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https://chromium.googlesource.com/libyuv/libyuv
synced 2025-12-07 09:16:48 +08:00
c5745d558a
Make environment variables match ifdefs with one SIMD instruction set word as suffix for functions, ifdefs and environment variables. R=kjellander@chromium.org BUG=libyuv:486 Review URL: https://codereview.chromium.org/1704053002 .
33 lines
1.1 KiB
Markdown
33 lines
1.1 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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LIBYUV_DISABLE_ASM
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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_AVX3
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LIBYUV_DISABLE_ERMS
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LIBYUV_DISABLE_FMA3
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LIBYUV_DISABLE_DSPR2
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LIBYUV_DISABLE_NEON
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# Test Width/Height/Repeat
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The unittests default to a small image (32x18) 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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