8a0af4a3f2
Average vertically before horizontally; horizontal averaging is more worksome. Doing the vertical averaging first reduces the number of horizontal averages by half. Use pmaddubsw and pavgw to do the horizontal averaging for a slight performance improvement. Minor tweaks. Improve the SSSE3 dyadic downsample routines and drop the SSE4 routines. The non-temporal loads used in the SSE4 routines do nothing for cache- backed memory AFAIK. Adjust tests because averaging vertically first gives slightly different output. ~2.39x speedup for the widthx32 routine on Haswell when not memory-bound. ~2.20x speedup for the widthx16 routine on Haswell when not memory-bound. Note that the widthx16 routine can be unrolled for further speedup. |
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| .. | ||
| BaseDecoderTest.cpp | ||
| BaseEncoderTest.cpp | ||
| c_interface_test.c | ||
| cpp_interface_test.cpp | ||
| DataGenerator.cpp | ||
| decode_api_test.cpp | ||
| decode_encode_test.cpp | ||
| decoder_ec_test.cpp | ||
| decoder_test.cpp | ||
| encode_decode_api_test.cpp | ||
| encode_decode_api_test.h | ||
| encode_decode_api_test.template | ||
| encode_options_test.cpp | ||
| encoder_test.cpp | ||
| ltr_test.cpp | ||
| sha1.c | ||
| simple_test.cpp | ||
| targets.mk | ||