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| 1 | //===-- Shared/Utils.h - Target independent OpenMP target RTL -- C++ ------===// |
|---|---|
| 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 | // Routines and classes used to provide useful functionalities for the host and |
| 10 | // the device. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #ifndef OMPTARGET_SHARED_UTILS_H |
| 15 | #define OMPTARGET_SHARED_UTILS_H |
| 16 | |
| 17 | #include <stdint.h> |
| 18 | |
| 19 | namespace utils { |
| 20 | |
| 21 | /// Return the difference (in bytes) between \p Begin and \p End. |
| 22 | template <typename Ty = char> |
| 23 | auto getPtrDiff(const void *End, const void *Begin) { |
| 24 | return reinterpret_cast<const Ty *>(End) - |
| 25 | reinterpret_cast<const Ty *>(Begin); |
| 26 | } |
| 27 | |
| 28 | /// Return \p Ptr advanced by \p Offset bytes. |
| 29 | template <typename Ty1, typename Ty2> Ty1 *advancePtr(Ty1 *Ptr, Ty2 Offset) { |
| 30 | return (Ty1 *)(const_cast<char *>((const char *)(Ptr)) + Offset); |
| 31 | } |
| 32 | |
| 33 | /// Return \p V aligned "upwards" according to \p Align. |
| 34 | template <typename Ty1, typename Ty2> inline Ty1 alignPtr(Ty1 V, Ty2 Align) { |
| 35 | return reinterpret_cast<Ty1>(((uintptr_t(V) + Align - 1) / Align) * Align); |
| 36 | } |
| 37 | |
| 38 | /// Round up \p V to a \p Boundary. |
| 39 | template <typename Ty> inline Ty roundUp(Ty V, Ty Boundary) { |
| 40 | return alignPtr(V, Boundary); |
| 41 | } |
| 42 | |
| 43 | /// Return the first bit set in \p V. |
| 44 | inline uint32_t ffs(uint32_t V) { |
| 45 | static_assert(sizeof(int) == sizeof(uint32_t), "type size mismatch"); |
| 46 | return __builtin_ffs(V); |
| 47 | } |
| 48 | |
| 49 | /// Return the first bit set in \p V. |
| 50 | inline uint32_t ffs(uint64_t V) { |
| 51 | static_assert(sizeof(long) == sizeof(uint64_t), "type size mismatch"); |
| 52 | return __builtin_ffsl(V); |
| 53 | } |
| 54 | |
| 55 | /// Return the number of bits set in \p V. |
| 56 | inline uint32_t popc(uint32_t V) { |
| 57 | static_assert(sizeof(int) == sizeof(uint32_t), "type size mismatch"); |
| 58 | return __builtin_popcount(V); |
| 59 | } |
| 60 | |
| 61 | /// Return the number of bits set in \p V. |
| 62 | inline uint32_t popc(uint64_t V) { |
| 63 | static_assert(sizeof(long) == sizeof(uint64_t), "type size mismatch"); |
| 64 | return __builtin_popcountl(V); |
| 65 | } |
| 66 | |
| 67 | } // namespace utils |
| 68 | |
| 69 | #endif // OMPTARGET_SHARED_UTILS_H |
| 70 |
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