[libomptarget] Build a minimal deviceRTL for amdgcn

Summary:
[libomptarget] Build a minimal deviceRTL for amdgcn

The CMakeLists.txt file is functionally identical to the one used in the aomp fork.
Whitespace changes were made based on nvptx/CMakeLists.txt, plus the
copyright notice updated to match (Greg was the original author so would
like his sign off on that here).

This change will build a small subset of the deviceRTL if an appropriate toolchain is
available, e.g. a local install of rocm. Support.h is moved from nvptx as a dependency
of debug.h.

Reviewers: jdoerfert, ABataev, grokos, ronlieb, gregrodgers

Reviewed By: jdoerfert

Subscribers: jfb, Hahnfeld, jvesely, mgorny, openmp-commits

Tags: #openmp

Differential Revision: https://reviews.llvm.org/D70414

1 files changed, 107 insertions, 0 deletions

diff --git a/openmp/libomptarget/deviceRTLs/common/support.h b/openmp/libomptarget/deviceRTLs/common/support.h
new file mode 100644
index 00000000000..8cffd91c9f3
--- /dev/null
+++ b/openmp/libomptarget/deviceRTLs/common/support.h
@@ -0,0 +1,107 @@
+//===--------- support.h - NVPTX OpenMP support functions -------- CUDA -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Wrapper to some functions natively supported by the GPU.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef OMPTARGET_SUPPORT_H
+#define OMPTARGET_SUPPORT_H
+
+#include "interface.h"
+#include "target_impl.h"
+
+////////////////////////////////////////////////////////////////////////////////
+// Execution Parameters
+////////////////////////////////////////////////////////////////////////////////
+enum ExecutionMode {
+  Generic = 0x00u,
+  Spmd = 0x01u,
+  ModeMask = 0x01u,
+};
+
+enum RuntimeMode {
+  RuntimeInitialized = 0x00u,
+  RuntimeUninitialized = 0x02u,
+  RuntimeMask = 0x02u,
+};
+
+DEVICE void setExecutionParameters(ExecutionMode EMode, RuntimeMode RMode);
+DEVICE bool isGenericMode();
+DEVICE bool isSPMDMode();
+DEVICE bool isRuntimeUninitialized();
+DEVICE bool isRuntimeInitialized();
+
+////////////////////////////////////////////////////////////////////////////////
+// Execution Modes based on location parameter fields
+////////////////////////////////////////////////////////////////////////////////
+
+DEVICE bool checkSPMDMode(kmp_Ident *loc);
+DEVICE bool checkGenericMode(kmp_Ident *loc);
+DEVICE bool checkRuntimeUninitialized(kmp_Ident *loc);
+DEVICE bool checkRuntimeInitialized(kmp_Ident *loc);
+
+////////////////////////////////////////////////////////////////////////////////
+// get info from machine
+////////////////////////////////////////////////////////////////////////////////
+
+// get low level ids of resources
+DEVICE int GetThreadIdInBlock();
+DEVICE int GetBlockIdInKernel();
+DEVICE int GetNumberOfBlocksInKernel();
+DEVICE int GetNumberOfThreadsInBlock();
+DEVICE unsigned GetWarpId();
+DEVICE unsigned GetLaneId();
+
+// get global ids to locate tread/team info (constant regardless of OMP)
+DEVICE int GetLogicalThreadIdInBlock(bool isSPMDExecutionMode);
+DEVICE int GetMasterThreadID();
+DEVICE int GetNumberOfWorkersInTeam();
+
+// get OpenMP thread and team ids
+DEVICE int GetOmpThreadId(int threadId,
+                          bool isSPMDExecutionMode);    // omp_thread_num
+DEVICE int GetOmpTeamId();                              // omp_team_num
+
+// get OpenMP number of threads and team
+DEVICE int GetNumberOfOmpThreads(bool isSPMDExecutionMode); // omp_num_threads
+DEVICE int GetNumberOfOmpTeams();                           // omp_num_teams
+
+// get OpenMP number of procs
+DEVICE int GetNumberOfProcsInTeam(bool isSPMDExecutionMode);
+DEVICE int GetNumberOfProcsInDevice(bool isSPMDExecutionMode);
+
+// masters
+DEVICE int IsTeamMaster(int ompThreadId);
+
+// Parallel level
+DEVICE void IncParallelLevel(bool ActiveParallel, __kmpc_impl_lanemask_t Mask);
+DEVICE void DecParallelLevel(bool ActiveParallel, __kmpc_impl_lanemask_t Mask);
+
+////////////////////////////////////////////////////////////////////////////////
+// Memory
+////////////////////////////////////////////////////////////////////////////////
+
+// safe alloc and free
+DEVICE void *SafeMalloc(size_t size, const char *msg); // check if success
+DEVICE void *SafeFree(void *ptr, const char *msg);
+// pad to a alignment (power of 2 only)
+DEVICE unsigned long PadBytes(unsigned long size, unsigned long alignment);
+#define ADD_BYTES(_addr, _bytes)                                               \
+  ((void *)((char *)((void *)(_addr)) + (_bytes)))
+#define SUB_BYTES(_addr, _bytes)                                               \
+  ((void *)((char *)((void *)(_addr)) - (_bytes)))
+
+////////////////////////////////////////////////////////////////////////////////
+// Teams Reduction Scratchpad Helpers
+////////////////////////////////////////////////////////////////////////////////
+DEVICE unsigned int *GetTeamsReductionTimestamp();
+DEVICE char *GetTeamsReductionScratchpad();
+DEVICE void SetTeamsReductionScratchpadPtr(void *ScratchpadPtr);
+
+#endif