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7-post thread with @rianflo, Nov 2022. Confirms NOTimothyLottes wrote CAS/FSR1/etc GLSL versions with packed 16-bit math by hand. 'Explicit packed 16-bit works on AMD VK Vega and up. Up to 30% improvement on ALU bound stuff. Lots of occupancy wins.' Constants all packed and aliased as UINT (no conversion overheads). FSR1 source has 'F' (32-bit) and 'H' and 'Hx2' (packed 16-bit) function variants. Sibling to the Nov 2022 GPU tip-line thread (1588906002212323328).
118 lines
3.9 KiB
JSON
118 lines
3.9 KiB
JSON
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"post_id": "1597661267845865474",
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"author": "Florian Hoenig",
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"handle": "rianflo",
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"text": "\"The road to 16-bit floats GPU is paved with our blood\"\n:-/\n\nhttps://www.yosoygames.com.ar/wp/2022/01/the-road-to-16-bit-floats-gpu-is-paved-with-our-blood/",
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"timestamp": "2022-11-29 18:38:24",
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"post_id": "1597717009369735169",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "@rianflo Explicit packed 16-bit works on AMD Vulkan Vega and up. I typically get up to 30% improvement on ALU bound stuff. Lots of occupancy wins. I don't use {HLSL, RenderDoc, Reflection, RADV, or VS/PS}. All constants are packed and aliased as UINT, so no coversion overheads.",
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"timestamp": "2022-11-29 22:19:53",
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"post_id": "1597718146663690240",
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"author": "Florian Hoenig",
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"handle": "rianflo",
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"text": "@NOTimothyLottes Oh I know the benefits. Just no simple clear way to write it in GLSL for vulkan.",
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"timestamp": "2022-11-29 22:24:24",
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"post_id": "1597718560511385600",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "@rianflo Sure there is. CAS/FSR1/etc all shipped with fantastic GLSL versions using 16-bit packed math (I wrote those), all which at the time got fantastic code generation using AMD's drivers.",
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"timestamp": "2022-11-29 22:26:03",
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"post_id": "1597720097753542656",
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"author": "Florian Hoenig",
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"handle": "rianflo",
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"text": "@NOTimothyLottes What GLSL extension did you use?",
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"timestamp": "2022-11-29 22:32:10",
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"post_id": "1597720454000541696",
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"author": "Florian Hoenig",
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"handle": "rianflo",
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"text": "@NOTimothyLottes Oh wait, you're saying you wrote the fp16 math manually?",
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"timestamp": "2022-11-29 22:33:35",
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"post_id": "1597798161665253376",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "@rianflo Explicit packed 16-bit code. FSR1 example: https://github.com/GPUOpen-Effects/FidelityFX-FSR/blob/master/ffx-fsr/ffx_fsr1.h - There are different 'F' (32-bit) and 'H' and 'Hx2' (packed 16-bit) functions.",
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"timestamp": "2022-11-30 03:42:22",
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"source_url": "https://x.com/NOTimothyLottes/status/1597798161665253376"
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