KFR 7.2.0

Added

• C API for biquad filter design, window functions, complex and real DFT, convolution and filtering, IIR and FIR filter design, and sample rate conversion
• KFR_INSTALL_LICENSE CMake option to control installation of LICENSE.txt and README.md
• KFR_FORCE_INLINE_MSVC CMake option to enable force inlining with MSVC
• iOS build jobs and kfr.xcframework packaging in the release workflow
• C API tests are now written in C (capi_test.c)

Changed

• [Breaking change] KFR_ENABLE_DFT is now enabled by default for MSVC, as for all other compilers
• [Breaking change] LICENSE.txt and README.md are installed to CMAKE_INSTALL_DOCDIR instead of the installation prefix root
• [Breaking change] cmake/ios.cmake toolchain file removed; iOS is detected with CMAKE_SYSTEM_NAME=iOS
• [Breaking change] Default KFR_ARCHS includes avx512 on 64-bit x86 only
• GCC is supported for non-x86 builds and uses the vector extension backend unless KFR_DISABLE_CLANG_EXTENSIONS is set
• KFR_USE_STD_FILESYSTEM is propagated to consumers as a compile definition
• MSVC: DFT is compiled with /fp:contract /Ob3 /GS- and code generation uses a single thread (/cgthreads1)
• DFT complex multiplication has AVX and AVX2 specializations
• Bit reversal uses rbit on arm64

Fixed

• One-sample windows return 1 for all window types and symmetry modes; symmetric mode previously returned NaN
• linspace with endpoint and size 1 returns start instead of NaN
• countr_zero for 64-bit values on 32-bit MSVC targets
• NEON select mask type casting
• NEON bit reversal
• Component-wise return vectors are initialized with czeros
• Fallback shuffler for MSVC
• Blend functions for SSE4.1 on MSVC
• SIMD fixes for GCC
• MSVC warnings in DFT sources
• C API: DCT plan type references in size and temporary-size functions