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https://chromium.googlesource.com/libyuv/libyuv
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0d5a31eccb
Now that there are newer architecture extensions used, update the documentation to reflect this. Also add missing empty lines after headers in environment_variables.md to ensure the file is valid markdown. Change-Id: I61d5616e1f815f80186440f27dd68ac5460c38b1 Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5868021 Reviewed-by: Frank Barchard <fbarchard@chromium.org>
68 lines
1.7 KiB
Markdown
68 lines
1.7 KiB
Markdown
# Introduction
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For test purposes, environment variables can be set to control libyuv behavior. These should only be used for testing, to narrow down bugs or to test performance.
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# CPU
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By default the cpu is detected and the most advanced form of SIMD is used. But you can disable instruction sets selectively, or completely, falling back on C code. Set the variable to 1 to disable the specified instruction set.
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## All CPUs
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LIBYUV_DISABLE_ASM
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## Intel CPUs
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LIBYUV_DISABLE_X86
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LIBYUV_DISABLE_SSE2
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LIBYUV_DISABLE_SSSE3
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LIBYUV_DISABLE_SSE41
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LIBYUV_DISABLE_SSE42
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LIBYUV_DISABLE_AVX
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LIBYUV_DISABLE_AVX2
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LIBYUV_DISABLE_ERMS
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LIBYUV_DISABLE_FMA3
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LIBYUV_DISABLE_F16C
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LIBYUV_DISABLE_AVX512BW
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LIBYUV_DISABLE_AVX512VL
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LIBYUV_DISABLE_AVX512VNNI
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LIBYUV_DISABLE_AVX512VBMI
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LIBYUV_DISABLE_AVX512VBMI2
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LIBYUV_DISABLE_AVX512VBITALG
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LIBYUV_DISABLE_AVX10
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LIBYUV_DISABLE_AVXVNNI
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LIBYUV_DISABLE_AVXVNNIINT8
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LIBYUV_DISABLE_AMXINT8
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## Arm CPUs
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LIBYUV_DISABLE_NEON
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LIBYUV_DISABLE_NEON_DOTPROD
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LIBYUV_DISABLE_NEON_I8MM
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LIBYUV_DISABLE_SVE
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LIBYUV_DISABLE_SVE2
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LIBYUV_DISABLE_SME
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## MIPS CPUs
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LIBYUV_DISABLE_MSA
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## LOONGARCH CPUs
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LIBYUV_DISABLE_LSX
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LIBYUV_DISABLE_LASX
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## RISCV CPUs
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LIBYUV_DISABLE_RVV
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# Test Width/Height/Repeat
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The unittests default to a small image (128x72) to run fast. This can be set by environment variable to test a specific resolutions.
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You can also repeat the test a specified number of iterations, allowing benchmarking and profiling.
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set LIBYUV_WIDTH=1280
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set LIBYUV_HEIGHT=720
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set LIBYUV_REPEAT=999
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set LIBYUV_FLAGS=-1
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set LIBYUV_CPU_INFO=-1
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