mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-07-06 07:17:25 +00:00
211 lines
8.0 KiB
CMake
211 lines
8.0 KiB
CMake
##============================================================================
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## Copyright (c) Kitware, Inc.
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## All rights reserved.
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## See LICENSE.txt for details.
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##
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## This software is distributed WITHOUT ANY WARRANTY; without even
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## the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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## PURPOSE. See the above copyright notice for more information.
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##============================================================================
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#Currently all we are going to build is a set of options that are possible
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#based on the compiler. For now we are going on the presumption
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#that x86 architecture is the only target for vectorization and therefore
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#we don't need any system detect.
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#
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#Here is the breakdown of what each flag type means:
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#
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# 1. none:
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# Do not explicitly enable vectorization, but at the same don't explicitly disable
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# vectorization.
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#
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# 2. native:
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# Allow the compiler to use auto-detection based on the systems CPU to determine
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# the highest level of vectorization support that is allowed. This means that
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# libraries and executables built with this setting are non-portable.
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#
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# 3. avx
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# Compile with just AVX enabled, no AVX2 or AVX512 vectorization will be used.
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# This means that Sandy Bridge, Ivy Bridge, Haswell, and Skylake are supported,
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# but Haswell and newer will not use any AVX2 instructions
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#
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# 4. avx2
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# Compile with AVX2/AVX enabled, no AVX512 vectorization will be used.
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# This means that Sandy Bridge, and Ivy Bridge can not run the code.
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#
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# 5. avx512
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# Compile with AVX512/AVX2/AVX options enabled.
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# This means that Sandy Bridge, Ivy Bridge, Haswell and can not run the code.
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# Only XeonPhi Knights Landing and Skylake processors can run the code.
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#
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# AVX512 is designed to mix with avx/avx2 without any performance penalties,
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# so we enable AVX2 so that we get AVX2 support for < 32bit value types which
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# AVX512 has less support for
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#
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#
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# I wonder if we should go towards a per platform cmake include that stores
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# all this knowledge
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# include(gcc.cmake)
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# include(icc.cmake)
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# include(clang.cmake)
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#
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# This way we could also do compile warning flag detection at the same time
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#
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#
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# Note: By default we use 'native' as the default option
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#
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#
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# guard against building vectorization_flags more than once
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if(TARGET vtkm_vectorization_flags)
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return()
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endif()
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add_library(vtkm_vectorization_flags INTERFACE)
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set_target_properties(
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vtkm_vectorization_flags
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PROPERTIES
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EXPORT_NAME vectorization_flags
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)
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if(NOT VTKm_INSTALL_ONLY_LIBRARIES)
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install(TARGETS vtkm_vectorization_flags EXPORT ${VTKm_EXPORT_NAME})
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endif()
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# We currently don't know the vectorization flags for MSVC. But we want
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# the vtkm_vectorization_flags target to exist so we have a consistent
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# interface.
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if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" OR
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CMAKE_CXX_SIMULATE_ID STREQUAL "MSVC")
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return()
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endif()
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set(vec_levels none native)
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if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
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#for now we presume gcc >= 5.4
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list(APPEND vec_levels avx avx2)
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#common flags for the avx and avx2 instructions for the gcc compiler
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set(native_flags -march=native)
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if(CMAKE_SYSTEM_PROCESSOR STREQUAL "ppc64le")
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#GCC PowerPC font end doesn't support the march flag
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set(native_flags -mcpu=native -mtune=native)
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endif()
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set(avx_flags -mavx)
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set(avx2_flags ${avx_flags} -mf16c -mavx2 -mfma -mlzcnt -mbmi -mbmi2)
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1)
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#if GNU is less than 5.1 you get avx, avx2, and some avx512
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list(APPEND vec_levels avx512-knl)
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set(knl_flags ${avx2_flags} -mavx512f -mavx512pf -mavx512er -mavx512cd)
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elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
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#if GNU is 5.1+ to 8.0 we explicit set the flags as they
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#only have the concept of knl architecture and not skylake
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list(APPEND vec_levels avx512-skx avx512-knl)
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set(knl_flags ${avx2_flags} -mavx512f -mavx512pf -mavx512er -mavx512cd)
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set(skylake_flags ${avx2_flags} -mavx512f -mavx512dq -mavx512cd -mavx512bw -mavx512vl)
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else()
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#if GNU is 8+ has architecture names
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list(APPEND vec_levels avx512-skx avx512-knl)
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set(knl_flags -march=knl)
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set(skylake_flags -march=skylake-avx512)
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endif()
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elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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list(APPEND vec_levels avx avx2 avx512-skx avx512-knl)
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set(native_flags -march=native)
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set(avx_flags -mavx)
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set(avx2_flags ${avx_flags} -mf16c -mavx2 -mfma -mlzcnt -mbmi -mbmi2)
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.0)
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set(knl_flags ${avx2_flags} -avx512f -avx512cd -avx512dq -avx512bw -avx512vl)
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set(skylake_flags ${avx2_flags} -avx512f -avx512cd -avx512er -avx512pf)
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else()
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# Clang 4+ introduced skylake-avx512 and knl platforms
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set(knl_flags -march=knl)
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set(skylake_flags -march=skylake-avx512)
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endif()
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elseif(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
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list(APPEND vec_levels avx avx2)
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set(native_flags -march=native)
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set(avx_flags -mavx)
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set(avx2_flags ${avx_flags} -mf16c -mavx2 -mfma -mlzcnt -mbmi -mbmi2)
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if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 9.0)
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# Manually verified that skylake-avx512 exists in XCode 9.1. Could exist
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# in older versions that we dont have access to.
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list(APPEND vec_levels avx512-skx)
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set(skylake_flags -march=skylake-avx512)
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endif()
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elseif(CMAKE_CXX_COMPILER_ID STREQUAL "PGI")
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#I can't find documentation to explicitly state the level of vectorization
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#support I want from the PGI compiler
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#so for now we are going to do nothing
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elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
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#Intel 15.X is the first version with avx512
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#Intel 16.X has way better vector generation compared to 15.X though
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set(native_flags -xHost)
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set(avx_flags -xAVX)
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set(avx2_flags -xCORE-AVX2)
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if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 15.0)
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message(STATUS "While Intel ICC 14.0 and lower support #pragma simd")
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message(STATUS "The code that is generated in testing has caused SIGBUS")
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message(STATUS "runtime signals to be thrown. We recommend you upgrade")
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message(STATUS "or disable vectorization.")
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elseif (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 16.0)
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list(APPEND vec_levels avx avx2)
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else()
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list(APPEND vec_levels avx avx2 avx512-skx avx512-knl)
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set(knl_flags -xMIC-AVX512)
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set(skylake_flags -xCORE-AVX512)
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endif()
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endif()
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set_property(GLOBAL PROPERTY VTKm_NATIVE_FLAGS ${native_flags})
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set_property(GLOBAL PROPERTY VTKm_AVX_FLAGS ${avx_flags})
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set_property(GLOBAL PROPERTY VTKm_AVX2_FLAGS ${avx2_flags})
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set_property(GLOBAL PROPERTY VTKm_KNL_FLAGS ${knl_flags})
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set_property(GLOBAL PROPERTY VTKm_SKYLAKE_FLAGS ${skylake_flags})
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# Now that we have set up what levels the compiler lets setup the CMake option
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# We use a combo box style property, so that ccmake and cmake-gui have a
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# nice interface
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#
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set(VTKm_Vectorization "none" CACHE STRING "Level of compiler vectorization support")
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set_property(CACHE VTKm_Vectorization PROPERTY STRINGS ${vec_levels})
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if (NOT ${VTKm_Vectorization} STREQUAL "none")
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set(VTKM_VECTORIZATION_ENABLED "ON")
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endif()
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#
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# Now that we have set up the options, lets setup the compile flags that
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# we are going to require.
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#
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set(flags)
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if(VTKm_Vectorization STREQUAL "native")
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get_property(flags GLOBAL PROPERTY VTKm_NATIVE_FLAGS)
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elseif(VTKm_Vectorization STREQUAL "avx")
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get_property(flags GLOBAL PROPERTY VTKm_AVX_FLAGS)
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elseif(VTKm_Vectorization STREQUAL "avx2")
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get_property(flags GLOBAL PROPERTY VTKm_AVX2_FLAGS)
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elseif(VTKm_Vectorization STREQUAL "avx512-skx")
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get_property(flags GLOBAL PROPERTY VTKm_SKYLAKE_FLAGS)
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elseif(VTKm_Vectorization STREQUAL "avx512-knl")
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get_property(flags GLOBAL PROPERTY VTKm_KNL_FLAGS)
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endif()
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target_compile_options(vtkm_vectorization_flags
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INTERFACE $<$<COMPILE_LANGUAGE:CXX>:${flags}>
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)
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if(TARGET vtkm_cuda AND flags AND NOT CMAKE_CUDA_HOST_COMPILER)
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# Also propagate down these optimizations when building host side code
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# with cuda. To be safe we only do this when we know the C++ and CUDA
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# host compiler are from the same vendor
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string(REGEX REPLACE ";" "," cuda_flags "${flags}")
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target_compile_options(vtkm_vectorization_flags
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INTERFACE $<$<COMPILE_LANGUAGE:CUDA>:-Xcompiler=${cuda_flags}>
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)
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endif()
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