# Copyright (c) 2012 Petroules Corporation. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     Redistributions of source code must retain the above copyright notice, this
#     list of conditions and the following disclaimer.  Redistributions in binary
#     form must reproduce the above copyright notice, this list of conditions and
#     the following disclaimer in the documentation and/or other materials
#     provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Modified for ignition libraries - 2017

# Based on the Qt 5 processor detection code, so should be very accurate
# https://qt.gitorious.org/qt/qtbase/blobs/master/src/corelib/global/qprocessordetection.h
# Currently handles arm (v5, v6, v7), x86 (32/64), ia64, and ppc (32/64)

# Regarding POWER/PowerPC, just as is noted in the Qt source,
# "There are many more known variants/revisions that we do not handle/detect."

set(archdetect_c_code "
#if defined(__arm__) || defined(__TARGET_ARCH_ARM)
    #if defined(__ARM_ARCH_7__) \\
        || defined(__ARM_ARCH_7A__) \\
        || defined(__ARM_ARCH_7R__) \\
        || defined(__ARM_ARCH_7M__) \\
        || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 7)
        #error cmake_ARCH armv7
    #elif defined(__ARM_ARCH_6__) \\
        || defined(__ARM_ARCH_6J__) \\
        || defined(__ARM_ARCH_6T2__) \\
        || defined(__ARM_ARCH_6Z__) \\
        || defined(__ARM_ARCH_6K__) \\
        || defined(__ARM_ARCH_6ZK__) \\
        || defined(__ARM_ARCH_6M__) \\
        || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 6)
        #error cmake_ARCH armv6
    #elif defined(__ARM_ARCH_5TEJ__) \\
        || (defined(__TARGET_ARCH_ARM) && __TARGET_ARCH_ARM-0 >= 5)
        #error cmake_ARCH armv5
    #else
        #error cmake_ARCH arm
    #endif
#elif defined(__i386) || defined(__i386__) || defined(_M_IX86)
    #error cmake_ARCH i386
#elif defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(_M_X64)
    #error cmake_ARCH x86_64
#elif defined(__ia64) || defined(__ia64__) || defined(_M_IA64)
    #error cmake_ARCH ia64
#elif defined(__ppc__) || defined(__ppc) || defined(__powerpc__) \\
      || defined(_ARCH_COM) || defined(_ARCH_PWR) || defined(_ARCH_PPC)  \\
      || defined(_M_MPPC) || defined(_M_PPC)
    #if defined(__ppc64__) || defined(__powerpc64__) || defined(__64BIT__)
        #error cmake_ARCH ppc64
    #else
        #error cmake_ARCH ppc
    #endif
#endif

#error cmake_ARCH unknown
")

# Set ppc_support to TRUE before including this file or ppc and ppc64
# will be treated as invalid architectures since they are no longer supported by Apple

if(APPLE AND CMAKE_OSX_ARCHITECTURES)
    # On OS X we use CMAKE_OSX_ARCHITECTURES *if* it was set
    # First let's normalize the order of the values

    # Note that it's not possible to compile PowerPC applications if you are using
    # the OS X SDK version 10.6 or later - you'll need 10.4/10.5 for that, so we
    # disable it by default
    # See this page for more information:
    # http://stackoverflow.com/questions/5333490/how-can-we-restore-ppc-ppc64-as-well-as-full-10-4-10-5-sdk-support-to-xcode-4

    # Architecture defaults to i386 or ppc on OS X 10.5 and earlier, depending on the CPU type detected at runtime.
    # On OS X 10.6+ the default is x86_64 if the CPU supports it, i386 otherwise.

    foreach(osx_arch ${CMAKE_OSX_ARCHITECTURES})
        if("${osx_arch}" STREQUAL "ppc" AND ppc_support)
            set(osx_arch_ppc TRUE)
        elseif("${osx_arch}" STREQUAL "i386")
            set(osx_arch_i386 TRUE)
        elseif("${osx_arch}" STREQUAL "x86_64")
            set(osx_arch_x86_64 TRUE)
        elseif("${osx_arch}" STREQUAL "ppc64" AND ppc_support)
            set(osx_arch_ppc64 TRUE)
        else()
            message(FATAL_ERROR "Invalid OS X arch name: ${osx_arch}")
        endif()
    endforeach()

    # Now add all the architectures in our normalized order
    if(osx_arch_ppc)
        list(APPEND ARCH ppc)
    endif()

    if(osx_arch_i386)
        list(APPEND ARCH i386)
    endif()

    if(osx_arch_x86_64)
        list(APPEND ARCH x86_64)
    endif()

    if(osx_arch_ppc64)
        list(APPEND ARCH ppc64)
    endif()
else()
    file(WRITE "${CMAKE_BINARY_DIR}/arch.c" "${archdetect_c_code}")

    enable_language(C)

    # Detect the architecture in a rather creative way...
    # This compiles a small C program which is a series of ifdefs that selects a
    # particular #error preprocessor directive whose message string contains the
    # target architecture. The program will always fail to compile (both because
    # file is not a valid C program, and obviously because of the presence of the
    # #error preprocessor directives... but by exploiting the preprocessor in this
    # way, we can detect the correct target architecture even when cross-compiling,
    # since the program itself never needs to be run (only the compiler/preprocessor)
    try_run(
        run_result_unused
        compile_result_unused
        "${CMAKE_BINARY_DIR}"
        "${CMAKE_BINARY_DIR}/arch.c"
        COMPILE_OUTPUT_VARIABLE ARCH
        CMAKE_FLAGS CMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}
    )

    # Parse the architecture name from the compiler output
    string(REGEX MATCH "cmake_ARCH ([a-zA-Z0-9_]+)" ARCH "${ARCH}")

    # Get rid of the value marker leaving just the architecture name
    string(REPLACE "cmake_ARCH " "" ARCH "${ARCH}")

    # If we are compiling with an unknown architecture this variable should
    # already be set to "unknown" but in the case that it's empty (i.e. due
    # to a typo in the code), then set it to unknown
    if (NOT ARCH)
        set(ARCH unknown)
    endif()
endif()


# Check if SSE instructions are available on the machine where
# the project is compiled.

IF (ARCH MATCHES "i386" OR ARCH MATCHES "x86_64")
  IF(CMAKE_SYSTEM_NAME MATCHES "Linux")
     EXEC_PROGRAM(cat ARGS "/proc/cpuinfo" OUTPUT_VARIABLE CPUINFO)

     STRING(REGEX REPLACE "^.*(sse2).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "sse2" "${SSE_THERE}" SSE2_TRUE)
     IF (SSE2_TRUE)
        set(SSE2_FOUND true CACHE BOOL "SSE2 available on host")
     ELSE (SSE2_TRUE)
        set(SSE2_FOUND false CACHE BOOL "SSE2 available on host")
     ENDIF (SSE2_TRUE)

     # /proc/cpuinfo apparently omits sse3 :(
     STRING(REGEX REPLACE "^.*[^s](sse3).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "sse3" "${SSE_THERE}" SSE3_TRUE)
     IF (NOT SSE3_TRUE)
        STRING(REGEX REPLACE "^.*(T2300).*$" "\\1" SSE_THERE ${CPUINFO})
        STRING(COMPARE EQUAL "T2300" "${SSE_THERE}" SSE3_TRUE)
     ENDIF (NOT SSE3_TRUE)

     STRING(REGEX REPLACE "^.*(ssse3).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "ssse3" "${SSE_THERE}" SSSE3_TRUE)
     IF (SSE3_TRUE OR SSSE3_TRUE)
        set(SSE3_FOUND true CACHE BOOL "SSE3 available on host")
     ELSE (SSE3_TRUE OR SSSE3_TRUE)
        set(SSE3_FOUND false CACHE BOOL "SSE3 available on host")
     ENDIF (SSE3_TRUE OR SSSE3_TRUE)
     IF (SSSE3_TRUE)
        set(SSSE3_FOUND true CACHE BOOL "SSSE3 available on host")
     ELSE (SSSE3_TRUE)
        set(SSSE3_FOUND false CACHE BOOL "SSSE3 available on host")
     ENDIF (SSSE3_TRUE)

     STRING(REGEX REPLACE "^.*(sse4_1).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "sse4_1" "${SSE_THERE}" SSE41_TRUE)
     IF (SSE41_TRUE)
        set(SSE4_1_FOUND true CACHE BOOL "SSE4.1 available on host")
     ELSE (SSE41_TRUE)
        set(SSE4_1_FOUND false CACHE BOOL "SSE4.1 available on host")
     ENDIF (SSE41_TRUE)

     STRING(REGEX REPLACE "^.*(sse4_2).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "sse4_2" "${SSE_THERE}" SSE42_TRUE)
     IF (SSE42_TRUE)
        set(SSE4_2_FOUND true CACHE BOOL "SSE4.2 available on host")
     ELSE (SSE42_TRUE)
        set(SSE4_2_FOUND false CACHE BOOL "SSE4.2 available on host")
     ENDIF (SSE42_TRUE)

  ELSEIF(CMAKE_SYSTEM_NAME MATCHES "Darwin")
     EXEC_PROGRAM("/usr/sbin/sysctl -n machdep.cpu.features" OUTPUT_VARIABLE
        CPUINFO)

     STRING(REGEX REPLACE "^.*[^S](SSE2).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "SSE2" "${SSE_THERE}" SSE2_TRUE)
     IF (SSE2_TRUE)
        set(SSE2_FOUND true CACHE BOOL "SSE2 available on host")
     ELSE (SSE2_TRUE)
        set(SSE2_FOUND false CACHE BOOL "SSE2 available on host")
     ENDIF (SSE2_TRUE)

     STRING(REGEX REPLACE "^.*[^S](SSE3).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "SSE3" "${SSE_THERE}" SSE3_TRUE)
     IF (SSE3_TRUE)
        set(SSE3_FOUND true CACHE BOOL "SSE3 available on host")
     ELSE (SSE3_TRUE)
        set(SSE3_FOUND false CACHE BOOL "SSE3 available on host")
     ENDIF (SSE3_TRUE)

     STRING(REGEX REPLACE "^.*(SSSE3).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "SSSE3" "${SSE_THERE}" SSSE3_TRUE)
     IF (SSSE3_TRUE)
        set(SSSE3_FOUND true CACHE BOOL "SSSE3 available on host")
     ELSE (SSSE3_TRUE)
        set(SSSE3_FOUND false CACHE BOOL "SSSE3 available on host")
     ENDIF (SSSE3_TRUE)

     STRING(REGEX REPLACE "^.*(SSE4.1).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "SSE4.1" "${SSE_THERE}" SSE41_TRUE)
     IF (SSE41_TRUE)
        set(SSE4_1_FOUND true CACHE BOOL "SSE4.1 available on host")
     ELSE (SSE41_TRUE)
        set(SSE4_1_FOUND false CACHE BOOL "SSE4.1 available on host")
     ENDIF (SSE41_TRUE)

     STRING(REGEX REPLACE "^.*(SSE4.2).*$" "\\1" SSE_THERE ${CPUINFO})
     STRING(COMPARE EQUAL "SSE4.2" "${SSE_THERE}" SSE42_TRUE)
     IF (SSE42_TRUE)
        set(SSE4_2_FOUND true CACHE BOOL "SSE4.2 available on host")
     ELSE (SSE42_TRUE)
        set(SSE4_2_FOUND false CACHE BOOL "SSE4.2 available on host")
     ENDIF (SSE42_TRUE)

  ELSEIF(CMAKE_SYSTEM_NAME MATCHES "Windows")
     # TODO
     set(SSE2_FOUND   true  CACHE BOOL "SSE2 available on host")
     set(SSE3_FOUND   false CACHE BOOL "SSE3 available on host")
     set(SSSE3_FOUND  false CACHE BOOL "SSSE3 available on host")
     set(SSE4_1_FOUND false CACHE BOOL "SSE4.1 available on host")
     set(SSE4_2_FOUND false CACHE BOOL "SSE4.2 available on host")
  ELSE(CMAKE_SYSTEM_NAME MATCHES "Linux")
     set(SSE2_FOUND   true  CACHE BOOL "SSE2 available on host")
     set(SSE3_FOUND   false CACHE BOOL "SSE3 available on host")
     set(SSSE3_FOUND  false CACHE BOOL "SSSE3 available on host")
     set(SSE4_1_FOUND false CACHE BOOL "SSE4.1 available on host")
     set(SSE4_2_FOUND false CACHE BOOL "SSE4.2 available on host")
  ENDIF(CMAKE_SYSTEM_NAME MATCHES "Linux")
ENDIF(ARCH MATCHES "i386" OR ARCH MATCHES "x86_64")

if(NOT SSE2_FOUND)
      MESSAGE(STATUS "Could not find hardware support for SSE2 on this machine.")
endif(NOT SSE2_FOUND)
if(NOT SSE3_FOUND)
      MESSAGE(STATUS "Could not find hardware support for SSE3 on this machine.")
endif(NOT SSE3_FOUND)
if(NOT SSSE3_FOUND)
      MESSAGE(STATUS "Could not find hardware support for SSSE3 on this machine.")
endif(NOT SSSE3_FOUND)
if(NOT SSE4_1_FOUND)
      MESSAGE(STATUS "Could not find hardware support for SSE4.1 on this machine.")
endif(NOT SSE4_1_FOUND)
if(NOT SSE4_2_FOUND)
      MESSAGE(STATUS "Could not find hardware support for SSE4.2 on this machine.")
endif(NOT SSE4_2_FOUND)
