Simd Library Release Notes (2026).

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April X, 2026 (version 6.2.160)

Algorithms

New features
  • Possibility to use non constant B matrix in framework SynetInnerProduct32f.
  • Function SimdSynetInnerProduct32fExternalBufferSize.
  • Parameter 'activation' to function SimdSynetInnerProduct16bInit.
  • Parameter 'params' to function SimdSynetInnerProduct16bSetParams.
  • Base implementation of class SynetGatherElements.
  • Base implementation, SSE4.1, AVX2, AVX-512BW optimizations of function SynetNormalizeLayerForward16bV2.
  • Base implementation, SSE4.1, AVX2, AVX-512BW optimizations of function SynetSoftmax16b.
  • Support of HVX extension (Hexagon platform).
  • HVX optimizations of function AbsDifference.
  • HVX optimizations of function AbsDifferenceSum.
  • HVX optimizations of function AbsGradientSaturatedSum.
  • HVX optimizations of function AddFeatureDifference.
  • HVX optimizations of function BgrToGray.
  • HVX optimizations of function BgrToRgb.
  • HVX optimizations of function FillBgra.
  • HVX optimizations of function FillPixel.
  • HVX optimizations of function AbsSecondDerivativeHistogram.
  • HVX optimizations of function HistogramMasked.
  • HVX optimizations of function HistogramConditional.
  • HVX optimizations of function OperationBinary8u.
  • HVX optimizations of function GetStatistic.
  • HVX optimizations of function GetRowSums.
  • HVX optimizations of function GetColSums.
  • HVX optimizations of function GetAbsDyRowSums.
  • HVX optimizations of function GetAbsDxColSums.
  • HVX optimizations of function ValueSum.
  • HVX optimizations of function SquareSum.
  • HVX optimizations of function ValueSquareSum.
  • HVX optimizations of function ValueSquareSums.
  • HVX optimizations of function CorrelationSum.
  • SSE4.1 optimizations of function BgrToHsl.
Improving
  • AMX-BF16 optimizations of class SynetMergedConvolution16bCdc.
  • AMX-BF16 optimizations of class SynetMergedConvolution16bCd.
  • AMX-BF16 optimizations of class SynetMergedConvolution16bDc.
  • AMX-BF16 optimizations of class SynetInnerProduct16bGemmNN.
Bug fixing
  • Error in SSE4.1, AVX2, AVX-512BW optimizations of function SynetQuantizedPreluLayerForward (possible aligned read of unaligned memory).
  • Error in SSE4.1, AVX2, AVX-512BW optimizations of function SynetQuantizedScaleLayerForward (possible aligned read of unaligned memory).
  • Error in SSE4.1 optimizations of class ResizerFloatBilinear (possible aligned read of unaligned memory).
  • Error in SSE4.1 optimizations of class ResizerBf16Bilinear (possible aligned read of unaligned memory).
  • Error in SSE4.1, AVX2 optimizations of class ResizerByteBilinear (possible aligned read of unaligned memory).
  • Error in SSE4.1 optimizations of class ResizerByteBilinear (possible aligned write to unaligned memory).
  • Error in SSE4.1 optimizations of class ResizerFloatBilinear (possible aligned write to unaligned memory).
  • Memory leak in function Simd::Detection::LoadStringXml.
  • Possible crash in function Simd::ImageLoadFromFile.
  • Possible crash in function Simd::Base64Decode.
  • Possible crash in AVX-512BW optimization of function TransformImageRotate270.
  • Performance bug in AVX-512BW optimization of class SynetMergedConvolution32fCdc.
  • Performance bug in AMX-BF16 optimization of class SynetMergedConvolution16bCdc.
  • Compiler error in assert conditions in function Simd::DeinterleaveBgra.
  • Compiler error in assert conditions in function Simd::DeinterleaveRgb.
  • Compiler error in assert conditions in function Simd::DeinterleaveRgba.
  • Compiler error in assert conditions in function Simd::GetObjectMoments.
  • MSVS compiler bug in Base implementation of function BgrToHsl (Release, x64).
Renaming
  • Function SynetSoftmaxLayerForward to SynetSoftmax32f.

Test framework

New features
  • Tests for verifying functionality of class SynetGatherElements.
  • Tests for verifying functionality of function SynetNormalizeLayerForward16bV2.
  • Tests for verifying functionality of function SynetSoftmax16b.

Documentation

Bug fixing
  • Syntax and lexical errors in project documentation.

March 3, 2026 (version 6.2.159)

Algorithms

New features
  • Base implementation, AMX-BF16 optimizations of class SynetConvolution16bNhwcSpecV2.
  • Support of SimdSynetUnaryOperation32fRound in function SynetUnaryOperation32f.
  • Support of SimdSynetUnaryOperation32fSign in function SynetUnaryOperation32f.
Bug fixing
  • Error in AMX-BF16 optimizations of class SynetConvolution16bNhwcGemmV1 (kernel Convolution16bNhwcGemm_Macro32x32).
  • Error in Base implementation of class SynetQuantizedConvolutionNhwcDepthwiseV2 (multithread using of SimdSynetQuantizedConvolutionForward).
  • Error in Base implementation of class SynetQuantizedConvolutionNhwcDepthwiseV3 (multithread using of SimdSynetQuantizedConvolutionForward).
  • Error in AMX-BF16 optimizations of class SynetConvolution16bNhwcGemmV1 (Inv2x2, kernel Convolution16bNhwcGemm_MacroNx32, unaligned dstH*dstW).
  • Error in AMX-BF16 optimizations of class SynetConvolution16bNhwcGemmV1 (Inv2x2, kernel Convolution16bNhwcGemm_MacroNx32, unaligned dstC).
  • Error in SSE4.1, AVX2, AVX-512BW, NEON optimizations of function AbsDifference (wrong alignment checking).
  • Error in AVX-512BW optimizations of class SynetConvolution32fGemmNN (case of extra large padding).
  • Error in AVX-512BW optimizations of class ResizerNearest.
  • Error in AMX-BF16 optimizations of class SynetMergedConvolution16bCdc (batch > 1, small input size).
  • Error in functions BodyH, BodyW (file SimdSynetConvParam.h).

February 3, 2026 (version 6.2.158)

Algorithms

New features
  • Base implementation, SSE4.1, AVX2, AVX-512BW, NEON optimizations of function MidpointFilterSquare3x3.
  • Base implementation, SSE4.1, AVX2, AVX-512BW, NEON optimizations of function MidpointFilterSquare5x5.
  • Base implementation of class SynetConvolution16bNhwcSpecV2.
  • Base implementation, SSE4.1, AVX2, AVX-512BW, NEON optimizations of function MinFilterSquare3x3.
  • Base implementation, SSE4.1, AVX2, AVX-512BW, NEON optimizations of function MinFilterSquare5x5.
  • Base implementation, SSE4.1, AVX2, AVX-512BW, NEON optimizations of function MaxFilterSquare3x3.
  • Base implementation, SSE4.1, AVX2, AVX-512BW, NEON optimizations of function MaxFilterSquare5x5.
Improving
  • AMX-BF16 optimizations of class SynetConvolution16bNhwcGemmV1.

Test framework

New features
  • Tests for verifying functionality of function MidpointFilterSquare3x3.
  • Tests for verifying functionality of function MidpointFilterSquare5x5.
  • Tests for verifying functionality of function MinFilterSquare3x3.
  • Tests for verifying functionality of function MinFilterSquare5x5.
  • Tests for verifying functionality of function MaxFilterSquare3x3.
  • Tests for verifying functionality of function MaxFilterSquare5x5.
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January 2, 2026 (version 6.2.157)

Algorithms

New features
  • Function Simd::Resize for Simd::Frame.
  • Base implementation of function DrawLine.
  • Base implementation of function DrawRectangle.
  • Base implementation of function FontInit.
  • Base implementation of function FontResize.
  • Base implementation of function FontHeight.
  • Base implementation of function FontMeasure.
  • Base implementation of function FontDraw.
Improving
  • Base implementation, AMX-BF16 optimizations of class SynetConvolution16bNhwcGemmV1.
  • AVX-512BW optimizations of function SynetPoolingMax32f (case of SynetPoolingMax32f2DNhwcSolid2x2).
  • AVX-512BW optimizations of function SynetMergedConvolution32f (InputConvolution1x1).
  • AVX-512BW optimizations of function SynetMergedConvolution32f (DepthwiseConvolution_k3p1d1s1w6).
  • Simd::DrawLine uses SimdDrawLine instead its own implementation.
  • Simd::DrawRectangle uses SimdDrawRectangle instead its own implementation.
  • Simd::Font uses functions SimdFontInit, SimdFontResize, SimdFontHeight, SimdFontMeasure, SimdFontDraw instead of its own implementation.

Python wrapper

New features
  • Function Simd.ResizeFrame.
  • Function Simd.ResizedFrame.
  • Yuv444p member to Simd.FrameFormat enumeration.
  • Method Simd.ImageFrame.Save.
  • Method Simd.ImageFrame.Load.
  • Function Simd.Lib.StretchGray2x2.
  • Function Simd.StretchGray2x2.
  • Function Simd.Lib.BgraToYuv444p.
  • Function Simd.Lib.Yuv444pToRgb.
  • Function Simd.Lib.ReduceGray2x2.
  • Function Simd.ReduceGray2x2.
  • Function Simd.Lib.BgrToYuv444p.
  • Function Simd.Lib.BgraToYuv444p.
  • Function Simd.Lib.Yuv444pToBgr.
  • Function Simd.Lib.Yuv444pToRgba.
  • Function Simd.Lib.DrawLine.
  • Method Simd.Image.DrawLine.
  • Function Simd.Lib.DrawRectangle.
  • Method Simd.Image.DrawRectangle.
  • Function Simd.Lib.FontInit.
  • Function Simd.Lib.FontResize.
  • Function Simd.Lib.FontHeight.
  • Function Simd.Lib.FontMeasure.
  • Function Simd.Lib.FontDraw.
  • Class Simd.TextFont.
  • Method Simd.Image.DrawFilledRectangle.
Improving
  • Support of Simd.FrameFormat.Yuv444p in method Simd.ImageFrame.Recreate.
  • Support of Simd.FrameFormat.Yuv444p in method Simd.ImageFrame.Convert.
Bug fixing
  • Error in method Simd.Frame.Convert.
Renaming
  • Function Simd.Resize to Simd.ResizeImage.
  • Function Simd.Resized to Simd.ResizedImage.

Test framework

New features
  • Tests for verifying functionality of function DrawLine.
  • Tests for verifying functionality of function DrawRectangle.
Bug fixing
  • Error in method Test::PerformanceMeasurerStorage::Clear.
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