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https://chromium.googlesource.com/libyuv/libyuv
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700f153cb8
Implement Qualcomm Hexagon Vector Extensions (HVX) 128-byte SIMD optimizations and runtime CPU detection for Hexagon DSP targets: - CPU detection: Add kCpuHasHexagon and kCpuHasHVX flags, LIBYUV_DISABLE_HVX environment variable support, and Hexagon unit_test mmap/munmap shims. - Rotate/Transpose (rotate_hvx.cc): Implement TransposeWxH_HVX, TransposeUVWxH_HVX, TransposeWxH_16_HVX, and TransposeWxH_32_HVX using power-of-2 vdeal/vshuff butterfly networks. - Compare (compare_hvx.cc): Implement HammingDistance_HVX, SumSquareError_HVX, HashDjb2_HVX, and Ssim4x4Row_HVX. - Scale (scale_hvx.cc): Implement 16 scale row kernels including ScaleAddRow_HVX, ScaleRowDown2*_HVX (8-bit and 16-bit), ScaleRowDown4*_HVX, ScaleARGBRowDown2*_HVX, and ScaleUVRowDown2*_HVX. - Row functions (row_hvx.cc): Implement 58 row kernels covering copy/set/mirror, split/merge, 8/16-bit conversions, YUV-to-ARGB, ARGB-to-YUV, ARGB channel swizzles, blend, attenuate, and interpolate using hardware-predicated partial loads/stores. R=rrwinterton@gmail.com Bug: None Test: libyuv_unittest on Hexagon v81 simulator and Snapdragon 8 Elite Change-Id: Ib6713de51f6246d95e58c95e629ff03f18e3b91e Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/8604586 Reviewed-by: richard winterton <rrwinterton@gmail.com>
69 lines
1.7 KiB
Markdown
69 lines
1.7 KiB
Markdown
# Introduction
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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.
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# CPU
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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.
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## All CPUs
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LIBYUV_DISABLE_ASM
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## Intel CPUs
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LIBYUV_DISABLE_X86
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LIBYUV_DISABLE_SSE2
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LIBYUV_DISABLE_SSSE3
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LIBYUV_DISABLE_SSE41
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LIBYUV_DISABLE_SSE42
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LIBYUV_DISABLE_AVX
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LIBYUV_DISABLE_AVX2
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LIBYUV_DISABLE_ERMS
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LIBYUV_DISABLE_FMA3
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LIBYUV_DISABLE_F16C
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LIBYUV_DISABLE_AVX512BW
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LIBYUV_DISABLE_AVX512VL
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LIBYUV_DISABLE_AVX512VNNI
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LIBYUV_DISABLE_AVX512VBMI
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LIBYUV_DISABLE_AVX512VBMI2
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LIBYUV_DISABLE_AVX512VBITALG
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LIBYUV_DISABLE_AVX10
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LIBYUV_DISABLE_AVX10_2
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LIBYUV_DISABLE_AVXVNNI
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LIBYUV_DISABLE_AVXVNNIINT8
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LIBYUV_DISABLE_AMXINT8
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## Arm CPUs
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LIBYUV_DISABLE_NEON
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LIBYUV_DISABLE_NEON_DOTPROD
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LIBYUV_DISABLE_NEON_I8MM
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LIBYUV_DISABLE_SVE
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LIBYUV_DISABLE_SVE2
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LIBYUV_DISABLE_SME
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## LOONGARCH CPUs
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LIBYUV_DISABLE_LSX
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LIBYUV_DISABLE_LASX
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## RISCV CPUs
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LIBYUV_DISABLE_RVV
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## Hexagon CPUs
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LIBYUV_DISABLE_HVX
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# Test Width/Height/Repeat
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The unittests default to a small image (128x72) to run fast. This can be set by environment variable to test a specific resolutions.
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You can also repeat the test a specified number of iterations, allowing benchmarking and profiling.
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set LIBYUV_WIDTH=1280
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set LIBYUV_HEIGHT=720
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set LIBYUV_REPEAT=999
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set LIBYUV_FLAGS=-1
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set LIBYUV_CPU_INFO=-1
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