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CHANGELOG.md

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Changelog

This is a list of notable changes to libdivide.

3.1 - not yet released

  • ENHANCEMENT
    • Add fuzzing support (requires clang) (#60)

3.0 - 2019-10-16

  • BREAKING
    • libdivide.h now requires C++11 or later
  • BUG FIXES
    • Support all 32-bit and 64-bit integer types in C++ (#58)
    • Fix cross compilation (#59)
  • ENHANCEMENT
    • Add support for CMake find_package(libdivide)

2.0 - 2019-06-22

  • BREAKING
    • Removed unswitch functionality (#46)
    • Renamed macro LIBDIVIDE_USE_SSE2 to LIBDIVIDE_SSE2
    • Renamed divider::recover_divisor() to divider::recover()
  • BUG FIXES
    • Remove _udiv128() as not yet supported by clang-cl and icl compilers
    • Fix C++ linker issue caused by anonymous namespace (#54)
    • Fix clang-cl (Windows) linker issue (#56)
  • ENHANCEMENT
    • Add AVX2 & AVX512 vector division
    • Speed up SSE2 libdivide_mullhi_u64_vector()
    • Support +1 & -1 signed branchfree dividers (4a1d5a7)
    • Speed up unsigned branchfull power of 2 dividers (2422199)
    • Simplify C++ templates
    • Simplify more bit flags of the libdivide_*_t structs
    • Get rid of MAYBE_VECTOR() hack
  • TESTING
    • tester.cpp: Convert to modern C++
    • tester.cpp: Add more test cases
    • benchmark_branchfreee.cpp: Convert to modern C++
    • benchmark.c: Prevent compilers from optmizing too much
  • BUILD
    • Automatically detect SSE2/AVX2/AVX512
  • DOCS

1.1 - 2019-05-29

  • BUG FIXES
    • Fix bug in libdivide_128_div_64_to_64() (#45)
    • Fix MSVC ARM 64-bit bug (07931e9)
    • Fix -Wshift-count-overflow warning on avr CPU architecture (#41)
    • Fix -Wshadow warning in libdivide_s32_do()
    • Fix -Wignored-attributes warnings when compiling SSE2 code using GCC 9
  • ENHANCEMENT
    • libdivide_128_div_64_to_64(): optimize using _udiv128() for MSVC 2019 or later
    • libdivide_128_div_64_to_64(): optimize using __uint128_t for GCC/Clang on 64-bit CPU architectures
    • Add LIBDIVIDE_VERSION macro to libdivide.h
    • Clean up SSE2 code in libdivide.h
    • Increase runtime of test cases in primes_benchmark.cpp
  • BUILD
    • Remove windows directory with legacy Visual Studio project files
    • Move test programs to test directory

1.0 - 2018-01-21

  • BREAKING
    • Branchfull divider must not be 0 (#38)
    • Branchfree divider must not be -1, 0, 1 (#38)
  • ENHANCEMENT
    • Add proper error handling (#38)
    • Add C++ support for /= operator
    • Speedup 64-bit divisor recovery by up to 30%
    • Simplify C++ templates
    • Add include guards to libdivide.h!
    • Get rid of goto in libdivide_128_div_64_to_64()
    • Use #if defined(MACRO) instead of #if MACRO
    • Silence compiler warnings from crash functions
  • TESTING
    • Tests should exit(1) on error, required by make test
    • Silence unused parameter warnings
    • Silence GCC 7.2.0 maybe uninitialized warnings
    • Silence unused return value warning
  • BUILD
    • Port build system from make to CMake
    • Automatically detect if the CPU and compiler support SSE2
    • Automatically enable C++11
  • DOCS
    • Update build instructions in README.md
    • Update benchmark section with branchfree divider
    • Add C example section
    • Add C++ example section
    • Add "Branchfull vs branchfree" section
    • Add section about unswitching
    • New CHANGELOG.mdfile