CMakeLists.txt

macro(simd_fail message)
    message(STATUS "libjpeg-turbo(SIMD): ${message}.  Performance will suffer.")
    set(WITH_SIMD 0 PARENT_SCOPE)
endmacro()

macro(boolean_number var)
  if(${var})
    set(${var} 1 ${ARGN})
  else()
    set(${var} 0 ${ARGN})
  endif()
endmacro()


###############################################################################
# x86[-64] (NASM)
###############################################################################

if(CPU_TYPE STREQUAL "x86_64" OR CPU_TYPE STREQUAL "i386")

set(CMAKE_ASM_NASM_FLAGS_DEBUG_INIT "-g")
set(CMAKE_ASM_NASM_FLAGS_RELWITHDEBINFO_INIT "-g")

# Allow the location of the NASM executable to be specified using the ASM_NASM
# environment variable.  This should happen automatically, but unfortunately
# enable_language(ASM_NASM) doesn't parse the ASM_NASM environment variable
# until after CMAKE_ASM_NASM_COMPILER has been populated with the results of
# searching for NASM or Yasm in the PATH.
if(NOT DEFINED CMAKE_ASM_NASM_COMPILER AND DEFINED ENV{ASM_NASM})
  set(CMAKE_ASM_NASM_COMPILER $ENV{ASM_NASM})
endif()

if(CPU_TYPE STREQUAL "x86_64")
  if(CYGWIN)
    set(CMAKE_ASM_NASM_OBJECT_FORMAT win64)
  endif()
  if(CMAKE_C_COMPILER_ABI MATCHES "ELF X32")
    set(CMAKE_ASM_NASM_OBJECT_FORMAT elfx32)
  endif()
elseif(CPU_TYPE STREQUAL "i386")
  if(BORLAND)
    set(CMAKE_ASM_NASM_OBJECT_FORMAT obj)
  elseif(CYGWIN)
    set(CMAKE_ASM_NASM_OBJECT_FORMAT win32)
  endif()
endif()


include(CheckLanguage)
check_language(ASM_NASM)
if(NOT CMAKE_ASM_NASM_COMPILER)
  simd_fail("SIMD extensions disabled: could not find NASM compiler")
  return()
endif()

enable_language(ASM_NASM)
message(STATUS "CMAKE_ASM_NASM_COMPILER = ${CMAKE_ASM_NASM_COMPILER}")

if(CMAKE_ASM_NASM_OBJECT_FORMAT MATCHES "^macho")
  set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -DMACHO")
elseif(CMAKE_ASM_NASM_OBJECT_FORMAT MATCHES "^elf")
  set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -DELF")
  set(CMAKE_ASM_NASM_DEBUG_FORMAT "dwarf2")
endif()
if(CPU_TYPE STREQUAL "x86_64")
  if(WIN32 OR CYGWIN)
    set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -DWIN64")
  endif()
  set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -D__x86_64__")
elseif(CPU_TYPE STREQUAL "i386")
  if(BORLAND)
    set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -DOBJ32")
  elseif(WIN32 OR CYGWIN)
    set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -DWIN32")
  endif()
endif()

if(NOT CMAKE_ASM_NASM_OBJECT_FORMAT)
  simd_fail("SIMD extensions disabled: could not determine NASM object format")
  return()
endif()

get_filename_component(CMAKE_ASM_NASM_COMPILER_TYPE
  "${CMAKE_ASM_NASM_COMPILER}" NAME_WE)
if(CMAKE_ASM_NASM_COMPILER_TYPE MATCHES "yasm")
  foreach(var CMAKE_ASM_NASM_FLAGS_DEBUG CMAKE_ASM_NASM_FLAGS_RELWITHDEBINFO)
    if(${var} STREQUAL "-g")
      if(CMAKE_ASM_NASM_DEBUG_FORMAT)
        set_property(CACHE ${var} PROPERTY VALUE "-g ${CMAKE_ASM_NASM_DEBUG_FORMAT}")
      else()
        set_property(CACHE ${var} PROPERTY VALUE "")
      endif()
    endif()
  endforeach()
endif()

if(NOT WIN32 AND (CMAKE_POSITION_INDEPENDENT_CODE OR ENABLE_SHARED))
  set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -DPIC")
endif()

string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UC)
set(EFFECTIVE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} ${CMAKE_ASM_NASM_FLAGS_${CMAKE_BUILD_TYPE_UC}}")

set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -I\"${CMAKE_CURRENT_SOURCE_DIR}/nasm/\" -I\"${CMAKE_CURRENT_SOURCE_DIR}/${CPU_TYPE}/\"")

set(GREP grep)
if(CMAKE_SYSTEM_NAME STREQUAL "SunOS")
  set(GREP ggrep)
endif()
add_custom_target(jsimdcfg COMMAND
  ${CMAKE_C_COMPILER} -E -I${CMAKE_BINARY_DIR} -I${CMAKE_CURRENT_BINARY_DIR}
    -I${CMAKE_CURRENT_SOURCE_DIR}
    ${CMAKE_CURRENT_SOURCE_DIR}/nasm/jsimdcfg.inc.h |
  ${GREP} -E '^[\;%]|^\ %' | sed 's%_cpp_protection_%%' |
  sed 's@% define@%define@g' >${CMAKE_CURRENT_SOURCE_DIR}/nasm/jsimdcfg.inc)
set_target_properties(jsimdcfg PROPERTIES FOLDER "3rdparty")

if(CPU_TYPE STREQUAL "x86_64")
  set(SIMD_SOURCES x86_64/jsimdcpu.asm x86_64/jfdctflt-sse.asm
    x86_64/jccolor-sse2.asm x86_64/jcgray-sse2.asm x86_64/jchuff-sse2.asm
    x86_64/jcphuff-sse2.asm x86_64/jcsample-sse2.asm x86_64/jdcolor-sse2.asm
    x86_64/jdmerge-sse2.asm x86_64/jdsample-sse2.asm x86_64/jfdctfst-sse2.asm
    x86_64/jfdctint-sse2.asm x86_64/jidctflt-sse2.asm x86_64/jidctfst-sse2.asm
    x86_64/jidctint-sse2.asm x86_64/jidctred-sse2.asm x86_64/jquantf-sse2.asm
    x86_64/jquanti-sse2.asm
    x86_64/jccolor-avx2.asm x86_64/jcgray-avx2.asm x86_64/jcsample-avx2.asm
    x86_64/jdcolor-avx2.asm x86_64/jdmerge-avx2.asm x86_64/jdsample-avx2.asm
    x86_64/jfdctint-avx2.asm x86_64/jidctint-avx2.asm x86_64/jquanti-avx2.asm)
else()
  set(SIMD_SOURCES i386/jsimdcpu.asm i386/jfdctflt-3dn.asm
    i386/jidctflt-3dn.asm i386/jquant-3dn.asm
    i386/jccolor-mmx.asm i386/jcgray-mmx.asm i386/jcsample-mmx.asm
    i386/jdcolor-mmx.asm i386/jdmerge-mmx.asm i386/jdsample-mmx.asm
    i386/jfdctfst-mmx.asm i386/jfdctint-mmx.asm i386/jidctfst-mmx.asm
    i386/jidctint-mmx.asm i386/jidctred-mmx.asm i386/jquant-mmx.asm
    i386/jfdctflt-sse.asm i386/jidctflt-sse.asm i386/jquant-sse.asm
    i386/jccolor-sse2.asm i386/jcgray-sse2.asm i386/jchuff-sse2.asm
    i386/jcphuff-sse2.asm i386/jcsample-sse2.asm i386/jdcolor-sse2.asm
    i386/jdmerge-sse2.asm i386/jdsample-sse2.asm i386/jfdctfst-sse2.asm
    i386/jfdctint-sse2.asm i386/jidctflt-sse2.asm i386/jidctfst-sse2.asm
    i386/jidctint-sse2.asm i386/jidctred-sse2.asm i386/jquantf-sse2.asm
    i386/jquanti-sse2.asm
    i386/jccolor-avx2.asm i386/jcgray-avx2.asm i386/jcsample-avx2.asm
    i386/jdcolor-avx2.asm i386/jdmerge-avx2.asm i386/jdsample-avx2.asm
    i386/jfdctint-avx2.asm i386/jidctint-avx2.asm i386/jquanti-avx2.asm)
endif()

if(MSVC_IDE)
  set(OBJDIR "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}")
  string(REGEX REPLACE " " ";" CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS}")
elseif(XCODE)
  set(OBJDIR "${CMAKE_CURRENT_BINARY_DIR}")
  string(REGEX REPLACE " " ";" CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS}")
endif()

file(GLOB INC_FILES nasm/*.inc)

foreach(file ${SIMD_SOURCES})
  set(OBJECT_DEPENDS "")
  if(${file} MATCHES jccolor)
    string(REGEX REPLACE "jccolor" "jccolext" DEPFILE ${file})
    set(OBJECT_DEPENDS ${OBJECT_DEPENDS}
      ${CMAKE_CURRENT_SOURCE_DIR}/${DEPFILE})
  endif()
  if(${file} MATCHES jcgray)
    string(REGEX REPLACE "jcgray" "jcgryext" DEPFILE ${file})
    set(OBJECT_DEPENDS ${OBJECT_DEPENDS}
      ${CMAKE_CURRENT_SOURCE_DIR}/${DEPFILE})
  endif()
  if(${file} MATCHES jdcolor)
    string(REGEX REPLACE "jdcolor" "jdcolext" DEPFILE ${file})
    set(OBJECT_DEPENDS ${OBJECT_DEPENDS}
      ${CMAKE_CURRENT_SOURCE_DIR}/${DEPFILE})
  endif()
  if(${file} MATCHES jdmerge)
    string(REGEX REPLACE "jdmerge" "jdmrgext" DEPFILE ${file})
    set(OBJECT_DEPENDS ${OBJECT_DEPENDS}
      ${CMAKE_CURRENT_SOURCE_DIR}/${DEPFILE})
  endif()
  set(OBJECT_DEPENDS ${OBJECT_DEPENDS} ${INC_FILES})
  if(MSVC_IDE OR XCODE)
    # The CMake Visual Studio generators do not work properly with the ASM_NASM
    # language, so we have to go rogue here and use a custom command like we
    # did in prior versions of libjpeg-turbo.  (This is why we can't have nice
    # things.)
    string(REGEX REPLACE "${CPU_TYPE}/" "" filename ${file})
    set(SIMD_OBJ ${OBJDIR}/${filename}${CMAKE_C_OUTPUT_EXTENSION})
    add_custom_command(OUTPUT ${SIMD_OBJ} DEPENDS ${file} ${OBJECT_DEPENDS}
      COMMAND ${CMAKE_ASM_NASM_COMPILER} -f${CMAKE_ASM_NASM_OBJECT_FORMAT}
        ${CMAKE_ASM_NASM_FLAGS} ${CMAKE_CURRENT_SOURCE_DIR}/${file}
        -o${SIMD_OBJ})
    set(SIMD_OBJS ${SIMD_OBJS} ${SIMD_OBJ})
  else()
    set_source_files_properties(${file} PROPERTIES OBJECT_DEPENDS
      "${OBJECT_DEPENDS}")
  endif()
endforeach()

if(MSVC_IDE OR XCODE)
  set(SIMD_OBJS ${SIMD_OBJS} PARENT_SCOPE)
  add_library(jsimd OBJECT ${CPU_TYPE}/jsimd.c)
  add_custom_target(jsimd-objs DEPENDS ${SIMD_OBJS})
  add_dependencies(jsimd jsimd-objs)
  set_target_properties(jsimd PROPERTIES FOLDER "3rdparty")
  set_target_properties(jsimd-objs PROPERTIES FOLDER "3rdparty")
else()
  add_library(jsimd OBJECT ${SIMD_SOURCES} ${CPU_TYPE}/jsimd.c)
endif()
if(NOT WIN32 AND (CMAKE_POSITION_INDEPENDENT_CODE OR ENABLE_SHARED))
  set_target_properties(jsimd PROPERTIES POSITION_INDEPENDENT_CODE 1)
endif()


###############################################################################
# Arm (Intrinsics or GAS)
###############################################################################

elseif(CPU_TYPE STREQUAL "arm64" OR CPU_TYPE STREQUAL "arm")

# If Neon instructions are not explicitly enabled at compile time (e.g. using
# -mfpu=neon) with an AArch32 Linux or Android build, then the AArch32 SIMD
# dispatcher will parse /proc/cpuinfo to determine whether the Neon SIMD
# extensions can be enabled at run time.  In order to support all AArch32 CPUs
# using the same code base, i.e. to support run-time FPU and Neon
# auto-detection, it is necessary to compile the scalar C source code using
# -mfloat-abi=soft (which is usually the default) but compile the intrinsics
# implementation of the Neon SIMD extensions using -mfloat-abi=softfp.  The
# following test determines whether -mfloat-abi=softfp should be explicitly
# added to the compile flags for the intrinsics implementation of the Neon SIMD
# extensions.

if(BITS EQUAL 32)
  check_c_source_compiles("
    #if defined(__ARM_NEON__) || (!defined(__linux__) && !defined(ANDROID) && !defined(__ANDROID__))
    #error \"Neon run-time auto-detection will not be used\"
    #endif
    #if __ARM_PCS_VFP == 1
    #error \"float ABI = hard\"
    #endif
    #if __SOFTFP__ != 1
    #error \"float ABI = softfp\"
    #endif
    int main(void) { return 0; }" NEED_SOFTFP_FOR_INTRINSICS)
  if(NEED_SOFTFP_FOR_INTRINSICS)
    set(SOFTFP_FLAG -mfloat-abi=softfp)
  endif()
endif()

if(BITS EQUAL 32)
  set(CMAKE_REQUIRED_FLAGS "-mfpu=neon ${SOFTFP_FLAG}")
  check_c_source_compiles("
    #include <arm_neon.h>
    int main(int argc, char **argv) {
      uint16x8_t input = vdupq_n_u16((uint16_t)argc);
      uint8x8_t output = vmovn_u16(input);
      return (int)output[0];
    }" HAVE_NEON)
  if(NOT HAVE_NEON)
    simd_fail("SIMD extensions not available for this architecture")
    return()
  endif()
endif()
check_c_source_compiles("
  #include <arm_neon.h>
  int main(int argc, char **argv) {
    int16_t input[] = {
      (int16_t)argc, (int16_t)argc, (int16_t)argc, (int16_t)argc,
      (int16_t)argc, (int16_t)argc, (int16_t)argc, (int16_t)argc,
      (int16_t)argc, (int16_t)argc, (int16_t)argc, (int16_t)argc
    };
    int16x4x3_t output = vld1_s16_x3(input);
    vst3_s16(input, output);
    return (int)input[0];
  }" HAVE_VLD1_S16_X3)
check_c_source_compiles("
  #include <arm_neon.h>
  int main(int argc, char **argv) {
    uint16_t input[] = {
      (uint16_t)argc, (uint16_t)argc, (uint16_t)argc, (uint16_t)argc,
      (uint16_t)argc, (uint16_t)argc, (uint16_t)argc, (uint16_t)argc
    };
    uint16x4x2_t output = vld1_u16_x2(input);
    vst2_u16(input, output);
    return (int)input[0];
  }" HAVE_VLD1_U16_X2)
check_c_source_compiles("
  #include <arm_neon.h>
  int main(int argc, char **argv) {
    uint8_t input[] = {
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc,
      (uint8_t)argc, (uint8_t)argc, (uint8_t)argc, (uint8_t)argc
    };
    uint8x16x4_t output = vld1q_u8_x4(input);
    vst4q_u8(input, output);
    return (int)input[0];
  }" HAVE_VLD1Q_U8_X4)
if(BITS EQUAL 32)
  unset(CMAKE_REQUIRED_FLAGS)
endif()
configure_file(arm/neon-compat.h.in arm/neon-compat.h @ONLY)
include_directories(${CMAKE_CURRENT_BINARY_DIR}/arm)

# GCC 11 and earlier and some older versions of Clang do not have a full or
# optimal set of Neon intrinsics, so for performance reasons, when using those
# compilers, we default to using the older GAS implementation of the Neon SIMD
# extensions for certain algorithms.  The presence or absence of the three
# intrinsics we tested above is a reasonable proxy for this, except with GCC 10
# and 11.
if((HAVE_VLD1_S16_X3 AND HAVE_VLD1_U16_X2 AND HAVE_VLD1Q_U8_X4 AND
  (NOT CMAKE_COMPILER_IS_GNUCC OR
  CMAKE_C_COMPILER_VERSION VERSION_EQUAL 12.0.0 OR
  CMAKE_C_COMPILER_VERSION VERSION_GREATER 12.0.0)))
  set(DEFAULT_NEON_INTRINSICS 1)
else()
  set(DEFAULT_NEON_INTRINSICS 0)
endif()
option(NEON_INTRINSICS
  "Because GCC (as of this writing) and some older versions of Clang do not have a full or optimal set of Neon intrinsics, for performance reasons, the default when building libjpeg-turbo with those compilers is to continue using the older GAS implementation of the Neon SIMD extensions for certain algorithms.  Setting this option forces the full Neon intrinsics implementation to be used with all compilers.  Unsetting this option forces the hybrid GAS/intrinsics implementation to be used with all compilers."
  ${DEFAULT_NEON_INTRINSICS})
if(NOT NEON_INTRINSICS)
  enable_language(ASM)

  set(CMAKE_ASM_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ASM_FLAGS}")

  # Test whether gas-preprocessor.pl would be needed to build the GAS
  # implementation of the Neon SIMD extensions.  If so, then automatically
  # enable the full Neon intrinsics implementation.
  if(CPU_TYPE STREQUAL "arm")
    file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/gastest.S "
      .text
      .fpu neon
      .arch armv7a
      .object_arch armv4
      .arm
      pld [r0]
      vmovn.u16 d0, q0")
  else()
    file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/gastest.S "
      .text
      MYVAR .req x0
      movi v0.16b, #100
      mov MYVAR, #100
      .unreq MYVAR")
  endif()
  separate_arguments(CMAKE_ASM_FLAGS_SEP UNIX_COMMAND "${CMAKE_ASM_FLAGS}")
  execute_process(COMMAND ${CMAKE_ASM_COMPILER} ${CMAKE_ASM_FLAGS_SEP}
      -x assembler-with-cpp -c ${CMAKE_CURRENT_BINARY_DIR}/gastest.S
    RESULT_VARIABLE RESULT OUTPUT_VARIABLE OUTPUT ERROR_VARIABLE ERROR)
  if(NOT RESULT EQUAL 0)
    message(STATUS "libjpeg-turbo(SIMD): GAS appears to be broken.  Using the full Neon SIMD intrinsics implementation.")
    set(NEON_INTRINSICS 1 CACHE INTERNAL "" FORCE)
  endif()
endif()
boolean_number(NEON_INTRINSICS PARENT_SCOPE)
if(NEON_INTRINSICS)
  add_definitions(-DNEON_INTRINSICS)
  message(STATUS "Use full Neon SIMD intrinsics implementation (NEON_INTRINSICS = ${NEON_INTRINSICS})")
else()
  message(STATUS "Use partial Neon SIMD intrinsics implementation (NEON_INTRINSICS = ${NEON_INTRINSICS})")
endif()

set(SIMD_SOURCES arm/jcgray-neon.c arm/jcphuff-neon.c arm/jcsample-neon.c
  arm/jdmerge-neon.c arm/jdsample-neon.c arm/jfdctfst-neon.c
  arm/jidctred-neon.c arm/jquanti-neon.c)
if(NEON_INTRINSICS)
  set(SIMD_SOURCES ${SIMD_SOURCES} arm/jccolor-neon.c arm/jidctint-neon.c)
endif()
if(NEON_INTRINSICS OR BITS EQUAL 64)
  set(SIMD_SOURCES ${SIMD_SOURCES} arm/jidctfst-neon.c)
endif()
if(NEON_INTRINSICS OR BITS EQUAL 32)
  set(SIMD_SOURCES ${SIMD_SOURCES} arm/aarch${BITS}/jchuff-neon.c
    arm/jdcolor-neon.c arm/jfdctint-neon.c)
endif()
if(BITS EQUAL 32)
  set_source_files_properties(${SIMD_SOURCES} COMPILE_FLAGS "-mfpu=neon ${SOFTFP_FLAG}")
endif()
if(NOT NEON_INTRINSICS)
  string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UC)
  set(EFFECTIVE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${CMAKE_ASM_FLAGS_${CMAKE_BUILD_TYPE_UC}}")
  message(STATUS "CMAKE_ASM_FLAGS = ${EFFECTIVE_ASM_FLAGS}")

  set(SIMD_SOURCES ${SIMD_SOURCES} arm/aarch${BITS}/jsimd_neon.S)
endif()

add_library(jsimd OBJECT ${SIMD_SOURCES} arm/aarch${BITS}/jsimd.c)

if(CMAKE_POSITION_INDEPENDENT_CODE OR ENABLE_SHARED)
  set_target_properties(jsimd PROPERTIES POSITION_INDEPENDENT_CODE 1)
endif()


###############################################################################
# MIPS (GAS)
###############################################################################

elseif(CPU_TYPE STREQUAL "mips" OR CPU_TYPE STREQUAL "mipsel")

enable_language(ASM)

string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UC)
set(EFFECTIVE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${CMAKE_ASM_FLAGS_${CMAKE_BUILD_TYPE_UC}}")
message(STATUS "CMAKE_ASM_FLAGS = ${EFFECTIVE_ASM_FLAGS}")

set(CMAKE_REQUIRED_FLAGS -mdspr2)

check_c_source_compiles("
  #if !(defined(__mips__) && __mips_isa_rev >= 2)
  #error MIPS DSPr2 is currently only available on MIPS32r2 platforms.
  #endif
  int main(void) {
    int c = 0, a = 0, b = 0;
    __asm__ __volatile__ (
      \"precr.qb.ph %[c], %[a], %[b]\"
      : [c] \"=r\" (c)
      : [a] \"r\" (a), [b] \"r\" (b)
    );
    return c;
  }" HAVE_DSPR2)

unset(CMAKE_REQUIRED_FLAGS)

if(NOT HAVE_DSPR2)
  simd_fail("SIMD extensions not available for this CPU")
  return()
endif()

add_library(jsimd OBJECT mips/jsimd_dspr2.S mips/jsimd.c)

if(CMAKE_POSITION_INDEPENDENT_CODE OR ENABLE_SHARED)
  set_target_properties(jsimd PROPERTIES POSITION_INDEPENDENT_CODE 1)
endif()

###############################################################################
# MIPS64 (Intrinsics)
###############################################################################

elseif(CPU_TYPE STREQUAL "loongson" OR CPU_TYPE MATCHES "^mips64")

set(CMAKE_REQUIRED_FLAGS -Wa,-mloongson-mmi,-mloongson-ext)

check_c_source_compiles("
  int main(void) {
    int c = 0, a = 0, b = 0;
    asm (
      \"paddb %0, %1, %2\"
      : \"=f\" (c)
      : \"f\" (a), \"f\" (b)
    );
    return c;
  }" HAVE_MMI)

unset(CMAKE_REQUIRED_FLAGS)

if(NOT HAVE_MMI)
  simd_fail("SIMD extensions not available for this CPU")
  return()
endif()

set(SIMD_SOURCES mips64/jccolor-mmi.c mips64/jcgray-mmi.c mips64/jcsample-mmi.c
  mips64/jdcolor-mmi.c mips64/jdmerge-mmi.c mips64/jdsample-mmi.c
  mips64/jfdctfst-mmi.c mips64/jfdctint-mmi.c mips64/jidctfst-mmi.c
  mips64/jidctint-mmi.c mips64/jquanti-mmi.c)

if(CMAKE_COMPILER_IS_GNUCC)
  foreach(file ${SIMD_SOURCES})
    set_property(SOURCE ${file} APPEND_STRING PROPERTY COMPILE_FLAGS
      " -fno-strict-aliasing")
  endforeach()
endif()
foreach(file ${SIMD_SOURCES})
  set_property(SOURCE ${file} APPEND_STRING PROPERTY COMPILE_FLAGS
    " -Wa,-mloongson-mmi,-mloongson-ext")
endforeach()

add_library(jsimd OBJECT ${SIMD_SOURCES} mips64/jsimd.c)

if(CMAKE_POSITION_INDEPENDENT_CODE OR ENABLE_SHARED)
  set_target_properties(jsimd PROPERTIES POSITION_INDEPENDENT_CODE 1)
endif()

###############################################################################
# PowerPC (Intrinsics)
###############################################################################

elseif(CPU_TYPE STREQUAL "powerpc")

set(CMAKE_REQUIRED_FLAGS -maltivec)

check_c_source_compiles("
  #include <altivec.h>
  int main(void) {
    __vector int vi = { 0, 0, 0, 0 };
    int i[4];
    vec_st(vi, 0, i);
    return i[0];
  }" HAVE_ALTIVEC)

unset(CMAKE_REQUIRED_FLAGS)

if(NOT HAVE_ALTIVEC)
  simd_fail("SIMD extensions not available for this CPU (PowerPC SPE)")
  return()
endif()

set(SIMD_SOURCES powerpc/jccolor-altivec.c powerpc/jcgray-altivec.c
  powerpc/jcsample-altivec.c powerpc/jdcolor-altivec.c
  powerpc/jdmerge-altivec.c powerpc/jdsample-altivec.c
  powerpc/jfdctfst-altivec.c powerpc/jfdctint-altivec.c
  powerpc/jidctfst-altivec.c powerpc/jidctint-altivec.c
  powerpc/jquanti-altivec.c)

set_source_files_properties(${SIMD_SOURCES} PROPERTIES
  COMPILE_FLAGS -maltivec)

add_library(jsimd OBJECT ${SIMD_SOURCES} powerpc/jsimd.c)

if(CMAKE_POSITION_INDEPENDENT_CODE OR ENABLE_SHARED)
  set_target_properties(jsimd PROPERTIES POSITION_INDEPENDENT_CODE 1)
endif()


###############################################################################
# None
###############################################################################

else()

simd_fail("SIMD extensions not available for this CPU (${CMAKE_SYSTEM_PROCESSOR})")

endif() # CPU_TYPE