diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-15 03:35:49 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-15 03:35:49 +0000 |
commit | d8bbc7858622b6d9c278469aab701ca0b609cddf (patch) | |
tree | eff41dc61d9f714852212739e6b3738b82a2af87 /third_party/aom/doc/dev_guide/av1_encoder.dox | |
parent | Releasing progress-linux version 125.0.3-1~progress7.99u1. (diff) | |
download | firefox-d8bbc7858622b6d9c278469aab701ca0b609cddf.tar.xz firefox-d8bbc7858622b6d9c278469aab701ca0b609cddf.zip |
Merging upstream version 126.0.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | third_party/aom/doc/dev_guide/av1_encoder.dox | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/third_party/aom/doc/dev_guide/av1_encoder.dox b/third_party/aom/doc/dev_guide/av1_encoder.dox index 0f7e8f87e2..a40b58933b 100644 --- a/third_party/aom/doc/dev_guide/av1_encoder.dox +++ b/third_party/aom/doc/dev_guide/av1_encoder.dox @@ -1313,6 +1313,34 @@ Related functions: All the related functions are listed in \ref coefficient_coding. +\section architecture_simd SIMD usage + +In order to efficiently encode video on modern platforms, it is necessary to +implement optimized versions of many core encoding and decoding functions using +architecture-specific SIMD instructions. + +Functions which have optimized implementations will have multiple variants +in the code, each suffixed with the name of the appropriate instruction set. +There will additionally be an `_c` version, which acts as a reference +implementation which the SIMD variants can be tested against. + +As different machines with the same nominal architecture may support different +subsets of SIMD instructions, we have dynamic CPU detection logic which chooses +the appropriate functions to use at run time. This process is handled by +`build/cmake/rtcd.pl`, with function definitions in the files +`*_rtcd_defs.pl` elsewhere in the codebase. + +Currently SIMD is supported on the following platforms: + +- x86: Requires SSE4.1 or above + +- Arm: Requires Neon (Armv7-A and above) + +We aim to provide implementations of all performance-critical functions which +are compatible with the instruction sets listed above. Additional SIMD +extensions (e.g. AVX on x86, SVE on Arm) are also used to provide even +greater performance where available. + */ /*!\defgroup encoder_algo Encoder Algorithm |