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				.\" Copyright (c) 2016 The FreeBSD Foundation. All rights reserved.
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				.\" This documentation was created by Ed Maste under sponsorship of
				.\" The FreeBSD Foundation.
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				.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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				.\" $FreeBSD$
				.\"
				.Dd July 19, 2016
				.Dt ARCH 7
				.Os
				.Sh NAME
				.Nm arch
				.Nd Architecture-specific details
				.Sh DESCRIPTION
				Differences between CPU architectures and platforms supported by
				.Fx .
				.Pp
				.Ss Type sizes
				On all supported architectures,
				.Bl -column -offset -indent "long long" "Size"
				.It Sy Type Ta Sy Size
				.It short Ta 2
				.It int Ta 4
				.It long Ta sizeof(void*)
				.It long long Ta 8
				.It float Ta 4
				.It double Ta 8
				.El
				.Bl -column -offset indent ".Sy Architecture" ".Sy sizeof(void *)" ".Sy "sizeof(long double)"
				.It Sy Architecture Ta Sy sizeof(void *) Ta Sy sizeof(long double)
				.It amd64 Ta 8 Ta 16
				.It arm Ta 4 Ta 8
				.It armeb Ta 4 Ta 8
				.It armv6 Ta 4 Ta 8
				.It arm64 Ta 8 Ta 16
				.It i386 Ta 4 Ta 12
				.It mips Ta 4 Ta 8
				.It mipsel Ta 4 Ta 8
				.It mipsn32 Ta 4 Ta 8
				.It mips64 Ta 8 Ta 8
				.It mips64el Ta 8 Ta 8
				.It powerpc Ta 4 Ta 8
				.It powerpc64 Ta 8 Ta 8
				.It riscv Ta 8 Ta
				.It sparc64 Ta 8 Ta 16
				.El
				.Ss Endianness and Char Signedness
				.Bl -column -offset indent ".Sy Architecture" ".Sy Endianness" ".Sy "char Signedness"
				.It Sy Architecture Ta Sy Endianness Ta Sy char Signedness
				.It amd64 Ta little Ta signed
				.It arm Ta little Ta unsigned
				.It armeb Ta big Ta unsigned
				.It armv6 Ta little Ta unsigned
				.It arm64 Ta little Ta unsigned
				.It i386 Ta little Ta signed
				.It mips Ta little Ta signed
				.It mipsel Ta big Ta signed
				.It mipsn32 Ta little Ta signed
				.It mips64 Ta little Ta signed
				.It mips64el Ta little Ta signed
				.It powerpc Ta big Ta unsigned
				.It powerpc64 Ta big Ta unsigned
				.It riscv Ta little Ta signed
				.It sparc64 Ta big Ta signed
				.El
				.Ss Page Size
				.Bl -column -offset indent ".Sy Architecture" ".Sy Page Sizes"
				.It Sy Architecture Ta Sy Page Sizes
				.It amd64 Ta 4K, 2M, 1G
				.It arm Ta 4K
				.It armeb Ta 4K
				.It armv6 Ta 4K
				.It arm64 Ta 4K, 2M, 1G
				.It i386 Ta 4K, 2M (PAE), 4M
				.It mips Ta 4K
				.It mipsel Ta 4K
				.It mipsn32 Ta 4K
				.It mips64 Ta 4K
				.It mips64el Ta 4K
				.It powerpc Ta 4K
				.It powerpc64 Ta 4K
				.It riscv Ta 4K
				.It sparc64 Ta 8K
				.El
				.Ss Floating Point
				.Bl -column -offset indent ".Sy Architecture" ".Sy float, double" ".Sy long double"
				.It Sy Architecture Ta Sy float, double Ta Sy long double
				.It amd64 Ta hard Ta hard, 80 bit
				.It arm Ta soft Ta soft, double precision
				.It armeb Ta soft Ta soft, double precision
				.It armv6 Ta hard Ta hard, double precision
				.It arm64 Ta hard Ta soft, quad precision
				.It i386 Ta hard Ta hard, 80 bit
				.It mips Ta soft Ta identical to double
				.It mipsel Ta soft Ta identical to double
				.It mipsn32 Ta soft Ta identical to double
				.It mips64 Ta soft Ta identical to double
				.It mips64el Ta soft Ta identical to double
				.It powerpc Ta hard Ta hard, double precision
				.It powerpc64 Ta hard Ta hard, double precision
				.It riscv Ta
				.It sparc64 Ta hard Ta hard, quad precision
				.El
				.Ss Predefined Macros
				The compiler provides a number of predefined macros.
				Some of these provide architecture-specific details and are explained below.
				Other macros, including those required by the language standard, are not
				included here.
				.Pp
				The full set of predefined macros can be obtained with this command:
				.Bd -literal -offset indent
				cc -x c -Dm -E /dev/null
				.Ed
				.Pp
				Common type size and endianness macros:
				.Bl -column -offset indent "BYTE_ORDER" ".Sy Meaning"
				.It Sy Macro Ta Sy Meaning
				.It Dv __LP64__ Ta 64-bit (8-byte) long and pointer, 32-bit (4-byte) int
				.It Dv __ILP32__ Ta 32-bit (4-byte) int, long and pointer
				.It Dv BYTE_ORDER Ta Either Dv BIG_ENDIAN or Dv LITTLE_ENDIAN .
				.Dv PDP11_ENDIAN is not used on FreeBSD.
				.El
				.Pp
				Architecture-specific macros:
				.Bl -column -offset indent ".Sy Architecture" ".Sy Predefined macros"
				.It Sy Architecture Ta Sy Predefined macros
				.It amd64 Ta Dv __amd64__, Dv __x86_64__
				.It arm Ta Dv __arm__
				.It armeb Ta Dv __arm__
				.It armv6 Ta Dv __arm__, Dv __ARM_ARCH >= 6
				.It arm64 Ta Dv __aarch64__
				.It i386 Ta Dv __i386__
				.It mips Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_o32
				.It mipsel Ta Dv __mips__, Dv __mips_o32
				.It mipsn32 Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_n32
				.It mips64 Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_n64
				.It mips64el Ta Dv __mips__, Dv __mips_n64
				.It powerpc Ta Dv __powerpc__
				.It powerpc64 Ta Dv __powerpc__, Dv __powerpc64__
				.It riscv Ta Dv __riscv__, Dv __riscv64
				.It sparc64 Ta Dv __sparc64__
				.El
				.Sh SEE ALSO
				.Xr src.conf 5 ,
				.Xr build 7
				.Sh HISTORY
				An
				.Nm
				manual page appeared in
				.Fx 12 .