Initial yup_simd

[kunitoki]

Initial implementation of the yup_simd module, providing SIMD-accelerated operations for audio and graphics processing.

Changes Made

• SIMDRegister: Template SIMD register wrapper over xsimd, with type aliases Float4, Float8, Double2, Double4 and support for arithmetic operators, reductions (sum, hmax), mulAdd, aligned/unaligned load and store.
• AffineTransformOperations: SIMD-accelerated 2D affine transform of point arrays (separate and in-place variants).
• ColorVectorOperations: SIMD-accelerated pixel operations — premultiplyARGB, premultiplyRGBA, format conversions (ARGB→RGBA, grayscale→RGBA, RGB→RGBA), and lerpRows.
• ComplexVectorOperations: SIMD-accelerated complex multiplication, multiply-accumulate, and power spectrum (AVX+FMA, SSE, and NEON paths).
• FloatVectorOperations: SIMD-accelerated float/double array operations (add, subtract, multiply, divide, clip, min, max, abs, negate, reductions, conversions, denormal handling).
• Vec2f / Vec4f: Lightweight SIMD-backed vector types for 2D geometry and RGBA colour.

Testing

Comprehensive unit tests added for all classes in tests/yup_simd/, targeting near-100% coverage:

• yup_SIMDRegister.cpp: ~35 tests covering all methods and type aliases including partial batch sizes.
• yup_AffineTransformOperations.cpp: 9 tests with a scalar reference implementation for correctness verification (separate/in-place, identity, translation, scale, edge cases).
• yup_ColorVectorOperations.cpp: 25+ tests covering all conversion functions with edge cases (alpha=0/255, zero-pixel no-ops, lerp at t=0/0.5/1).
• yup_ComplexVectorOperations.cpp: 17 tests covering multiply, multiplyAccumulate, and powerSpectrum with single pairs, unit vectors, Pythagorean triples, and large buffers.
• yup_Vec.cpp: 37 tests for Vec2f and Vec4f covering arithmetic, dot product, length, normalization, lerp, premultiplied alpha, and load/store.
• tests/CMakeLists.txt: yup_simd added to target_modules so all tests are compiled and run.

[codecov]

Codecov Report

❌ Patch coverage is 76.40449% with 105 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.80%. Comparing base (2ae4d72) to head (8d19bd3).

Files with missing lines	Patch %	Lines
...dio_gui/displays/yup_SpectrumAnalyzerComponent.cpp	15.23%	89 Missing ⚠️
modules/yup_graphics/imaging/yup_Image.cpp	0.00%	15 Missing ⚠️
modules/yup_dsp/metering/yup_LevelProcessor.cpp	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
+ Coverage   75.29%   75.80%   +0.50%     
==========================================
  Files         597      602       +5     
  Lines       60462    60841     +379     
==========================================
+ Hits        45527    46121     +594     
+ Misses      14935    14720     -215     

Files with missing lines	Coverage Δ
...audio_gui/displays/yup_SpectrumAnalyzerComponent.h	92.30% <100.00%> (+2.30%)	⬆️
...s/yup_dsp/convolution/yup_PartitionedConvolver.cpp	92.92% <100.00%> (+1.80%)	⬆️
modules/yup_dsp/utilities/yup_DspMath.cpp	100.00% <100.00%> (ø)
modules/yup_graphics/graphics/yup_Color.h	93.93% <ø> (ø)
...ules/yup_graphics/primitives/yup_AffineTransform.h	99.00% <ø> (ø)
...yup_simd/buffers/yup_AffineTransformOperations.cpp	100.00% <100.00%> (ø)
...les/yup_simd/buffers/yup_ColorVectorOperations.cpp	100.00% <100.00%> (ø)
...s/yup_simd/buffers/yup_ComplexVectorOperations.cpp	100.00% <100.00%> (ø)
...les/yup_simd/buffers/yup_FloatVectorOperations.cpp	96.71% <100.00%> (+64.70%)	⬆️
modules/yup_simd/types/yup_SIMDRegister.h	100.00% <100.00%> (ø)
... and 4 more

... and 2 files with indirect coverage changes

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[kunitoki]

@copilot Implement yup_simd module unit tests that are meaningful and that exercise all the changed classes extensively, try to aim at increasing coverage near 100%

[Copilot]

@copilot Implement yup_simd module unit tests that are meaningful and that exercise all the changed classes extensively, try to aim at increasing coverage near 100%

Implemented comprehensive unit tests for all yup_simd classes. Here's what was added (commit Add comprehensive yup_simd unit tests for all classes):

• tests/CMakeLists.txt: Added yup_simd to target_modules so the tests are actually compiled.
• yup_SIMDRegister.cpp: ~35 tests covering default ctor, zero(), broadcast(), element access, arithmetic operators (+, -, *, /, +=, *=), min, max, abs, sum, hmax, mulAdd, aligned/unaligned load/store, all type aliases (Float4, Float8, Double2, Double4), and partial/non-power-of-2 sizes.
• yup_AffineTransformOperations.cpp: 9 tests with a scalar reference helper — separate src/dst, in-place, identity transform, pure translation, pure scale, single point, zero points, large buffer (100 pts), and 3-point scalar tail path.
• yup_ColorVectorOperations.cpp: 25+ tests covering premultiplyARGB/premultiplyRGBA with alpha=0/255/half, convertARGBtoRGBA (in-place, zero pixels, edge cases), convertGrayscaleToRGBA, convertRGBToRGBA, and lerpRows at t=0/0.5/1 and with zero/multiple pixels.
• yup_ComplexVectorOperations.cpp: 17 tests covering multiply (single pair, identity, conjugate, large buffer), multiplyAccumulate (zero input, single pair, large buffer), and powerSpectrum (zero/unit vectors, zero pairs, Pythagorean triples, large buffer).
• yup_Vec.cpp (new): 37 tests for Vec2f (ctor, +, *, dot, length, normalized, zero vector) and Vec4f (ctor, +, scalar *, element-wise *, lerp at 0/0.5/1/0.25, premultiplied with alpha=0/0.5/1, load/store).