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docs: document LP_NATIVE_VECTOR_WIDTH GALLIUM_OVERRIDE_CPU_CAPS GALLIUM_NOSSE LP_FORCE_SSE2

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Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17813>
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Yonggang Luo 2022-08-27 14:44:49 +08:00 committed by Marge Bot
parent 2918856014
commit 40541e3479
1 changed files with 23 additions and 0 deletions
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docs/drivers/llvmpipe.rst
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@ -87,6 +87,29 @@ To build everything on Linux invoke meson as:
Using
-----
Environment variables
~~~~~~~~~~~~~~~~~~~~~
``LP_NATIVE_VECTOR_WIDTH``
We can use it to override vector bits. Because sometimes it turns
out llvmpipe can be fastest by using 128 bit vectors,
yet use AVX instructions.
``GALLIUM_OVERRIDE_CPU_CAPS``
Override cpu capabilities for llvmpipe and softpipe, possible values for x86:
`nosse`
`sse`
`sse2`
`sse3`
`ssse3`
`sse4.1`
`avx`
``GALLIUM_NOSSE``
Deprecated in favor of `GALLIUM_OVERRIDE_CPU_CAPS`,
use `GALLIUM_OVERRIDE_CPU_CAPS=nosse` instead.
``LP_FORCE_SSE2``
Deprecated in favor of `GALLIUM_OVERRIDE_CPU_CAPS`
use `GALLIUM_OVERRIDE_CPU_CAPS=sse2` instead.
Linux
~~~~~