| //===-- Utilities for pairs of numbers. -------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIBC_SRC_SUPPORT_NUMBER_PAIR_H |
| #define LLVM_LIBC_SRC_SUPPORT_NUMBER_PAIR_H |
| |
| #include "CPP/type_traits.h" |
| #include "named_pair.h" |
| |
| #include <stddef.h> |
| |
| namespace __llvm_libc { |
| |
| DEFINE_NAMED_PAIR_TEMPLATE(NumberPair, lo, hi); |
| |
| template <typename T> |
| cpp::enable_if_t<cpp::is_integral_v<T> && cpp::is_unsigned_v<T>, NumberPair<T>> |
| split(T a) { |
| constexpr size_t HALF_BIT_WIDTH = sizeof(T) * 4; |
| constexpr T LOWER_HALF_MASK = (T(1) << HALF_BIT_WIDTH) - T(1); |
| NumberPair<T> result; |
| result.lo = a & LOWER_HALF_MASK; |
| result.hi = a >> HALF_BIT_WIDTH; |
| return result; |
| } |
| |
| } // namespace __llvm_libc |
| |
| #endif // LLVM_LIBC_SRC_SUPPORT_NUMBER_PAIR_H |
