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[PGO][OpenMP] Instrumentation for GPU devices (Revision of #76587) (#102691)

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This pull request is a revised version of #76587. This pull request
fixes some build issues that were present in the previous version of
this change.

> This pull request is the first part of an ongoing effort to extends
PGO instrumentation to GPU device code. This PR makes the following
changes:
>
> - Adds blank registration functions to device RTL
> - Gives PGO globals protected visibility when targeting a supported
GPU
> - Handles any addrspace casts for PGO calls
> - Implements PGO global extraction in GPU plugins (currently only
dumps info)
>
> These changes can be tested by supplying `-fprofile-instrument=clang`
while targeting a GPU.
This commit is contained in:
Ethan Luis McDonough
2024-08-22 01:10:54 -05:00
committed by GitHub
parent ded6dd244c
commit fde2d23ee2
17 changed files with 357 additions and 28 deletions
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2
offload/DeviceRTL/CMakeLists.txt
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@@ -77,6 +77,7 @@ set(include_files
${include_directory}/Interface.h
${include_directory}/LibC.h
${include_directory}/Mapping.h
${include_directory}/Profiling.h
${include_directory}/State.h
${include_directory}/Synchronization.h
${include_directory}/Types.h
@@ -93,6 +94,7 @@ set(src_files
${source_directory}/Mapping.cpp
${source_directory}/Misc.cpp
${source_directory}/Parallelism.cpp
${source_directory}/Profiling.cpp
${source_directory}/Reduction.cpp
${source_directory}/State.cpp
${source_directory}/Synchronization.cpp

21
offload/DeviceRTL/include/Profiling.h Normal file
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@@ -0,0 +1,21 @@
//===-------- Profiling.h - OpenMP interface ---------------------- 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 OMPTARGET_DEVICERTL_PROFILING_H
#define OMPTARGET_DEVICERTL_PROFILING_H
extern "C" {
void __llvm_profile_register_function(void *Ptr);
void __llvm_profile_register_names_function(void *Ptr, long int I);
void __llvm_profile_instrument_memop(long int I, void *Ptr, int I2);
}
#endif

22
offload/DeviceRTL/src/Profiling.cpp Normal file
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@@ -0,0 +1,22 @@
//===------- Profiling.cpp ---------------------------------------- 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
//
//===----------------------------------------------------------------------===//
#include "Profiling.h"
#pragma omp begin declare target device_type(nohost)
extern "C" {
// Provides empty implementations for certain functions in compiler-rt
// that are emitted by the PGO instrumentation.
void __llvm_profile_register_function(void *Ptr) {}
void __llvm_profile_register_names_function(void *Ptr, long int I) {}
void __llvm_profile_instrument_memop(long int I, void *Ptr, int I2) {}
}
#pragma omp end declare target