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35 # Manage setup of the different FFT libraries we can use in Gromacs.
38 # Intel 11 and up makes life somewhat easy if you just want to use
39 # all their stuff. It's not easy if you only want some of their
41 set(MKL_MANUALLY FALSE)
42 if (GMX_FFT_LIBRARY STREQUAL "MKL" AND
43 NOT (CMAKE_C_COMPILER_ID MATCHES "Intel" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER "11"))
44 # The user will have to provide the set of magic libraries in
45 # MKL_LIBRARIES (see below), which we cache (non-advanced), so that they
46 # don't have to keep specifying it, and can easily see that
47 # CMake is still using that information.
48 set(MKL_MANUALLY TRUE)
50 set(MKL_LIBRARIES_FORMAT_DESCRIPTION "Use full paths to library files, in the right order, and separated by semicolons.")
51 gmx_dependent_cache_variable(
53 "List of libraries for linking to MKL. ${MKL_LIBRARIES_FORMAT_DESCRIPTION}"
56 gmx_dependent_cache_variable(
58 "Path to mkl.h (non-inclusive)."
61 if(${GMX_FFT_LIBRARY} STREQUAL "FFTW3")
62 # ${FFTW} must be in upper case
69 if(GMX_BUILD_OWN_FFTW)
70 add_subdirectory(src/contrib/fftw)
71 include_directories(BEFORE ${${FFTW}_INCLUDE_DIRS})
72 # libgmxfftw is always built static, so libgromacs does not
73 # have a dependency on anything, so PKG_FFT should be empty
75 set(FFT_STATUS_MESSAGE "Using external FFT library - FFTW3 build managed by GROMACS")
77 string(TOLOWER "${FFTW}" LOWERFFTW)
78 find_package(FFTW COMPONENTS ${LOWERFFTW})
81 MESSAGE(FATAL_ERROR "Cannot find FFTW 3 (with correct precision - libfftw3f for mixed-precision GROMACS or libfftw3 for double-precision GROMACS). Either choose the right precision, choose another FFT(W) library (-DGMX_FFT_LIBRARY), enable the advanced option to let GROMACS build FFTW 3 for you (-DGMX_BUILD_OWN_FFTW=ON), or use the really slow GROMACS built-in fftpack library (-DGMX_FFT_LIBRARY=fftpack).")
84 set(PKG_FFT "${${FFTW}_PKG}")
85 include_directories(SYSTEM ${${FFTW}_INCLUDE_DIRS})
87 if ((${GMX_SIMD} MATCHES "SSE" OR ${GMX_SIMD} MATCHES "AVX") AND NOT ${FFTW}_HAVE_SIMD)
88 message(WARNING "The fftw library found is compiled without SIMD support, which makes it slow. Consider recompiling it or contact your admin")
90 if(${GMX_SIMD} MATCHES "AVX" AND NOT (${FFTW}_HAVE_SSE OR ${FFTW}_HAVE_SSE2))
91 # If we end up here we have an AVX Gromacs build, and FFTW
92 # with SIMD. FFTW 3.3.5 will have the behaviour that
93 # configuring with AVX support also adds SSE support, which is
94 # what we want. There is no good way to detect the FFTW
96 message(WARNING "The FFTW library was compiled with neither --enable-sse nor --enable-sse2; those would have enabled SSE(2) SIMD instructions. This will give suboptimal performance. You should (re)compile the FFTW library with both SSE2 and AVX instruction support (use both --enable-sse2 and --enable-avx). More recent versions of FFTW compile support for such narrower SIMD by default.")
99 set(FFT_STATUS_MESSAGE "Using external FFT library - FFTW3")
102 set(FFT_LIBRARIES ${${FFTW}_LIBRARIES})
104 elseif(${GMX_FFT_LIBRARY} STREQUAL "MKL")
105 # Intel 11 and up makes life somewhat easy if you just want to use
106 # all their stuff. It's not easy if you only want some of their
108 if (NOT MKL_MANUALLY)
109 # The next line takes care of everything for MKL
111 # This works according to the Intel MKL 10.3 for Windows
112 # docs, but on Jenkins Win2k8, icl tries to interpret it
114 set(FFT_LINKER_FLAGS "/Qmkl:sequential")
116 set(FFT_LINKER_FLAGS "-mkl=sequential")
118 # Some versions of icc require this in order that mkl.h can be
119 # found at compile time.
120 set(EXTRA_C_FLAGS "${EXTRA_C_FLAGS} ${FFT_LINKER_FLAGS}")
122 set(MKL_ERROR_MESSAGE "Make sure you have configured your compiler so that ${FFT_LINKER_FLAGS} will work.")
124 include_directories(SYSTEM ${MKL_INCLUDE_DIR})
125 set(FFT_LIBRARIES "${MKL_LIBRARIES}")
126 set(MKL_ERROR_MESSAGE "The include path to mkl.h in MKL_INCLUDE_DIR, and the link libraries in MKL_LIBRARIES=${MKL_LIBRARIES} need to match what the MKL documentation says you need for your system: ${MKL_LIBRARIES_FORMAT_DESCRIPTION}")
127 # Convert the semi-colon separated list to a list of
128 # command-line linker arguments so that code using our
129 # pkgconfig setup can use it.
130 string(REGEX REPLACE ";" " " PKG_FFT_LIBS "${MKL_LIBRARIES}")
133 # Check MKL works. If we were in a non-global scope, we wouldn't
134 # have to play nicely.
135 set(old_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
136 set(CMAKE_REQUIRED_FLAGS "${FFT_LINKER_FLAGS}")
137 set(old_CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}")
138 set(CMAKE_REQUIRED_LIBRARIES "${FFT_LIBRARIES}")
140 check_function_exists(DftiCreateDescriptor TEST_MKL)
142 set(CMAKE_REQUIRED_FLAGS "${old_CMAKE_REQUIRED_FLAGS}")
143 set(CMAKE_REQUIRED_LIBRARIES "${old_CMAKE_REQUIRED_LIBRARIES}")
146 # Hack to help the user vary MKL settings until they work.
147 # TODO Make this logic more useful.
148 unset(TEST_MKL CACHE)
149 message(FATAL_ERROR "Linking with MKL was requested, but was not successful: ${MKL_ERROR_MESSAGE}")
152 # Set variables to signal that we have MKL available and should use it for FFTs.
156 set(FFT_STATUS_MESSAGE "Using external FFT library - Intel MKL")
157 elseif(${GMX_FFT_LIBRARY} STREQUAL "FFTPACK")
158 set(GMX_FFT_FFTPACK 1)
159 set(FFT_STATUS_MESSAGE "Using internal FFT library - fftpack")
161 gmx_invalid_option_value(GMX_FFT_LIBRARY)
163 gmx_check_if_changed(FFT_CHANGED GMX_FFT_LIBRARY)
165 message(STATUS "${FFT_STATUS_MESSAGE}")
168 # enable threaded fftw3 if we've found it
169 if(FFTW3_THREADS OR FFTW3F_THREADS)
170 add_definitions(-DFFT5D_FFTW_THREADS)