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

ARM

Type	Macro	Description
Identification	`__arm__`	Defined by GNU C and RealView
Identification	`__thumb__`	Defined by GNU C and RealView in Thumb mode
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

Example

CPU	Macro
ARM 4T	`__TARGET_ARM_4T`

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__`

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 [http://www.openpa.net/ 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__`		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_IX86`		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
Identification	`__x86_64` `__x86_64__`		Defined by Intel C/C++

Please 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
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__` `__POWERPC__` `__ppc__`	Defined by GNU C
Version	`__ppc'V'__`	V = Version
Identification	`_M_PPC`	Defined by Visual Studio
Version	`_M_PPC`	?
Identification	`_ARCH_PPC`	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 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`

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__`