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| author | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | 2024-05-03 23:40:04 +0000 |
|---|---|---|
| committer | Gerrit Code Review <noreply-gerritcodereview@google.com> | 2024-05-03 23:40:04 +0000 |
| commit | c1068d3eb9464eb1e6028869524930c57feb716b (patch) | |
| tree | 7aa355fd0b89ec0b2611e17ee84a14c6fa449e22 /docs/environment_variables.md | |
| parent | ad14b7e1bb4ad1db3cc083b70c9179f86b2e2052 (diff) | |
| parent | a270e88f71c875f86ebc612ff3232b204bbc75c9 (diff) | |
| download | libyuv-androidx-glance-release.tar.gz | |
Merge "Snap for 11801295 from 488a2af021e3e7473f083a9435b1472c0d411f3d to androidx-glance-release" into androidx-glance-releaseandroidx-glance-release
Diffstat (limited to 'docs/environment_variables.md')
| -rw-r--r-- | docs/environment_variables.md | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/docs/environment_variables.md b/docs/environment_variables.md new file mode 100644 index 00000000..4eb09659 --- /dev/null +++ b/docs/environment_variables.md @@ -0,0 +1,55 @@ +# Introduction + +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. + +# CPU + +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. + +## All CPUs + LIBYUV_DISABLE_ASM + +## Intel CPUs + LIBYUV_DISABLE_X86 + LIBYUV_DISABLE_SSE2 + LIBYUV_DISABLE_SSSE3 + LIBYUV_DISABLE_SSE41 + LIBYUV_DISABLE_SSE42 + LIBYUV_DISABLE_AVX + LIBYUV_DISABLE_AVX2 + LIBYUV_DISABLE_ERMS + LIBYUV_DISABLE_FMA3 + LIBYUV_DISABLE_F16C + LIBYUV_DISABLE_AVX512BW + LIBYUV_DISABLE_AVX512VL + LIBYUV_DISABLE_AVX512VNNI + LIBYUV_DISABLE_AVX512VBMI + LIBYUV_DISABLE_AVX512VBMI2 + LIBYUV_DISABLE_AVX512VBITALG + LIBYUV_DISABLE_AVX512VPOPCNTDQ + LIBYUV_DISABLE_GFNI + +## ARM CPUs + + LIBYUV_DISABLE_NEON + +## MIPS CPUs + LIBYUV_DISABLE_MSA + +## LOONGARCH CPUs + LIBYUV_DISABLE_LSX + LIBYUV_DISABLE_LASX + +## RISCV CPUs + LIBYUV_DISABLE_RVV + +# Test Width/Height/Repeat + +The unittests default to a small image (128x72) to run fast. This can be set by environment variable to test a specific resolutions. +You can also repeat the test a specified number of iterations, allowing benchmarking and profiling. + + set LIBYUV_WIDTH=1280 + set LIBYUV_HEIGHT=720 + set LIBYUV_REPEAT=999 + set LIBYUV_FLAGS=-1 + set LIBYUV_CPU_INFO=-1 |