martin.st>
Thu, 17 Jul 2014 22:34:38 +0000 (01:34 +0300)
commit5a272190a04666f0fe41be767396b30712638c21
tree1bff50bd3d7926346d90e319e80bb526b128ee89
parent5edad2c4a1f46bcc56be755af86ab355c2f1b37f
armv6: Accelerate butterflies_float

I benchmarked the result by measuring the number of gperftools samples that
hit anywhere in the AAC decoder (starting from aac_decode_frame()) or
specifically in butterflies_float_c() / ff_butterflies_float_vfp() for the
same sample AAC stream:

                   Before          After
                   Mean   StdDev   Mean   StdDev  Confidence  Change
Audio decode       1542.8 43.7     1470.5 41.5    100.0%      +4.9%
butterflies_float  130.0  11.9     70.2   12.1    100.0%      +85.2%

Signed-off-by: Martin Storsjö <martin@martin.st>
libavutil/arm/float_dsp_init_vfp.c
libavutil/arm/float_dsp_vfp.S