diff options
| author | Jonas Hahnfeld <hahnjo@hahnjo.de> | 2017-10-17 13:37:36 +0000 |
|---|---|---|
| committer | Jonas Hahnfeld <hahnjo@hahnjo.de> | 2017-10-17 13:37:36 +0000 |
| commit | 19e976a47167c7239e742fc508d644b714f10016 (patch) | |
| tree | ed6844ba12bf85b853bd28bdd2eb1ad4046ddf5a /CMakeLists.txt | |
| parent | e10677d71bd8243f4e9e3358c7831646644c3860 (diff) | |
| download | clang-19e976a47167c7239e742fc508d644b714f10016.tar.gz | |
[CMake][OpenMP] Customize default offloading arch
For the shuffle instructions in reductions we need at least sm_30
but the user may want to customize the default architecture.
Differential Revision: https://reviews.llvm.org/D38883
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@315996 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'CMakeLists.txt')
| -rw-r--r-- | CMakeLists.txt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index b55c64d9e0..42d580077d 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -235,6 +235,17 @@ endif() set(CLANG_DEFAULT_OPENMP_RUNTIME "libomp" CACHE STRING "Default OpenMP runtime used by -fopenmp.") +# OpenMP offloading requires at least sm_30 because we use shuffle instructions +# to generate efficient code for reductions. +set(CLANG_OPENMP_NVPTX_DEFAULT_ARCH "sm_30" CACHE STRING + "Default architecture for OpenMP offloading to Nvidia GPUs.") +string(REGEX MATCH "^sm_([0-9]+)$" MATCHED_ARCH "${CLANG_OPENMP_NVPTX_DEFAULT_ARCH}") +if (NOT DEFINED MATCHED_ARCH OR "${CMAKE_MATCH_1}" LESS 30) + message(WARNING "Resetting default architecture for OpenMP offloading to Nvidia GPUs to sm_30") + set(CLANG_OPENMP_NVPTX_DEFAULT_ARCH "sm_30" CACHE STRING + "Default architecture for OpenMP offloading to Nvidia GPUs." FORCE) +endif() + set(CLANG_VENDOR ${PACKAGE_VENDOR} CACHE STRING "Vendor-specific text for showing with version information.") |