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 performance. 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 code. 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_DSPR2 21 LIBYUV_DISABLE_NEON 22 23 # Test Width/Height/Repeat 24 25 The unittests default to a small image (128x72) 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 benchmarking 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 33
