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Commit Graph

4 Commits (c7183a22dbc34d02016d92bd19b06a2e665861df)

Author	SHA1	Message	Date
Timo Rothenpieler	ef2c2a2220	avutil/half2float: use native _Float16 if available ... _Float16 support was available on arm/aarch64 for a while, and with gcc 12 was enabled on x86 as long as SSE2 is supported. If the target arch supports f16c, gcc emits fairly efficient assembly, taking advantage of it. This is the case on x86-64-v3 or higher. Same goes on arm, which has native float16 support. On x86, without f16c, it emulates it in software using sse2 instructions. This has shown to perform rather poorly: _Float16 full SSE2 emulation: frame=50074 fps=848 q=-0.0 size=N/A time=00:33:22.96 bitrate=N/A speed=33.9x _Float16 f16c accelerated (Zen2, --cpu=znver2): frame=50636 fps=1965 q=-0.0 Lsize=N/A time=00:33:45.40 bitrate=N/A speed=78.6x classic half2float full software implementation: frame=49926 fps=1605 q=-0.0 Lsize=N/A time=00:33:17.00 bitrate=N/A speed=64.2x Hence an additional check was introduced, that only enables use of _Float16 on x86 if f16c is being utilized. On aarch64, a similar uplift in performance is seen: RPi4 half2float full software implementation: frame= 6088 fps=126 q=-0.0 Lsize=N/A time=00:04:03.48 bitrate=N/A speed=5.06x RPi4 _Float16: frame= 6103 fps=158 q=-0.0 Lsize=N/A time=00:04:04.08 bitrate=N/A speed=6.32x Since arm/aarch64 always natively support 16 bit floats, it can always be considered fast there. I'm not aware of any additional platforms that currently support _Float16. And if there are, they should be considered non-fast until proven fast.	2 years ago
Timo Rothenpieler	6dc79f1d04	avutil/half2float: move non-inline init code out of header	2 years ago
Timo Rothenpieler	f3fb528cd5	avutil/half2float: move tables to header-internal structs ... Having to put the knowledge of the size of those arrays into a multitude of places is rather smelly.	2 years ago
Timo Rothenpieler	b42925264a	avutil: move half-precision float helper to avutil	2 years ago
Paul B Mahol	82131293b0	avcodec/float2half: fix minor style issue	4 years ago
Paul B Mahol	cf2f8dcc6a	avcodec/exrenc: move float2half code to own header	4 years ago