[llvm-branch-commits] [openmp] 4d0874c - [OpenMP][NVPTX] Added the missing -O1 when building NVPTX bitcode libraries

[Tom Stellard via llvm-branch-commits]

Author: Shilei Tian
Date: 2021-02-03T14:24:51-08:00
New Revision: 4d0874c72a0a3f53eb3084a1ea3ee4456ab6e004

URL: https://github.com/llvm/llvm-project/commit/4d0874c72a0a3f53eb3084a1ea3ee4456ab6e004
DIFF: https://github.com/llvm/llvm-project/commit/4d0874c72a0a3f53eb3084a1ea3ee4456ab6e004.diff

LOG: [OpenMP][NVPTX] Added the missing -O1 when building NVPTX bitcode libraries

In the past `-O1` was used when building NVPTX bitcode libraries. After
we switched to OpenMP, `-O1` was missing by mistake, leading to a huge performance
regression.

Reviewed By: JonChesterfield

Differential Revision: https://reviews.llvm.org/D95545

(cherry picked from commit 5a64794bbad4010778406dfee7748e6080258dbf)

Added: 
    

Modified: 
    openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt

Removed: 
    


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diff  --git a/openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt b/openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt
index 23efbba29d66..eeda137ef120 100644
--- a/openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt
+++ b/openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt
@@ -126,14 +126,14 @@ set(cuda_src_files
 )
 
 # Set flags for LLVM Bitcode compilation.
-set(bc_flags -S -x c++
-              -target nvptx64
-              -Xclang -emit-llvm-bc
-              -Xclang -aux-triple -Xclang ${aux_triple}
-              -fopenmp -fopenmp-cuda-mode -Xclang -fopenmp-is-device
-              -D__CUDACC__
-              -I${devicertl_base_directory}
-              -I${devicertl_nvptx_directory}/src)
+set(bc_flags -S -x c++ -O1 -std=c++14
+             -target nvptx64
+             -Xclang -emit-llvm-bc
+             -Xclang -aux-triple -Xclang ${aux_triple}
+             -fopenmp -fopenmp-cuda-mode -Xclang -fopenmp-is-device
+             -D__CUDACC__
+             -I${devicertl_base_directory}
+             -I${devicertl_nvptx_directory}/src)
 
 if(${LIBOMPTARGET_NVPTX_DEBUG})
   list(APPEND bc_flags -DOMPTARGET_NVPTX_DEBUG=-1)