This suggestion addresses the potential that the TARGET environment might be
able to utilize the feature.
Just because I can compile code for a hypothetical target machine, there is no
guarantee that the actual target machine will have the necessary features.
I recognize that most compilations have been done in a configuration where the
HOST and TARGET machines are the same machine. However, that is, in reality, a
special case.
Richard
On Mar 26, 2010, at 8:12 PM, Mike Jackson wrote:
> You can use the "Try_Compile()" function with a source file that has
> specific SSE and MMX code. If the file compiles correctly then you
> have SSE/MMX.
>
> This is what I used:
>
> # --------------- Begin
> set (SSE_COMPILE_FLAGS "")
> option(AIM_USE_SSE "Use SSE2/3 Instructions where possible." OFF)
> if (AIM_USE_SSE)
> if (NOT MSVC)
> set(CMAKE_REQUIRED_C_FLAGS_SAVE ${CMAKE_REQUIRED_C_FLAGS})
> set(CMAKE_REQUIRED_C_FLAGS ${CMAKE_REQUIRED_C_FLAGS} "-msse3")
> CHECK_INCLUDE_FILE("pmmintrin.h" HAVE_SSE3_H)
> set(CMAKE_REQUIRED_C_FLAGS ${CMAKE_REQUIRED_C_FLAGS_SAVE})
> if (HAVE_SSE3_H)
> set(HAVE_SSE2_H 1)
> if (CMAKE_COMPILER_IS_GNUCC)
> # set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse3")
> # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse3")
> set (SSE_COMPILE_FLAGS "-msse3")
> endif()
> else()
> set (HAVE_SSE3_H 0)
> endif()
>
> if (NOT HAVE_SSE3_H)
> set(CMAKE_REQUIRED_C_FLAGS_SAVE ${CMAKE_REQUIRED_C_FLAGS})
> set(CMAKE_REQUIRED_C_FLAGS ${CMAKE_REQUIRED_C_FLAGS} "-msse2")
> CHECK_INCLUDE_FILE("emmintrin.h" HAVE_SSE2_H)
> set(CMAKE_REQUIRED_C_FLAGS ${CMAKE_REQUIRED_C_FLAGS_SAVE})
> if(HAVE_SSE2_H)
> if (CMAKE_COMPILER_IS_GNUCC)
> # set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse2")
> # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse2")
> set (SSE_COMPILE_FLAGS "-msse2")
> endif()
> else()
> set (HAVE_SSE2_H 0)
> endif()
> endif()
> else()
> set(CMAKE_REQUIRED_C_FLAGS_SAVE ${CMAKE_REQUIRED_C_FLAGS})
> set(CMAKE_REQUIRED_C_FLAGS ${CMAKE_REQUIRED_C_FLAGS} "/arch:SSE2")
> CHECK_INCLUDE_FILE("intrin.h" HAVE_INTRIN_H)
> set(CMAKE_REQUIRED_C_FLAGS ${CMAKE_REQUIRED_C_FLAGS_SAVE})
> if (HAVE_INTRIN_H)
> #set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /arch:SSE2")
> #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:SSE2")
> set (SSE_COMPILE_FLAGS " /arch:SSE2 ")
> else()
> set (HAVE_INTRIN_H 0)
> endif()
> endif()
> endif()
> #---------------- End
> _________________________________________________________
> Mike Jackson mike.jack...@bluequartz.net
> BlueQuartz Software www.bluequartz.net
> Principal Software Engineer Dayton, Ohio
>
>
>
> On Fri, Mar 26, 2010 at 7:23 PM, Alexander Tarasov <al...@gmx.com> wrote:
>> Hi All,
>>
>> Is there a clean way to find out if host CPU supports MMX & SSE2 extensions?
>>
>> As far as I know this stuff is analyzed by cmake (am I wrong?). However I've
>> did not find any way this info can be used in CMakeLists.txt.
>>
>> Best regards,
>> Alexander.
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