1*4e366538SXin Li# Introduction 2*4e366538SXin Li 3*4e366538SXin LiFor 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*4e366538SXin Li 5*4e366538SXin Li# CPU 6*4e366538SXin Li 7*4e366538SXin LiBy 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*4e366538SXin Li 9*4e366538SXin Li## All CPUs 10*4e366538SXin Li LIBYUV_DISABLE_ASM 11*4e366538SXin Li 12*4e366538SXin Li## Intel CPUs 13*4e366538SXin Li LIBYUV_DISABLE_X86 14*4e366538SXin Li LIBYUV_DISABLE_SSE2 15*4e366538SXin Li LIBYUV_DISABLE_SSSE3 16*4e366538SXin Li LIBYUV_DISABLE_SSE41 17*4e366538SXin Li LIBYUV_DISABLE_SSE42 18*4e366538SXin Li LIBYUV_DISABLE_AVX 19*4e366538SXin Li LIBYUV_DISABLE_AVX2 20*4e366538SXin Li LIBYUV_DISABLE_ERMS 21*4e366538SXin Li LIBYUV_DISABLE_FMA3 22*4e366538SXin Li LIBYUV_DISABLE_F16C 23*4e366538SXin Li LIBYUV_DISABLE_AVX512BW 24*4e366538SXin Li LIBYUV_DISABLE_AVX512VL 25*4e366538SXin Li LIBYUV_DISABLE_AVX512VNNI 26*4e366538SXin Li LIBYUV_DISABLE_AVX512VBMI 27*4e366538SXin Li LIBYUV_DISABLE_AVX512VBMI2 28*4e366538SXin Li LIBYUV_DISABLE_AVX512VBITALG 29*4e366538SXin Li LIBYUV_DISABLE_AVX512VPOPCNTDQ 30*4e366538SXin Li LIBYUV_DISABLE_GFNI 31*4e366538SXin Li 32*4e366538SXin Li## ARM CPUs 33*4e366538SXin Li 34*4e366538SXin Li LIBYUV_DISABLE_NEON 35*4e366538SXin Li 36*4e366538SXin Li## MIPS CPUs 37*4e366538SXin Li LIBYUV_DISABLE_MSA 38*4e366538SXin Li 39*4e366538SXin Li## LOONGARCH CPUs 40*4e366538SXin Li LIBYUV_DISABLE_LSX 41*4e366538SXin Li LIBYUV_DISABLE_LASX 42*4e366538SXin Li 43*4e366538SXin Li## RISCV CPUs 44*4e366538SXin Li LIBYUV_DISABLE_RVV 45*4e366538SXin Li 46*4e366538SXin Li# Test Width/Height/Repeat 47*4e366538SXin Li 48*4e366538SXin LiThe unittests default to a small image (128x72) to run fast. This can be set by environment variable to test a specific resolutions. 49*4e366538SXin LiYou can also repeat the test a specified number of iterations, allowing benchmarking and profiling. 50*4e366538SXin Li 51*4e366538SXin Li set LIBYUV_WIDTH=1280 52*4e366538SXin Li set LIBYUV_HEIGHT=720 53*4e366538SXin Li set LIBYUV_REPEAT=999 54*4e366538SXin Li set LIBYUV_FLAGS=-1 55*4e366538SXin Li set LIBYUV_CPU_INFO=-1 56