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35 # - Check the username performing the build, as well as date and time
37 # gmx_detect_simd(GMX_SUGGESTED_SIMD)
39 # Try to detect CPU information and suggest SIMD instruction set
40 # that fits the current CPU. This should work on all architectures
41 # where we are not cross-compiling; depending on the architecture the
42 # detection will either use special assembly instructions (like cpuid),
43 # preprocessor defines, or probing /proc/cpuinfo on Linux.
45 # This assumes gmx_detect_target_architecture() has already been run,
46 # so that things like GMX_TARGET_X86 are already available.
47 # (otherwise we cannot use inline ASM on x86).
49 # Sets ${GMX_SUGGESTED_SIMD} in the parent scope if
50 # GMX_SIMD is not set (e.g. by the user, or a previous run
54 # we rely on inline asm support for GNU!
55 include(gmxTestInlineASM)
57 function(gmx_suggest_simd _suggested_simd)
59 # for x86 we need inline asm to use cpuid
60 gmx_test_inline_asm_gcc_x86(GMX_X86_GCC_INLINE_ASM)
62 if(GMX_X86_GCC_INLINE_ASM)
63 set(GCC_INLINE_ASM_DEFINE "-DGMX_X86_GCC_INLINE_ASM=1")
65 set(GCC_INLINE_ASM_DEFINE "-DGMX_X86_GCC_INLINE_ASM=0")
68 message(STATUS "Detecting best SIMD instructions for this CPU")
70 # Get CPU SIMD properties information
71 set(_compile_definitions "${GCC_INLINE_ASM_DEFINE} -I${CMAKE_SOURCE_DIR}/src -DGMX_CPUINFO_STANDALONE")
73 # We need to execute the binary, so this only works if not cross-compiling.
74 # However, note that we are NOT limited to x86.
75 if(NOT CMAKE_CROSSCOMPILING)
76 try_run(GMX_CPUINFO_RUN_SIMD GMX_CPUINFO_COMPILED
78 ${CMAKE_SOURCE_DIR}/src/gromacs/hardware/cpuinfo.cpp
79 COMPILE_DEFINITIONS ${_compile_definitions}
80 RUN_OUTPUT_VARIABLE OUTPUT_TMP
81 COMPILE_OUTPUT_VARIABLE GMX_CPUINFO_COMPILE_OUTPUT
84 if(NOT GMX_CPUINFO_COMPILED)
85 message(WARNING "Cannot compile cpuinfo code, which means no SIMD instructions.")
86 message(STATUS "Compile output: ${GMX_CPUINFO_COMPILE_OUTPUT}")
87 set(OUTPUT_TMP "None")
88 elseif(NOT GMX_CPUINFO_RUN_SIMD EQUAL 0)
89 message(WARNING "Cannot run cpuinfo code, which means no SIMD instructions.")
90 message(STATUS "Run output: ${OUTPUT_TMP}")
91 set(OUTPUT_TMP "None")
92 endif(NOT GMX_CPUINFO_COMPILED)
95 if(OUTPUT_TMP MATCHES " avx512er ")
96 set(OUTPUT_SIMD "AVX_512_KNL")
97 elseif(OUTPUT_TMP MATCHES " avx512f ")
98 set(OUTPUT_SIMD "AVX_512")
99 elseif(OUTPUT_TMP MATCHES " avx2 ")
100 set(OUTPUT_SIMD "AVX2_256")
101 elseif(OUTPUT_TMP MATCHES " avx ")
102 if(OUTPUT_TMP MATCHES " fma4 ")
103 # AMD that works better with avx-128-fma
104 set(OUTPUT_SIMD "AVX_128_FMA")
107 set(OUTPUT_SIMD "AVX_256")
109 elseif(OUTPUT_TMP MATCHES " sse4.1 ")
110 set(OUTPUT_SIMD "SSE4.1")
111 elseif(OUTPUT_TMP MATCHES " sse2 ")
112 set(OUTPUT_SIMD "SSE2")
115 if(OUTPUT_TMP MATCHES " vsx ")
116 set(OUTPUT_SIMD "IBM_VSX")
117 elseif(OUTPUT_TMP MATCHES " vmx ")
118 set(OUTPUT_SIMD "IBM_VMX")
119 elseif(OUTPUT_TMP MATCHES " qpx ")
120 set(OUTPUT_SIMD "IBM_QPX")
121 elseif(OUTPUT_TMP MATCHES " neon_asimd ")
122 set(OUTPUT_SIMD "ARM_NEON_ASIMD")
123 elseif(OUTPUT_TMP MATCHES " neon ")
124 set(OUTPUT_SIMD "ARM_NEON")
128 set(${_suggested_simd} "${OUTPUT_SIMD}" PARENT_SCOPE)
129 message(STATUS "Detected best SIMD instructions for this CPU - ${OUTPUT_SIMD}")
131 set(${_suggested_simd} "None" PARENT_SCOPE)
132 message(WARNING "Cannot detect SIMD architecture for this cross-compile; you should check it manually.")
136 function(gmx_detect_simd _suggested_simd)
137 if(NOT DEFINED GMX_SIMD)
139 set(${_suggested_simd} "IBM_QPX")
140 elseif(GMX_TARGET_FUJITSU_SPARC64)
141 # HPC-ACE is always present. In the future we
142 # should add detection for HPC-ACE2 here.
143 set(${_suggested_simd} "Sparc64_HPC_ACE")
144 elseif(GMX_TARGET_MIC)
145 set(${_suggested_simd} "MIC")
147 gmx_suggest_simd(${_suggested_simd})
150 set(${_suggested_simd} ${${_suggested_simd}} PARENT_SCOPE)