# detect SIMD extensions
#
# HAVE_ARM
# HAVE_ARMV8_CRC
# HAVE_ARMV8_CRC_CRYPTO_INTRINSICS
# HAVE_ARMV8_CRYPTO
# HAVE_ARMV8_SIMD
# HAVE_ARM_NEON
#
# HAVE_INTEL
# HAVE_INTEL_SSE
# HAVE_INTEL_SSE2
# HAVE_INTEL_SSE3
# HAVE_INTEL_SSSE3
# HAVE_INTEL_PCLMUL
# HAVE_INTEL_SSE4_1
# HAVE_INTEL_SSE4_2
#
# HAVE_PPC64LE
# HAVE_PPC64
# HAVE_PPC
#
# HAVE_S390X
#
# SIMD_COMPILE_FLAGS
#

if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
  set(HAVE_ARM 1) 
  include(CheckCCompilerFlag)

  check_c_compiler_flag(-march=armv8-a+crc+crypto HAVE_ARMV8_CRC_CRYPTO_INTRINSICS)
  if(HAVE_ARMV8_CRC_CRYPTO_INTRINSICS)
    set(ARMV8_CRC_COMPILE_FLAGS "-march=armv8-a+crc+crypto")
    set(HAVE_ARMV8_CRC TRUE)
    set(HAVE_ARMV8_CRYPTO TRUE)
  else()
    check_c_compiler_flag(-march=armv8-a+crc HAVE_ARMV8_CRC)
    check_c_compiler_flag(-march=armv8-a+crypto HAVE_ARMV8_CRYPTO)
    if(HAVE_ARMV8_CRC)
      set(ARMV8_CRC_COMPILE_FLAGS "-march=armv8-a+crc")
    elseif(HAVE_ARMV8_CRYPTO)
      set(ARMV8_CRC_COMPILE_FLAGS "-march=armv8-a+crypto")
    endif()
  endif()

  CHECK_C_COMPILER_FLAG(-march=armv8-a+simd HAVE_ARMV8_SIMD)
  if(HAVE_ARMV8_SIMD)
    set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -march=armv8-a+simd")
  endif()

elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "arm|ARM")
  set(HAVE_ARM 1)
  CHECK_C_COMPILER_FLAG(-mfpu=neon HAVE_ARM_NEON)
  if(HAVE_ARM_NEON)
    set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -mfpu=neon")
  endif()

elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "i386|i686|amd64|x86_64|AMD64")
  set(HAVE_INTEL 1)
  if(CMAKE_SYSTEM_PROCESSOR MATCHES "i686|amd64|x86_64|AMD64")
    CHECK_C_COMPILER_FLAG(-msse HAVE_INTEL_SSE)
    if(HAVE_INTEL_SSE)
      set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse")
    endif()
    if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64|AMD64")
      CHECK_C_COMPILER_FLAG(-msse2 HAVE_INTEL_SSE2)
      if(HAVE_INTEL_SSE2)
        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse2")
      endif()
      CHECK_C_COMPILER_FLAG(-msse3 HAVE_INTEL_SSE3)
      if(HAVE_INTEL_SSE3)
        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse3")
      endif()
      CHECK_C_COMPILER_FLAG(-mssse3 HAVE_INTEL_SSSE3)
      if(HAVE_INTEL_SSSE3)
        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -mssse3")
      endif()
      CHECK_C_COMPILER_FLAG(-mpclmul HAVE_INTEL_PCLMUL)
      if(HAVE_INTEL_PCLMUL)
        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -mpclmul")
      endif()
      CHECK_C_COMPILER_FLAG(-msse4.1 HAVE_INTEL_SSE4_1)
      if(HAVE_INTEL_SSE4_1)
        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse4.1")
      endif()
      CHECK_C_COMPILER_FLAG(-msse4.2 HAVE_INTEL_SSE4_2)
      if(HAVE_INTEL_SSE4_2)
        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse4.2")
      endif()
    endif(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64|AMD64")
  endif(CMAKE_SYSTEM_PROCESSOR MATCHES "i686|amd64|x86_64|AMD64")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(powerpc|ppc)")
  if(CMAKE_SYSTEM_PROCESSOR MATCHES "(powerpc|ppc)64le")
    set(HAVE_PPC64LE 1)
    message(STATUS " we are ppc64le")
  elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(powerpc|ppc)64")
    set(HAVE_PPC64 1)
    message(STATUS " we are ppc64")
  else()
    set(HAVE_PPC 1)
  endif()
  CHECK_C_COMPILER_FLAG("-maltivec" HAS_ALTIVEC)
  if(HAS_ALTIVEC)
    message(STATUS " HAS_ALTIVEC yes")
    add_compile_options(-maltivec)
  endif()
  CHECK_C_COMPILER_FLAG("-mcpu=power8" HAVE_POWER8)
  if(HAVE_POWER8)
    message(STATUS " HAVE_POWER8 yes")
  endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(s390x|S390X|s390|S390)")
  set(HAVE_S390X 1)
  message(STATUS " we are s390x")
endif()