Move asm routines to common. Delete obsolete decoder routines.
Use wider routines where applicable.
~1.07x overall faster decode on a quick 720p30 4Mbps test on Haswell.
We do four blocks at a time when possible, but need to handle
single blocks at a time for intra prediction.
~3.15x speedup over MMX for the DCT on Haswell.
~2.94x speedup over MMX for the IDCT on Haswell.
Returns diminish with increasing vector length because a larger
proportion of the time is spent on load/store/shuffling.
We do four blocks at a time when possible, but need to handle
single blocks at a time for intra prediction.
~2.31x speedup over MMX for the DCT on Haswell.
~1.92x speedup over MMX for the IDCT on Haswell.
Do some shuffling in load/store unpack/pack to save some
work in horizontal DCTs.
Use a few 128-bit broadcasts to compact data vectors a bit.
~1.04x speedup for the DCT case on Haswell.
~1.12x speedup for the IDCT case on Haswell.
Use a combination of instruction types that distributes more
evenly across execution ports on common architectures.
Do the horizontal IDCT without transposing back and forth.
Minor tweaks.
~1.14x faster on Haswell. Should be faster on other architectures
as well.
Use a combination of instruction types that distributes more
evenly across execution ports on common architectures.
Do the horizontal DCT without transposing back and forth.
Minor tweaks.
~1.54x faster on Haswell. Should be faster on other architectures
as well.
Previously the assembly sources had mixed indentation consisting
of both spaces and tabs, making it quite hard to read unless
the right tab size was used in the editor.
Tabs have been interpreted as 4 spaces in most cases, matching
the surrounding code.
