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Inverse DWT 5x3: lift implementation / SSE accelerated version #953

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rouault opened this issue Jun 14, 2017 · 0 comments
Closed

Inverse DWT 5x3: lift implementation / SSE accelerated version #953

rouault opened this issue Jun 14, 2017 · 0 comments
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@rouault
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rouault commented Jun 14, 2017

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rouault added a commit to rouault/openjpeg that referenced this issue Jun 20, 2017
@rouault
Improve performance of inverse DWT 5x3 (uclouvain#953)
58fdd45 
* Use single-pass lifting inverse wavelet transform.
* For vertical pass, use SSE2 when available so as to process 8 columns
  in parallel. This is the most beneficial improvement, since the
  vertical pass involves a lot of cache trashing.

With the bench_dwt utility with default arguments (16383x16383 image),
time goes from 4.064 s to 1.212 s.
rouault added a commit to rouault/openjpeg that referenced this issue Jun 20, 2017
@rouault
Improve performance of inverse DWT 5x3 (uclouvain#953)
fa55b52 
* Use single-pass lifting inverse wavelet transform.
* For vertical pass, use SSE2 when available so as to process 8 columns
  in parallel. This is the most beneficial improvement, since the
  vertical pass involves a lot of cache trashing.

With the bench_dwt utility with default arguments (16383x16383 image),
time goes from 4.064 s to 1.212 s.
@rouault rouault mentioned this issue Jun 21, 2017
Merged
rouault added a commit that referenced this issue Jun 29, 2017
@rouault
IDWT 5x3: fix bug in AVX2 implementation (#953, #957)
8fa405e
@rouault rouault closed this as completed Jul 30, 2017
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