Description

The x86 architecture from Intel.

Macros

Type	Macro	Format	Description
Identification	`i386__i386__i386__`		Defined by GNU
Version	`__i386____i486____i586____i686__`		Defined by GNU
Identification	`__i386`		Defined by Sun Studio
Identification	`_M_I86`		Only for 16-bit architectures. Defined by Visual Studio, Digital Mars, and Watcom
Identification	`_M_IX86`		Only for 32-bit architectures. Defined by Visual Studio, Intel, Digital Mars, and Watcom
Version	`_M_IX86`	`V00`	V = Version
Identification	`__X86__`		Defined by Watcom
Identification	`__THW_INTEL__`		Defined by IBM XL
Identification	`__I86__`		Defined by Digital Mars
Version	`__I86__`	`V`	V = Version
Identification	`__INTEL__`		Defined by CodeWarrior

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