docs/environment_variables.md - Issue 1703653002: Add all wiki pages as MarkDown documents + README.md

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Issue 1703653002: Add all wiki pages as MarkDown documents + README.md (Closed) Base URL: https://chromium.googlesource.com/libyuv/libyuv@master

Patch Set: Updated after review and fixed links Created 4 years, 10 months ago

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	1 # Introduction

	2

	3 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 performan ce.

	4

	5 # CPU

	6

	7 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 c ode. Set the variable to 1 to disable the specified instruction set.

	8

	9 LIBYUV_DISABLE_ASM

	10 LIBYUV_DISABLE_X86

	11 LIBYUV_DISABLE_SSE2

	12 LIBYUV_DISABLE_SSSE3

	13 LIBYUV_DISABLE_SSE41

	14 LIBYUV_DISABLE_SSE42

	15 LIBYUV_DISABLE_AVX

	16 LIBYUV_DISABLE_AVX2

	17 LIBYUV_DISABLE_AVX3

	18 LIBYUV_DISABLE_ERMS

	19 LIBYUV_DISABLE_FMA3

	20 LIBYUV_DISABLE_MIPS_DSPR2

	21 LIBYUV_DISABLE_NEON

	22

	23 # Test Width/Height/Repeat

	24

	25 The unittests default to a small image (32x18) to run fast. This can be set by environment variable to test a specific resolutions.

	26 You can also repeat the test a specified number of iterations, allowing benchmar king and profiling.

	27

	28 set LIBYUV_WIDTH=1280

	29 set LIBYUV_HEIGHT=720

	30 set LIBYUV_REPEAT=999

	31 set LIBYUV_FLAGS=-1

	32 set LIBYUV_CPU_INFO=-1

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