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35 # OpenCL required version: 1.2 or newer
36 set(REQUIRED_SYCL_MIN_VERSION_MAJOR 1)
37 set(REQUIRED_SYCL_MIN_VERSION_MINOR 2)
38 set(REQUIRED_SYCL_MIN_VERSION ${REQUIRED_SYCL_MIN_VERSION_MAJOR}.${REQUIRED_SYCL_MIN_VERSION_MINOR})
42 # CMake issue tracking the efforts to make a universal upstream module:
43 # https://gitlab.kitware.com/cmake/cmake/-/issues/21711
45 option(GMX_SYCL_HIPSYCL "Use hipSYCL instead of Intel/Clang for SYCL compilation" OFF)
48 message(FATAL_ERROR "SYCL acceleration is not available in double precision")
51 include(gmxFindFlagsForSource)
54 if(NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")
55 message(FATAL_ERROR "hipSYCL can only be built with Clang++ compiler")
57 set(HIPSYCL_CLANG "${CMAKE_CXX_COMPILER}")
58 # -Wno-unknown-cuda-version because Clang-11 complains about CUDA 11.0-11.2, despite working fine with them.
59 # -Wno-unknown-attributes because hipSYCL does not support reqd_sub_group_size (because it can only do some sub group sizes).
60 # --hipsycl-explicit-multipass is needed when building for both CUDA and HIP.
61 set(HIPSYCL_SYCLCC_EXTRA_ARGS "-Wno-unknown-cuda-version -Wno-unknown-attributes --hipsycl-explicit-multipass")
62 find_package(hipsycl REQUIRED)
64 if(CMAKE_CXX_COMPILER MATCHES "dpcpp")
65 # At least Intel dpcpp defaults to having SYCL enabled for all code. This leads to two problems:
67 # 1. Compiles take ~3x longer, since every file has to be compiled for multiple targets.
68 # 2. We get a ton of warnings for the device-specific pass when the compiler sees our SIMD code.
70 # To avoid this, we attempt to find a flag to disable SYCL for non-SYCL files. Unfortunately,
71 # when using gmx_find_flag_for_source() that includes calling check_cxx_compiler_flag(),
72 # this in turn exposes a bug in dpcpp, where an object file compiles with -fno-sycl leads to
73 # a failed link stage (when the same flag is not used). Since none of this is critical, we handle
74 # it by merely checking if it works to compile a source fils with this flag, and choking if SYCL
77 if(NOT CHECK_DISABLE_SYCL_CXX_FLAGS_QUIETLY)
78 message(STATUS "Checking for flags to disable SYCL")
81 gmx_check_source_compiles_with_flags(
82 "int main() { return 0; }"
85 DISABLE_SYCL_CXX_FLAGS_RESULT)
87 if(DISABLE_SYCL_CXX_FLAGS_RESULT)
88 set(DISABLE_SYCL_CXX_FLAGS "-fno-sycl")
90 if(NOT CHECK_DISABLE_SYCL_CXX_FLAGS_QUIETLY)
91 if(DISABLE_SYCL_CXX_FLAGS_RESULT)
92 message(STATUS "Checking for flags to disable SYCL - -fno-sycl")
94 message(WARNING "Cannot find flags to disable SYCL for non-SYCL hardware-specific C++ code. Expect many warnings, but they are likely benign.")
96 set(CHECK_DISABLE_SYCL_CXX_FLAGS_QUIETLY 1 CACHE INTERNAL "Keep quiet on future calls to detect no-SYCL flags" FORCE)
100 # Find the flags to enable (or re-enable) SYCL with Intel extensions. In case we turned it off above,
101 # it's important that we check the combination of both flags, to make sure the second one re-enables SYCL.
102 if(NOT CHECK_SYCL_CXX_FLAGS_QUIETLY)
103 message(STATUS "Checking for flags to enable SYCL")
105 gmx_find_flag_for_source(SYCL_CXX_FLAGS_RESULT
106 "#include <CL/sycl.hpp>
107 namespace sycl = cl::sycl;
109 sycl::queue q(sycl::default_selector{});
112 " "CXX" DISABLE_SYCL_CXX_FLAGS SYCL_CXX_FLAGS "-fsycl -fsycl-device-code-split=per_kernel")
114 if(NOT CHECK_SYCL_CXX_FLAGS_QUIETLY)
115 if(SYCL_CXX_FLAGS_RESULT)
116 message(STATUS "Checking for flags to enable SYCL - ${SYCL_CXX_FLAGS}")
118 set(CHECK_SYCL_CXX_FLAGS_QUIETLY 1 CACHE INTERNAL "Keep quiet on future calls to detect SYCL flags" FORCE)
121 if(NOT SYCL_CXX_FLAGS_RESULT)
122 message(FATAL_ERROR "Cannot compile with SYCL Intel compiler. Try a different compiler or disable SYCL.")
125 # Add function wrapper similar to the one used by ComputeCPP and hipSYCL
126 function(add_sycl_to_target)
127 cmake_parse_arguments(
128 PARSE_ARGV 0 # No positional arguments
129 ARGS # Prefix for the resulting variables
131 "TARGET" # One-value keyword
132 "SOURCES" # Multi-value keyword
134 set_source_files_properties(${ARGS_SOURCES} PROPERTIES COMPILE_FLAGS "${SYCL_CXX_FLAGS}")
135 target_link_libraries(${ARGS_TARGET} PRIVATE ${SYCL_CXX_FLAGS})
136 endfunction(add_sycl_to_target)