1# Introduction 2 3For 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 7By 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## All CPUs 10 LIBYUV_DISABLE_ASM 11 12## Intel CPUs 13 LIBYUV_DISABLE_X86 14 LIBYUV_DISABLE_SSE2 15 LIBYUV_DISABLE_SSSE3 16 LIBYUV_DISABLE_SSE41 17 LIBYUV_DISABLE_SSE42 18 LIBYUV_DISABLE_AVX 19 LIBYUV_DISABLE_AVX2 20 LIBYUV_DISABLE_ERMS 21 LIBYUV_DISABLE_FMA3 22 LIBYUV_DISABLE_F16C 23 LIBYUV_DISABLE_AVX512BW 24 LIBYUV_DISABLE_AVX512VL 25 LIBYUV_DISABLE_AVX512VNNI 26 LIBYUV_DISABLE_AVX512VBMI 27 LIBYUV_DISABLE_AVX512VBMI2 28 LIBYUV_DISABLE_AVX512VBITALG 29 LIBYUV_DISABLE_AVX512VPOPCNTDQ 30 LIBYUV_DISABLE_GFNI 31 32## ARM CPUs 33 34 LIBYUV_DISABLE_NEON 35 36## MIPS CPUs 37 LIBYUV_DISABLE_MSA 38 39## LOONGARCH CPUs 40 LIBYUV_DISABLE_LSX 41 LIBYUV_DISABLE_LASX 42 43## RISCV CPUs 44 LIBYUV_DISABLE_RVV 45 46# Test Width/Height/Repeat 47 48The unittests default to a small image (128x72) to run fast. This can be set by environment variable to test a specific resolutions. 49You can also repeat the test a specified number of iterations, allowing benchmarking and profiling. 50 51 set LIBYUV_WIDTH=1280 52 set LIBYUV_HEIGHT=720 53 set LIBYUV_REPEAT=999 54 set LIBYUV_FLAGS=-1 55 set LIBYUV_CPU_INFO=-1 56