1//===------- Utils.cpp - OpenMP device runtime utility functions -- 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//
10//===----------------------------------------------------------------------===//
11
12#include "DeviceUtils.h"
13
14#include "Debug.h"
15#include "Interface.h"
16#include "Mapping.h"
17#include "gpuintrin.h"
18
19using namespace ompx;
20
21uint64_t utils::pack(uint32_t LowBits, uint32_t HighBits) {
22 return (((uint64_t)HighBits) << 32) | (uint64_t)LowBits;
23}
24
25void utils::unpack(uint64_t Val, uint32_t &LowBits, uint32_t &HighBits) {
26 static_assert(sizeof(unsigned long) == 8, "");
27 LowBits = static_cast<uint32_t>(Val & 0x00000000FFFFFFFFUL);
28 HighBits = static_cast<uint32_t>((Val & 0xFFFFFFFF00000000UL) >> 32);
29}
30
31int32_t utils::shuffle(uint64_t Mask, int32_t Var, int32_t SrcLane,
32 int32_t Width) {
33 return __gpu_shuffle_idx_u32(Mask, SrcLane, Var, Width);
34}
35
36int32_t utils::shuffleDown(uint64_t Mask, int32_t Var, uint32_t Delta,
37 int32_t Width) {
38 int32_t Self = mapping::getThreadIdInWarp();
39 int32_t Index = (Delta + (Self & (Width - 1))) >= Width ? Self : Self + Delta;
40 return __gpu_shuffle_idx_u64(Mask, Index, Var, Width);
41}
42
43int64_t utils::shuffleDown(uint64_t Mask, int64_t Var, uint32_t Delta,
44 int32_t Width) {
45 int32_t Self = mapping::getThreadIdInWarp();
46 int32_t Index = (Delta + (Self & (Width - 1))) >= Width ? Self : Self + Delta;
47 return __gpu_shuffle_idx_u64(Mask, Index, Var, Width);
48}
49
50uint64_t utils::ballotSync(uint64_t Mask, int32_t Pred) {
51 return __gpu_ballot(Mask, Pred);
52}
53
54bool utils::isSharedMemPtr(void *Ptr) { return __gpu_is_ptr_local(Ptr); }
55
56extern "C" {
57int32_t __kmpc_shuffle_int32(int32_t Val, int16_t Delta, int16_t SrcLane) {
58 return utils::shuffleDown(lanes::All, Val, Delta, SrcLane);
59}
60
61int64_t __kmpc_shuffle_int64(int64_t Val, int16_t Delta, int16_t Width) {
62 return utils::shuffleDown(lanes::All, Val, Delta, Width);
63}
64}
65

source code of offload/DeviceRTL/src/DeviceUtils.cpp