1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <__algorithm/min.h> 10 #include <__algorithm/pstl_backends/cpu_backends/libdispatch.h> 11 #include <__config> 12 #include <dispatch/dispatch.h> 13 14 _LIBCPP_BEGIN_NAMESPACE_STD 15 16 namespace __par_backend::inline __libdispatch { 17 18 void __dispatch_apply(size_t chunk_count, void* context, void (*func)(void* context, size_t chunk)) noexcept { 19 ::dispatch_apply_f(chunk_count, DISPATCH_APPLY_AUTO, context, func); 20 } 21 22 __chunk_partitions __partition_chunks(ptrdiff_t element_count) noexcept { 23 __chunk_partitions partitions; 24 partitions.__chunk_count_ = std::max<ptrdiff_t>(1, element_count / 256); 25 partitions.__chunk_size_ = element_count / partitions.__chunk_count_; 26 partitions.__first_chunk_size_ = element_count - (partitions.__chunk_count_ - 1) * partitions.__chunk_size_; 27 if (partitions.__chunk_count_ == 0 && element_count > 0) 28 partitions.__chunk_count_ = 1; 29 return partitions; 30 } 31 32 // NOLINTNEXTLINE(llvm-namespace-comment) // This is https://llvm.org/PR56804 33 } // namespace __par_backend::inline __libdispatch 34 35 _LIBCPP_END_NAMESPACE_STD 36