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Architectures

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Alpha

Type Macro Description
Identification __alpha__ Defined by GNU C
Version __alpha_ev'V'__ V = Version
Identification __alpha Defined by DEC C
Identification _M_ALPHA Defined by Visual Studio
Example
CPU Macro
Alpha EV4 __alpha_ev4__
Alpha EV5 __alpha_ev5__
Alpha EV6 __alpha_ev6__

AMD64

Type Macro Description
Identification __amd64__
__amd64
__x86_64__
__x86_64
Defined by GNU C and Sun Studio
Identification _M_X64
_M_AMD64
Defined by Visual Studio

Notice that x32 can be detected by checking if the CPU uses the ILP32 data model.

ARM

Type Macro Description
Identification __arm__ Defined by GNU C and RealView
Identification __thumb__ Defined by GNU C and RealView in Thumb mode
Version __ARM_ARCH_'V'__ V = Version

Defined by GNU C 1
Identification __TARGET_ARCH_ARM
__TARGET_ARCH_THUMB
Defined by RealView
Version __TARGET_ARCH_ARM = V
__TARGET_ARCH_THUMB = V
V = Version
Version __TARGET_ARCH_'VR' VR = Version and Revision
Identification _ARM Defined by ImageCraft C
Identification _M_ARM Defined by Visual Studio
Identification _M_ARMT Defined by Visual Studio in Thumb mode
Version _M_ARM = V V = Version
Example
CPU Macro _M_ARM
ARM 2 __ARM_ARCH_2__
ARM 3 __ARM_ARCH_3__
__ARM_ARCH_3M__
ARM 4T __ARM_ARCH_4T__
__TARGET_ARM_4T
ARM 5 __ARM_ARCH_5__
__ARM_ARCH_5E__
5
ARM 5T __ARM_ARCH_5T__
__ARM_ARCH_5TE__
__ARM_ARCH_5TEJ__
ARM 6 __ARM_ARCH_6__
__ARM_ARCH_6J__
__ARM_ARCH_6K__
__ARM_ARCH_6Z__
__ARM_ARCH_6ZK__
6
ARM 6T2 __ARM_ARCH_6T2__
ARM 7 __ARM_ARCH_7__
__ARM_ARCH_7A__
__ARM_ARCH_7R__
__ARM_ARCH_7M__
__ARM_ARCH_7S__
7

ARM64

Type Macro Description
Identification __aarch64__ Defined by GNU C 1

Blackfin

Type Macro Description
Identification __bfin
__BFIN__
Defined by GNU C

Convex

Type Macro Description
Identification __convex__ Defined by GNU C
Version __convex_'V'__ V = Version
Example
CPU Macro
Convex C1 __convex_c1__
Convex C2 __convex_c2__
Convex C32xx series __convex_c32__
Convex C34xx series __convex_c34__
Convex C38xx series __convex_c38__

Epiphany

Type Macro
Identification __epiphany__

HP/PA RISC

Type Macro Description
Identification __hppa__ Defined by GNU C
Identification __HPPA__ Defined by Stratus VOS C
Identification __hppa
Version _PA_RISC'V'_'R' V = Version
R = Revision

See also OpenPA.net.

Example
CPU Macro
PA RISC 1.0 _PA_RISC1_0
PA RISC 1.1 _PA_RISC1_1
__HPPA11__
__PA7100__
PA RISC 2.0 _PA_RISC2_0
__RISC2_0__
__HPPA20__
__PA8000__

Intel x86

Type Macro Format Description
Identification i386
__i386
__i386__
Defined by GNU C
Version __i386__
__i486__
__i586__
__i686__
Defined by GNU C
Identification __i386 Defined by Sun Studio
Identification __i386
__IA32__
Defined by Stratus VOS C
Identification _M_I86 Only defined for 16-bits architectures

Defined by Visual Studio, Digital Mars, and Watcom C/C++ (see note below)
Identification _M_IX86 Only defined for 32-bits architectures

Defined by Visual Studio, Intel C/C++, Digital Mars, and Watcom C/C++
Version _M_IX86 V00 V = Version
Identification __X86__ Defined by Watcom C/C++
Identification _X86_ Defined by MinGW32
Identification __THW_INTEL__ Defined by XL C/C++
Identification __I86__ Defined by Digital Mars
Version __I86__ V V = Version
Identification __INTEL__ Defined by CodeWarrior

Notice that Watcom C/C++ defines _M_IX86 for both 16-bits and 32-bits architectures. Use __386__ or _M_I386 to detect 32-bits architectures in this case.

Notice that the Stratus VOS is big-endian on IA32, so these macros cannot be used to detect endianness if __VOS__ is set.

Example
CPU _M_IX86 __I86__
80386 300 3
80486 400 4
Pentium 500 5
Pentium Pro/II 600 6

Intel Itanium (IA-64)

Type Macro Format Description
Identification __ia64__
_IA64
__IA64__
Defined by GNU C
Identification __ia64 Defined by HP aCC
Identification _M_IA64 Defined by Visual Studio
Identification _M_IA64 Defined by Intel C/C++
Version _M_IA64 ?
Identification __itanium__ Defined by Intel C/C++
Example
CPU _M_IA64 (Intel C/C++)
64100

Motorola 68k

Type Macro Description
Identification __m68k__ Defined by GNU C
Version __mc'V'__
__mc'V'
mc'V'
V = Version
Identification M68000 Defined by SAS/C
Identification __MC68K__ Defined by Stratus VOS C
Version __MC'V'__ V = Version
Example
CPU Macro
68000 __mc68000__
__MC68000__
68010 __mc68010__
68020 __mc68020__
__MC68020__
68030 __mc68030__
__MC68030__
68040 __mc68040__
68060 __mc68060__

MIPS

Type Macro Description
Identification __mips__
mips
Defined by GNU C
Version _MIPS_ISA = _MIPS_ISA_MIPS'V' V = MIPS ISA level
Version _R3000
_R4000
_R5900
Identification __mips Defined by MIPSpro and GNU C
Version __mips The value indicates the MIPS ISA (Instruction Set Architecture) level
Version __MIPS_ISA'V'__ V = MIPS ISA level
Identification __MIPS__ Defined by Metrowerks
Example
CPU _MIPS_ISA GNU C Macro __mips MIPSpro Macro
R2000 _MIPS_ISA_MIPS1 1
R3000 _MIPS_ISA_MIPS1 _R3000 1
R6000 _MIPS_ISA_MIPS2 2 __MIPS_ISA2__
R4000 _R4000
R4400 _MIPS_ISA_MIPS3 3 __MIPS_ISA3__
R8000 _MIPS_ISA_MIPS4 4 __MIPS_ISA4__
R10000 _MIPS_ISA_MIPS4 4 __MIPS_ISA4__

PowerPC

Type Macro Description
Identification __powerpc
__powerpc__
__powerpc64__
__POWERPC__
__ppc__
__ppc64__
Defined by GNU C
Version __ppc'V'__ V = Version
Identification _M_PPC Defined by Visual Studio
Version _M_PPC ?
Identification _ARCH_PPC
_ARCH_PPC64
Defined by XL C/C++
Version _ARCH_'V' V = Version
Version __PPCGECKO__ Gekko

Defined by CodeWarrior
Version __PPCBROADWAY__ Broadway

Defined by CodeWarrior
Version _XENON Xenon
Example
CPU _M_PPC Macro XL Macro
PowerPC 440 _ARCH_440
PowerPC 450 _ARCH_450
PowerPC 601 601 __ppc601__ _ARCH_601
PowerPC 603 603 __ppc603__ _ARCH_603
PowerPC 604 604 __ppc604__ _ARCH_604
PowerPC 620 620

Pyramid 9810

Type Macro
Identification pyr

RS/6000

Type Macro Description
Identification __THW_RS6000 Defined by XL C/C++
Identification _IBMR2
Identification _POWER
Identification _ARCH_PWR
_ARCH_PWR2
_ARCH_PWR3
_ARCH_PWR4

SPARC

Type Macro Description
Identification __sparc__ Defined by GNU C
Identification __sparc Defined by Sun Studio
Version __sparcv8
__sparcv9
Defined by Sun Studio
Example
CPU Macro
SPARC v8 (SuperSPARC) __sparcv8
SPARC v9 (UltraSPARC) __sparcv9

SuperH

Type Macro Description
Identification __sh__ Defined by GNU C
Version __sh1__
__sh2__
__sh3__
__SH3__
__SH4__
__SH5__

SystemZ

Type Macro Description
Identification __370__
__THW_370__
Identifies System/370

Defined by XL C/C++
Identification __s390__ Identifies System/390

Defined by GNU C
Identification __s390x__ Identifies z/Architecture

Defined by GNU C
Identification __zarch__ Identifies z/Architecture

Defined by clang
Identification __SYSC_ZARCH__ Identifies z/Architecture

Defined by Systems/C

TMS320

Type Macro Description
Identification _TMS320C2XX
__TMS320C2000__
C2000 series
Identification _TMS320C5X
__TMS320C55X__
C5000 series
Identification _TMS320C6X
__TMS320C6X__
C6000 series
Example
DSP Macro
C28xx _TMS320C28X
C54x _TMS320C5XX
C55x __TMS320C55X__
C6200 _TMS320C6200
C6400 _TMS320C6400
C6400+ _TMS320C6400_PLUS
C6600 _TMS320C6600
C6700 _TMS320C6700
C6700+ _TMS320C6700_PLUS
C6740 _TMS320C6740

TMS470

Type Macro
Identification __TMS470__

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