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[pstl] Improve the parallel version of std::equal

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When an execution policy is provided, we attempt to run std::equal in
parallel instead of always doing it serially.

Thanks to Mikhail Dvorskiy for the patch.

Differential Revision: https://reviews.llvm.org/D59813

llvm-svn: 357613
This commit is contained in:
Louis Dionne 2019-04-03 17:34:57 +00:00
parent 35ccd864e0
commit 8a497a958b
2 changed files with 62 additions and 4 deletions
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57
pstl/include/pstl/internal/algorithm_impl.h
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@ -406,6 +406,63 @@ __pattern_walk3(_ExecutionPolicy&& __exec, _RandomAccessIterator1 __first1, _Ran
// equal
//------------------------------------------------------------------------
template <class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate>
bool
__brick_equal(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2,
_ForwardIterator2 __last2, _BinaryPredicate __p, /* IsVector = */ std::false_type) noexcept
{
return std::equal(__first1, __last1, __first2, __last2, __p);
}
template <class _RandomAccessIterator1, class _RandomAccessIterator2, class _BinaryPredicate>
bool
__brick_equal(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1, _RandomAccessIterator2 __first2,
_RandomAccessIterator2 __last2, _BinaryPredicate __p, /* is_vector = */ std::true_type) noexcept
{
if (__last1 - __first1 != __last2 - __first2)
return false;
return __unseq_backend::__simd_first(__first1, __last1 - __first1, __first2,
__internal::__not_pred<_BinaryPredicate>(__p))
.first == __last1;
}
template <class _ExecutionPolicy, class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate,
class _IsVector>
bool
__pattern_equal(_ExecutionPolicy&&, _ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2,
_ForwardIterator2 __last2, _BinaryPredicate __p, _IsVector __is_vector, /* is_parallel = */
std::false_type) noexcept
{
return __internal::__brick_equal(__first1, __last1, __first2, __last2, __p, __is_vector);
}
#if __PSTL_USE_PAR_POLICIES
template <class _ExecutionPolicy, class _RandomAccessIterator1, class _RandomAccessIterator2, class _BinaryPredicate,
class _IsVector>
bool
__pattern_equal(_ExecutionPolicy&& __exec, _RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1,
_RandomAccessIterator2 __first2, _RandomAccessIterator2 __last2, _BinaryPredicate __p,
_IsVector __is_vector, /*is_parallel=*/std::true_type)
{
if (__last1 - __first1 != __last2 - __first2)
return false;
return __internal::__except_handler([&]() {
return !__internal::__parallel_or(
std::forward<_ExecutionPolicy>(__exec), __first1, __last1,
[__first1, __first2, __p, __is_vector](_RandomAccessIterator1 __i, _RandomAccessIterator1 __j) {
return !__internal::__brick_equal(__i, __j, __first2 + (__i - __first1), __first2 + (__j - __first1),
__p, __is_vector);
});
});
}
#endif
//------------------------------------------------------------------------
// equal version for sequences with equal length
//------------------------------------------------------------------------
template <class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate>
bool
__brick_equal(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2, _BinaryPredicate __p,

9
pstl/include/pstl/internal/glue_algorithm_impl.h
View File

@ -745,10 +745,11 @@ __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, bool>
equal(_ExecutionPolicy&& __exec, _ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2,
_ForwardIterator2 __last2, _BinaryPredicate __p)
{
if (std::distance(__first1, __last1) == std::distance(__first2, __last2))
return std::equal(__first1, __last1, __first2, __p);
return false;
using namespace __pstl;
return __internal::__pattern_equal(
std::forward<_ExecutionPolicy>(__exec), __first1, __last1, __first2, __last2, __p,
__internal::__is_vectorization_preferred<_ExecutionPolicy, _ForwardIterator1>(__exec),
__internal::__is_parallelization_preferred<_ExecutionPolicy, _ForwardIterator1>(__exec));
}
template <class _ExecutionPolicy, class _ForwardIterator1, class _ForwardIterator2>