[dl-cifar] Use -O3 -ffast-math in all versions

Only SYCL version used fast math and only SYCL and HIP used -O3,
whereas CUDA used -O2. This created an unfair comparison between
the programming models.

Align the compilation flags to use -O3 -ffast-math everywhere.

Author: rafbiels

dl-cifar/CUDA/CMakeLists.txt

@@ -34,7 +34,7 @@ option(USE_SM                  "Specifies which streaming multiprocessor archite
 option(DEVICE_TIMER            "Build using Device Timer" OFF)
 
 set(DEF_WL_CXX_FLAGS           " ")
-set(DEF_GENERAL_CXX_FLAGS      " -O2 ")
+set(DEF_GENERAL_CXX_FLAGS      " -O3 -ffast-math ")
 set(DEF_COMBINED_CXX_FLAGS     "${DEF_GENERAL_CXX_FLAGS} ${DEF_WL_CXX_FLAGS}")
 
 set(SOURCES 
@@ -114,4 +114,4 @@ set(CUDA_SEPARABLE_COMPILATION ON)
 message(STATUS "CXX  Compilation flags to: ${CMAKE_CXX_FLAGS}")
 link_libraries(stdc++fs cublas cudnn)
 cuda_add_executable(${PROJECT_NAME} ${SOURCES})
-target_link_libraries(${PROJECT_NAME} ${CUDA_LIBRARIES})
+target_link_libraries(${PROJECT_NAME} ${CUDA_LIBRARIES})

dl-cifar/HIP/CMakeLists.txt

@@ -33,7 +33,7 @@ option(DEVICE_TIMER            "Build using Device Timer" OFF)
 
 
 set(DEF_WL_CXX_FLAGS           " -D__HIP_PLATFORM_AMD__ ")
-set(DEF_GENERAL_CXX_FLAGS      " -Wall -O3 -Wextra ")
+set(DEF_GENERAL_CXX_FLAGS      " -Wall -O3 -ffast-math -Wextra ")
 set(DEF_COMBINED_CXX_FLAGS     "${DEF_GENERAL_CXX_FLAGS} ${DEF_WL_CXX_FLAGS}")