What's new in KFR 6

• DFT performance has been improved up to 40% (backported to KFR 5.2.0 branch)
• C API for non x86 architectures
• DSP refactoring with easier initialization
• Multiarchitecture for resampling, FIR and IIR filters
• matrix_transpose: optimized matrix transpose (square/non-square, inplace/out-of-place, real/complex, scalar/vectors)
• CMake config file generation (find_package(KFR CONFIG) support, see installation)
• .npy format support (reading/writing, v1/v2, c/fortran order, real/complex, bigendian/littleendian)
• Multidimensional DFT: real/complex
• inline_vector
• Windows arm64 support
• Emscripten (wasm/wasm64) support

Other changes

• CMake minimum version is 3.12
• Multidimensional reference DFT
• Easier cross compilation to ARM64 on x86_64 macOS
• Automated tests using GitHub Actions (previously Azure Pipelines)
• GCC 7 and 8: emulate missing avx-512 instrinsics
• read_group and write_group
• [❗breaking change] reshape_may_copy and flatten_may_copy in tensor<> allows copying by default
• shape<>::transpose function
• tensor<>::transpose function
• convert_endianess
• DFT, DSP and IO sources have been moved to src/ directory
• Multiarchitecture is enabled by default
• KFR_DFT_NO_NPo2 has been removed (assumed always enabled)
• Tests refactoring
• Some tests moved to tests/internal/
• [❗breaking change] Scalars are now passed by value in expressions (this fixes dangling references in some cases)
• Expression functions should return expression_make_function instead of expression_function
• KFR_WITH_CLANG
• KFR_VERSION CMake variable
• Functions to get module versions (library_version_dft, library_version_dsp etc)
• Exceptions are no longer enforced in MSVC
• kfr::complex removed (use std::complex instead). KFR_STD_COMPLEX cmake variable removed too
• strides_for_shape for fortran order
• AARCH and ARM emulation refactoring (dynamic libraries are now supported)
• call_with_temp
• maximum_dims is now 16 (was 8)
• to_fmt/from_fmt supports inplace
• shape refactoring: rotate_left, rotate_right, remove_back, remove_front
• temp argument can be nullptr for DFT (temporary buffer will be allocated on stack or heap)
• dft_plan and similar classes have now default and move constructors
• -DCMAKE_POSITION_INDEPENDENT_CODE=ON is required for building C API
• ci/run.sh can now build in a directory outside source tree
• [❗breaking change]graphics/color.hpp and graphics/geometry.hpp have been removed
• Simpler CMT_CVAL macro
• /Zc:lambda is now required for building KFR in MSVC
• println for string_view
• MSVC internal compiler error fixed
• Complex vector operators fixed