commit | 98c796cce62914b4f4b5d9baca853350b3565a69 | [log] [tgz] |
---|---|---|
author | Louis Dionne <ldionne@apple.com> | Thu Jun 20 17:56:51 2019 +0000 |
committer | Copybara-Service <copybara-worker@google.com> | Tue Sep 01 14:42:50 2020 -0700 |
tree | 40303cf45728a58822e87d5fa6c4dbd80f246973 | |
parent | 0f2d1499975babfd9306d7194865c1bb5b971fbf [diff] |
[pstl] Default to the serial backend when unspecified This is a stopgap measure to make it easier to integrate the PSTL into libc++. In the future, we should have a system similar to what libc++ does, where we specify settings at configuration time and generate a __config_site header that is part of the PSTL. llvm-svn: 363958 GitOrigin-RevId: 04c5bc989a31b81bd7dda1f3e53de2930c8c7ec0
Parallel STL is an implementation of the C++ standard library algorithms with support for execution policies, as specified in ISO/IEC 14882:2017 standard, commonly called C++17. The implementation also supports the unsequenced execution policy specified in Parallelism TS version 2 and proposed for the next version of the C++ standard in the C++ working group paper P1001. Parallel STL offers efficient support for both parallel and vectorized execution of algorithms. For sequential execution, it relies on an available implementation of the C++ standard library.
To use Parallel STL, you must have the following software installed:
unseq
and par_unseq
policies only have effect with compilers that support #pragma omp simd
or #pragma simd
.includes
, inplace_merge
, merge
, nth_element
, partial_sort
, partial_sort_copy
, set_difference
, set_intersection
, set_symmetric_difference
, set_union
, sort
, stable_partition
, stable_sort
, unique
.exclusive_scan
, inclusive_scan
, transform_exclusive_scan
, transform_inclusive_scan
shall be DefaultConstructible. A default constructed-instance of the initial value type shall be the identity element for the specified binary operation.max_element
, min_element
, minmax_element
, partial_sort
, partial_sort_copy
, sort
, stable_sort
the dereferenced value type of the provided iterators shall be DefaultConstructible.remove
, remove_if
, unique
the dereferenced value type of the provided iterators shall be MoveConstructible.copy_if
, inplace_merge
, partial_sort
, partial_sort_copy
, partition_copy
, remove
, remove_if
, rotate
, sort
, stable_sort
, unique
, unique_copy
.