1.\" Copyright (c) 2016 The FreeBSD Foundation. All rights reserved. 2.\" 3.\" This documentation was created by Ed Maste under sponsorship of 4.\" The FreeBSD Foundation. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" $FreeBSD$ 28.\" 29.Dd May 3, 2017 30.Dt ARCH 7 31.Os 32.Sh NAME 33.Nm arch 34.Nd Architecture-specific details 35.Sh DESCRIPTION 36Differences between CPU architectures and platforms supported by 37.Fx . 38.Pp 39.Ss Type sizes 40On all supported architectures, 41.Bl -column -offset -indent "long long" "Size" 42.It Sy Type Ta Sy Size 43.It short Ta 2 44.It int Ta 4 45.It long Ta sizeof(void*) 46.It long long Ta 8 47.It float Ta 4 48.It double Ta 8 49.El 50.Bl -column -offset indent "Sy Architecture" "Sy sizeof(void *)" "Sy sizeof(long double)" "Sy sizeof(time_t)" 51.It Sy Architecture Ta Sy sizeof(void *) Ta Sy sizeof(long double) Ta Sy sizeof(time_t) 52.It amd64 Ta 8 Ta 16 Ta 8 53.It arm Ta 4 Ta 8 Ta 8 54.It armeb Ta 4 Ta 8 Ta 8 55.It armv6 Ta 4 Ta 8 Ta 8 56.It arm64 Ta 8 Ta 16 Ta 8 57.It i386 Ta 4 Ta 12 Ta 4 58.It mips Ta 4 Ta 8 Ta 8 59.It mipsel Ta 4 Ta 8 Ta 8 60.It mipselhf Ta 4 Ta 8 Ta 8 61.It mipshf Ta 4 Ta 8 Ta 8 62.It mipsn32 Ta 4 Ta 8 Ta 8 63.It mips64 Ta 8 Ta 8 Ta 8 64.It mips64el Ta 8 Ta 8 Ta 8 65.It mips64elhf Ta 8 Ta 8 Ta 8 66.It mips64hf Ta 8 Ta 8 Ta 8 67.It powerpc Ta 4 Ta 8 Ta 4 68.It powerpcspe Ta 4 Ta 8 Ta 4 69.It powerpc64 Ta 8 Ta 8 Ta 8 70.It riscv64 Ta 8 Ta 16 Ta 8 71.It riscv64sf Ta 8 Ta 16 Ta 8 72.It sparc64 Ta 8 Ta 16 Ta 8 73.El 74.Ss Endianness and Char Signedness 75.Bl -column -offset indent "Sy Architecture" "Sy Endianness" "Sy char Signedness" 76.It Sy Architecture Ta Sy Endianness Ta Sy char Signedness 77.It amd64 Ta little Ta signed 78.It arm Ta little Ta unsigned 79.It armeb Ta big Ta unsigned 80.It armv6 Ta little Ta unsigned 81.It arm64 Ta little Ta unsigned 82.It i386 Ta little Ta signed 83.It mips Ta big Ta signed 84.It mipsel Ta little Ta signed 85.It mipselhf Ta little Ta signed 86.It mipshf Ta big Ta signed 87.It mipsn32 Ta big Ta signed 88.It mips64 Ta big Ta signed 89.It mips64el Ta little Ta signed 90.It mips64elhf Ta little Ta signed 91.It mips64hf Ta big Ta signed 92.It powerpc Ta big Ta unsigned 93.It powerpcspe Ta big Ta unsigned 94.It powerpc64 Ta big Ta unsigned 95.It riscv64 Ta little Ta signed 96.It riscv64sf Ta little Ta signed 97.It sparc64 Ta big Ta signed 98.El 99.Ss Page Size 100.Bl -column -offset indent "Sy Architecture" "Sy Page Sizes" 101.It Sy Architecture Ta Sy Page Sizes 102.It amd64 Ta 4K, 2M, 1G 103.It arm Ta 4K 104.It armeb Ta 4K 105.It armv6 Ta 4K, 1M 106.It arm64 Ta 4K, 2M, 1G 107.It i386 Ta 4K, 2M (PAE), 4M 108.It mips Ta 4K 109.It mipsel Ta 4K 110.It mipselhf Ta 4K 111.It mipshf Ta 4K 112.It mipsn32 Ta 4K 113.It mips64 Ta 4K 114.It mips64el Ta 4K 115.It mips64elhf Ta 4K 116.It mips64hf Ta 4K 117.It powerpc Ta 4K 118.It powerpcspe Ta 4K 119.It powerpc64 Ta 4K 120.It riscv64 Ta 4K 121.It riscv64sf Ta 4K 122.It sparc64 Ta 8K 123.El 124.Ss Floating Point 125.Bl -column -offset indent "Sy Architecture" "Sy float, double" "Sy long double" 126.It Sy Architecture Ta Sy float, double Ta Sy long double 127.It amd64 Ta hard Ta hard, 80 bit 128.It arm Ta soft Ta soft, double precision 129.It armeb Ta soft Ta soft, double precision 130.It armv6 Ta hard Ta hard, double precision 131.It arm64 Ta hard Ta soft, quad precision 132.It i386 Ta hard Ta hard, 80 bit 133.It mips Ta soft Ta identical to double 134.It mipsel Ta soft Ta identical to double 135.It mipselhf Ta hard Ta identical to double 136.It mipshf Ta hard Ta identical to double 137.It mipsn32 Ta soft Ta identical to double 138.It mips64 Ta soft Ta identical to double 139.It mips64el Ta soft Ta identical to double 140.It mips64elhf Ta hard Ta identical to double 141.It mips64hf Ta hard Ta identical to double 142.It powerpc Ta hard Ta hard, double precision 143.It powerpcspe Ta hard Ta hard, double precision 144.It powerpc64 Ta hard Ta hard, double precision 145.It riscv64 Ta hard Ta hard, double precision 146.It riscv64sf Ta soft Ta soft, double precision 147.It sparc64 Ta hard Ta hard, quad precision 148.El 149.Ss Predefined Macros 150The compiler provides a number of predefined macros. 151Some of these provide architecture-specific details and are explained below. 152Other macros, including those required by the language standard, are not 153included here. 154.Pp 155The full set of predefined macros can be obtained with this command: 156.Bd -literal -offset indent 157cc -x c -dM -E /dev/null 158.Ed 159.Pp 160Common type size and endianness macros: 161.Bl -column -offset indent "BYTE_ORDER" "Sy Meaning" 162.It Sy Macro Ta Sy Meaning 163.It Dv __LP64__ Ta 64-bit (8-byte) long and pointer, 32-bit (4-byte) int 164.It Dv __ILP32__ Ta 32-bit (4-byte) int, long and pointer 165.It Dv BYTE_ORDER Ta Either Dv BIG_ENDIAN or Dv LITTLE_ENDIAN . 166.Dv PDP11_ENDIAN 167is not used on 168.Fx . 169.El 170.Pp 171Architecture-specific macros: 172.Bl -column -offset indent "Sy Architecture" "Sy Predefined macros" 173.It Sy Architecture Ta Sy Predefined macros 174.It amd64 Ta Dv __amd64__, Dv __x86_64__ 175.It arm Ta Dv __arm__ 176.It armeb Ta Dv __arm__ 177.It armv6 Ta Dv __arm__, Dv __ARM_ARCH >= 6 178.It arm64 Ta Dv __aarch64__ 179.It i386 Ta Dv __i386__ 180.It mips Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_o32 181.It mipsel Ta Dv __mips__, Dv __mips_o32 182.It mipselhf Ta Dv __mips__, Dv __mips_o32 183.It mipshf Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_o32 184.It mipsn32 Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_n32 185.It mips64 Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_n64 186.It mips64el Ta Dv __mips__, Dv __mips_n64 187.It mips64elhf Ta Dv __mips__, Dv __mips_n64 188.It mips64hf Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_n64 189.It powerpc Ta Dv __powerpc__ 190.It powerpcspe Ta Dv __powerpc__, Dv __SPE__ 191.It powerpc64 Ta Dv __powerpc__, Dv __powerpc64__ 192.It riscv64 Ta Dv __riscv__, Dv __riscv64 193.It riscv64sf Ta Dv __riscv__, Dv __riscv64 194.It sparc64 Ta Dv __sparc64__ 195.El 196.Sh SEE ALSO 197.Xr src.conf 5 , 198.Xr build 7 199.Sh HISTORY 200An 201.Nm 202manual page appeared in 203.Fx 12 . 204