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[libomptarget] Change nvcc compilation to use a unity build

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Summary:
[libomptarget] Change nvcc compilation to use a unity build

This allows nvcc to inline functions between what would otherwise be distinct
translation units, which in turn removes any runtime cost from implementing
functions in source files (as opposed to inline in headers).

This will then allow the circular dependencies in deviceRTL to be readily
broken and individual components more easily shared between architectures.

Reviewers: ABataev, jdoerfert, grokos, RaviNarayanaswamy, hfinkel, ronlieb, gregrodgers

Reviewed By: jdoerfert

Subscribers: mgorny, openmp-commits

Tags: #openmp

Differential Revision: https://reviews.llvm.org/D69489
This commit is contained in:
Jon Chesterfield 2019-10-31 01:58:29 +00:00 committed by JonChesterfield
parent 0be9cf2da9
commit e9f9dfab82
2 changed files with 26 additions and 1 deletions
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2
openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt
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@ -88,7 +88,7 @@ if(LIBOMPTARGET_DEP_CUDA_FOUND)
set(BUILD_SHARED_LIBS OFF)
set(CUDA_SEPARABLE_COMPILATION ON)
list(APPEND CUDA_NVCC_FLAGS -I${devicertl_base_directory})
cuda_add_library(omptarget-nvptx STATIC ${cuda_src_files} ${omp_data_objects}
cuda_add_library(omptarget-nvptx STATIC unity.cu
OPTIONS ${CUDA_ARCH} ${CUDA_DEBUG})
# Install device RTL under the lib destination folder.

25
openmp/libomptarget/deviceRTLs/nvptx/unity.cu Normal file
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@ -0,0 +1,25 @@
//===------ unity.cu - Unity build of NVPTX deviceRTL ------------ 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
//
//===----------------------------------------------------------------------===//
//
// Support compilers, specifically NVCC, which have not implemented link time
// optimisation. This removes the runtime cost of moving inline functions into
// source files in exchange for preventing efficient incremental builds.
//
//===----------------------------------------------------------------------===//
#include "src/cancel.cu"
#include "src/critical.cu"
#include "src/data_sharing.cu"
#include "src/libcall.cu"
#include "src/loop.cu"
#include "src/omp_data.cu"
#include "src/omptarget-nvptx.cu"
#include "src/parallel.cu"
#include "src/reduction.cu"
#include "src/sync.cu"
#include "src/task.cu"