Vc 1.4.5

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.4.5 is a bugfix release most notably incorporating fixes for current compiler versions.

What's Changed

• Small CMake improvements by @gruenich in #360
• Replace uses exec_program with execute_process by @pikacic in #364

New Contributors

• @gruenich made their first contribution in #360
• @pikacic made their first contribution in #364

Full Changelog: 1.4.4...1.4.5

Vc 1.4.4

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.4.4 is a bugfix release most notably incorporating fixes for current compiler versions.

User Changelog

Resolved Issues

• Add missing vectorcall to isImplementationSupported by @bernhardmgruber in #347
• Adapt to cpp17: std::iterator is deprecated by @dpiparo in #356
• Rename None to NoTransformation in enum class Category to avoid a clash with X11 library by @dkonst13 in #354
• Fix horizontal min/max for uchar by @bernhardmgruber in #350
• Regenerate godbolt headers by @bernhardmgruber in #357

New Contributors

• @dpiparo made their first contribution in #356
• @dkonst13 made their first contribution in #354

Full Changelog: 1.4.3...1.4.4

Developer Changelog

Vc 1.4.3

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.4.3 is a bugfix release most notably incorporating fixes for current compiler versions.

User Changelog

Resolved Issues

• Fix integer comparison warning by @bernhardmgruber in #281
• Fix vector call linking with trigonometric functions by @EricAtORS in #274
• Allow consumption in subprojects by @Corristo in #271
• Support GCC standard libraries which do not define __GLIBC_PREREQ by @bernhardmgruber in #282
• Vector: add index_type alias by @amyspark in #285
• Add github actions CI inspired by travis/appveyor scripts by @bernhardmgruber in #278
• Require at least VS2015 by @bernhardmgruber in #290
• MSVC: specify Vc_VDECL explicitly on a few functions by @amyspark in #291
• Treat GitHub Actions CI like travis/appveyor CI by @bernhardmgruber in #297
• Remove appveyor and travis CI by @bernhardmgruber in #293
• exp: adjust boundaries for single-precision floating point by @amyspark in #295
• Retrieve MSVC version from cl.exe by @bernhardmgruber in #298
• Vector: add constructor taking an element reference by @amyspark in #286
• Fix MaskBool initialization on SSE by @amyspark in #300
• Update godbolt headers by @bernhardmgruber in #305
• Add Vc_INTRINSIC to fixed_size_simd operators by @bmanga in #309
• Add nighly builds by @bernhardmgruber in #314
• Support AMD zen3 by @bernhardmgruber in #317
• Remove custom offsetof implementation by @hahnjo in #313
• Add clang-12 to CI by @bernhardmgruber in #315
• Fix zen3 flags for icc and support icelake by @bernhardmgruber in #321
• Add VS2019 to CI by @bernhardmgruber in #294
• Update README by @bernhardmgruber in #324
• CMake: add x86-64 feature levels by @stephanlachnit in #326
• Don't build tests by default by @bernhardmgruber in #325
• Add g++-11 to CI by @bernhardmgruber in #318
• Drop VS2017 by @bernhardmgruber in #328
• CMakeLists.txt: use CMAKE_CURRENT_LIST_DIR for module path by @htfy96 in #302
• Minor fixes for Intel C/C++ compilers by @amadio in #330
• Disable ctest submit by @bernhardmgruber in #336
• Make godbolt headers have all of Vc by @bernhardmgruber in #333
• Default to Vc_RECURSIVE_MEMORY 1 by @bernhardmgruber in #334
• Avoid assertion with MS STL in debug mode by @bernhardmgruber in #337
• Avoid Intel specific flags with icc by @bernhardmgruber in #322
• Fix out of bounds index when float_v is scalar by @bernhardmgruber in #340
• Run debug builds in CI by @bernhardmgruber in #338
• Revert "disable submitting to cdash" by @bernhardmgruber in #342
• Update README.md by @bernhardmgruber in #341
• Add maintenance mode warning to issue template by @bernhardmgruber in #344
• Fix warning on using TimeStampCounter uninitialized by @bernhardmgruber in #343

New Contributors

• @EricAtORS made their first contribution in #274
• @Corristo made their first contribution in #271
• @amyspark made their first contribution in #285
• @bmanga made their first contribution in #309
• @stephanlachnit made their first contribution in #326
• @htfy96 made their first contribution in #302

Full Changelog: 1.4.2...1.4.3

Developer Changelog

Vc 1.4.2

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.4.2 is a bugfix release most notably incorporating fixes for current compiler versions.

User Changelog

Resolved Issues

	description
	Fixed a warning from cmake. (see #276)
	Added a missing include for GCC11. (see #275)
	Fixed a compilation error with MSVC. (see #272, #277)
	Fixed a corner case in the unit tests. (see #262)
	Fixed a warning in the unit tests. (see #261)
	Fixed a unit test compilation error with clang. (see #260)
	Removed the deprecated Vector<T, VectorAbi::Scalar>::reinterpretCast to fix a warning with GCC10. (see #254)
	Avoid potentially pessimizing std::move in return statements. (see #258)
	Avoid redefinition of bit_scan{forward,reverse} macros. (see #248
	Improved performance of simized random access containers.
	Documentation and CI cleanup. (see #222, #223, #251, #259)

Developer Changelog

Vc 1.4.1

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.4.1 is a bugfix release most notably incorporating improved codegen on gathers with AVX2 available.

User Changelog

Resolved Issues

	description
	Gather operations that required implicit multiplication of the index vector (because of gather into an array of structure) will now do a more efficient vector multiplication or, if possible, use a larger stride in the gather instruction to avoid the multiplication (see #214)
	Internal code cleanup (removal of dead code) to hit fewer compilation corner cases/errors.
	Buildsystem fixes for i686 and libmvec.

Developer Changelog

Vc 1.4.0

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.4.0 is a minor feature release with subtle changes in the interface and the start of an upgrade path to std::experimental::simd.

User Changelog

	description
	Dropped all Intel MIC code. This was not AVX512, but the old KNC implementation. ICC 18 dropped support for the -mmic compile flag. Consequently, I removed the maintenance burden.
	Vc::simdize<T, N> (with arithmetic T and suitable N) can now be an alias for Vc::Vector<T, Sse>, while AVX(2) is available. In Vc 1.3, this would use Vc::SimdArray<T, N> instead.
	Fixed conversions from Vc::Vector<T> to Vc::SimdArray<U, Vc::Vector<T>::size()> to be implicit (as the documentation always said).
	Added Vc::simd<T, Abi> alias that resolves to the corresponding Vc::Vector or Vc::SimdArray type. Most importantly Vc::simd<T, Vc::simd_abi::fixed_size<N>> (alias: Vc::fixed_size_simd<T, N>) will give you (almost) Vc::SimdArray<T, N>. Note that this simd type does not implement the exact same interface as defined in the Parallelism TS v2. Most SimdArray operations return fixed_size_simd now, thus potentially breaking existing code (e.g. by breaking template argument deduction).
	Added load_interleaved and store_interleaved to be used with Vc::simdize<T> objects. This enables optimized loads from / stores to an AoS (array of structure) layout into/from structs of Vc vectors. This is currently only optimized for structures T where all data members have equal sizeof.
	Added a new constructor to simdized types: Vc::simdize<T>([](size_t n) { ... }) expects the lambda to return objects of type T, which will be placed at the corresponding index n in the resulting object.
	Vc::simd_for_each and Vc::simd_for_each_n will now vectorize any value_type via Vc::simdize. In Vc 1.3, only arithmetic types were vectorized, everything else used a fall-back to std::for_each. This fallback is removed in Vc 1.4. Consequently, the value_type must work with Vc::simdize.
	The sin, cos, and sincos functions now have increased precision at the cost of lower performance (with AVX2, you still get a speedup of ~8 over std::sin and std::cos). There's an option to use libmvec for Vc::sin and Vc::cos, which gives even higher performance for SSE4 and AVX2, but less performance for targets without SSE4 or just AVX.
	Modernize CMake to simplify usage of Vc in external projects via exported target.
	Binary operators are now stricter in the implicit conversions they allow. E.g. simd<int>(0) == 0l is now ill-formed. Because it would require a silent (potentially) narrowing conversion of the right hand side.

Developer Changelog

Vc 1.3.3

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.3.3 is a minor bug fix release.

User Changelog

• Support for AVX2 gather instructions. Thanks to Kay F. Jahnke for the initial patch.
• Shift optimizations
• Preliminary support for compiling to non-x86 targets (uses only the Scalar ABI)
• Resolve failing static assertions, moving the relevant tests to unit tests
• Fixed is_simd_vector and is_simd_mask traits to consider the ElementType too. Thanks to Kay F. Jahnke.

Developer Changelog

Vc 1.3.2

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.3.2 is a small bug fix release.

User Changelog

• Resolve warnings from GCC 6 about ignored attributes.
• Support for Kaby Lake detection.

Developer Changelog

Vc 1.3.1

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.3.1 contains bug fixes, enables swap on scalar subscripts, and resolves a licensing issue in the examples.

User Changelog

• swap(v[i], v[j]) did not compile. Vc 1.3.1 overloads the swap function and thus enables swapping scalars into/out of vector and mask objects.
• The spline example has moved to the new Vc-examples-nonfree repository since it has a license that restricts redistribution.

Developer Changelog

Vc 1.3.0

Vc is an open source library to ease explicit vectorization of C++ code. It has an intuitive API and provides portability between different compilers and compiler versions as well as portability between different vector instruction sets.

Vc 1.3.0 contains API cleanups, bug fixes, important compiler-specific optimizations & workarounds, and finally supports MSVC again

User Changelog

• 64-bit MS VisualStudio 2015 support. (See #119 for some of the gory details.)
• ICC 17 support (#143).
• GCC 6 support (#125).
• Workarounds for bad ICC code-gen (#135). Now Vc not only works correctly when compiled with ICC, but also performs as good (or better) as GCC and Clang.
• Safer and more restrictive subscripting on Vector and Mask. There is a minor source compatibility break involved, since Vector::operator[] returned lvalue references before Vc 1.3 and returns a smart reference (rvalue) now. This change reduces the chance of miscompilation & internal compiler errors and reduces the reliance on non-standard C++ extensions.
• Support for x32 compilation (like x86_64 but with 32-bit pointers).
• Added scatter interface to SimdArray (thanks to Kay Jahnke).
• simd_cast properly works with ADL now (i.e. you don't have to write fully qualified Vc::simd_cast anymore).
• Added simd_for_each_n (thanks to Hartmut Kaiser).

Developer Changelog