| commit | ec6941f7bc5b3ea354825cef24085e8d4abbab02 | [log] [tgz] |
|---|---|---|
| author | DRC <information@libjpeg-turbo.org> | Fri Jan 15 09:29:11 2016 -0600 |
| committer | DRC <information@libjpeg-turbo.org> | Fri Jan 15 11:21:48 2016 -0600 |
| tree | 6e9a8c91e2a336d54792f9bf63fe17fd2b6db901 | |
| parent | 499c470b63fb427791b2602fcc0d3f165a81144c [diff] |
Complete the ARM64 NEON SIMD implementation
This adds 64-bit NEON coverage for all of the algorithms that are
covered by the 32-bit NEON implementation, except for h2v1 (4:2:2) fancy
upsampling (used when decompressing 4:2:2 JPEG images.) It also adds
64-bit NEON SIMD coverage for:
* slow integer forward DCT (compressor)
* h2v2 (4:2:0) downsampling (compressor)
* h2v1 (4:2:2) downsampling (compressor)
which are not covered in the 32-bit implementation.
Compression speedups relative to libjpeg-turbo 1.4.2:
Apple A7 (iPhone 5S), iOS, 64-bit: 113-150% (reported)
48-core ThunderX (RunAbove ARM Cloud), Linux, 64-bit: 2.1-33% (avg. 15%)
Refer to #44 and #49 for discussion
This commit also removes the unnecessary
if (simd_support & JSIMD_ARM_NEON)
statements from the jsimd* algorithm functions. Since the jsimd_can*()
functions check for the existence of NEON, the corresponding algorithm
functions will never be called if NEON isn't available.
Based on:
https://github.com/mayeut/libjpeg-turbo/commit/dcd9d84f10fae192c0e3935818dc289bca9c3e29
https://github.com/mayeut/libjpeg-turbo/commit/b0d87b811f37bd560083deea8c6e7d704e5cd944
https://github.com/mayeut/libjpeg-turbo/commit/70cd5c8a493a67f4d54dd2067ae6dedb65d95389
https://github.com/mayeut/libjpeg-turbo/commit/3e58d9a064648503c57ec2650ee79880f749a52b
https://github.com/mayeut/libjpeg-turbo/commit/837b19542f53fa81af83e6ba002d559877aaf597
https://github.com/mayeut/libjpeg-turbo/commit/73dc43ccc870c2e10ba893e9764b8e48d6836585
https://github.com/mayeut/libjpeg-turbo/commit/a82b71a261b4c0213f558baf4bc745f1c27356d8
https://github.com/mayeut/libjpeg-turbo/commit/c1b1188c2106d6ea7b76644b6023b57edeb602e1
https://github.com/mayeut/libjpeg-turbo/commit/305c89284e1bb222b34fbc7261f697a0cc452a41
https://github.com/mayeut/libjpeg-turbo/commit/7f443f99950b4d7d442b9b879648eca5273209bd
https://github.com/mayeut/libjpeg-turbo/commit/4c2b53b77da5a20e30e2aadaeddb0efbfe24e06d
Unified version with fixes:
https://github.com/mayeut/libjpeg-turbo/commit/1004a3cd05870612a194b410efeaa1b4da76d246