Author: grokos Date: Thu Dec 7 12:27:31 2017 New Revision: 320082 URL: http://llvm.org/viewvc/llvm-project?rev=320082&view=rev Log: [OpenMP] NVPTX: Set default/minimum compute capability to sm_35
The current implementation of the nvptx runtime (to be upstreamed shortly) uses the atomicMax operation on 64-bit integers. This is only supported in compute capabilities 3.5 and later. I've changed the clang default to sm_35. Differential Revision: https://reviews.llvm.org/D40977 Modified: cfe/trunk/CMakeLists.txt Modified: cfe/trunk/CMakeLists.txt URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/CMakeLists.txt?rev=320082&r1=320081&r2=320082&view=diff ============================================================================== --- cfe/trunk/CMakeLists.txt (original) +++ cfe/trunk/CMakeLists.txt Thu Dec 7 12:27:31 2017 @@ -241,14 +241,15 @@ set(CLANG_DEFAULT_OBJCOPY "objcopy" CACH 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 +# OpenMP offloading requires at least sm_35 because we use shuffle instructions +# to generate efficient code for reductions and the atomicMax instruction on +# 64-bit integers in the implementation of conditional lastprivate. +set(CLANG_OPENMP_NVPTX_DEFAULT_ARCH "sm_35" 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 "${CMAKE_MATCH_1}" LESS 30) - message(WARNING "Resetting default architecture for OpenMP offloading to Nvidia GPUs to sm_30") - set(CLANG_OPENMP_NVPTX_DEFAULT_ARCH "sm_30" CACHE STRING +if (NOT DEFINED MATCHED_ARCH OR "${CMAKE_MATCH_1}" LESS 35) + message(WARNING "Resetting default architecture for OpenMP offloading to Nvidia GPUs to sm_35") + set(CLANG_OPENMP_NVPTX_DEFAULT_ARCH "sm_35" CACHE STRING "Default architecture for OpenMP offloading to Nvidia GPUs." FORCE) endif() _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
