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 2, 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 riscv Ta 8 Ta 16 Ta 8 71.It sparc64 Ta 8 Ta 16 Ta 8 72.El 73.Ss Endianness and Char Signedness 74.Bl -column -offset indent "Sy Architecture" "Sy Endianness" "Sy char Signedness" 75.It Sy Architecture Ta Sy Endianness Ta Sy char Signedness 76.It amd64 Ta little Ta signed 77.It arm Ta little Ta unsigned 78.It armeb Ta big Ta unsigned 79.It armv6 Ta little Ta unsigned 80.It arm64 Ta little Ta unsigned 81.It i386 Ta little Ta signed 82.It mips Ta big Ta signed 83.It mipsel Ta little Ta signed 84.It mipselhf Ta little Ta signed 85.It mipshf Ta big Ta signed 86.It mipsn32 Ta big Ta signed 87.It mips64 Ta big Ta signed 88.It mips64el Ta little Ta signed 89.It mips64elhf Ta little Ta signed 90.It mips64hf Ta big Ta signed 91.It powerpc Ta big Ta unsigned 92.It powerpcspe Ta big Ta unsigned 93.It powerpc64 Ta big Ta unsigned 94.It riscv Ta little Ta signed 95.It sparc64 Ta big Ta signed 96.El 97.Ss Page Size 98.Bl -column -offset indent "Sy Architecture" "Sy Page Sizes" 99.It Sy Architecture Ta Sy Page Sizes 100.It amd64 Ta 4K, 2M, 1G 101.It arm Ta 4K 102.It armeb Ta 4K 103.It armv6 Ta 4K, 1M 104.It arm64 Ta 4K, 2M, 1G 105.It i386 Ta 4K, 2M (PAE), 4M 106.It mips Ta 4K 107.It mipsel Ta 4K 108.It mipselhf Ta 4K 109.It mipshf Ta 4K 110.It mipsn32 Ta 4K 111.It mips64 Ta 4K 112.It mips64el Ta 4K 113.It mips64elhf Ta 4K 114.It mips64hf Ta 4K 115.It powerpc Ta 4K 116.It powerpcspe Ta 4K 117.It powerpc64 Ta 4K 118.It riscv Ta 4K 119.It sparc64 Ta 8K 120.El 121.Ss Floating Point 122.Bl -column -offset indent "Sy Architecture" "Sy float, double" "Sy long double" 123.It Sy Architecture Ta Sy float, double Ta Sy long double 124.It amd64 Ta hard Ta hard, 80 bit 125.It arm Ta soft Ta soft, double precision 126.It armeb Ta soft Ta soft, double precision 127.It armv6 Ta hard Ta hard, double precision 128.It arm64 Ta hard Ta soft, quad precision 129.It i386 Ta hard Ta hard, 80 bit 130.It mips Ta soft Ta identical to double 131.It mipsel Ta soft Ta identical to double 132.It mipselhf Ta hard Ta identical to double 133.It mipshf Ta hard Ta identical to double 134.It mipsn32 Ta soft Ta identical to double 135.It mips64 Ta soft Ta identical to double 136.It mips64el Ta soft Ta identical to double 137.It mips64elhf Ta hard Ta identical to double 138.It mips64hf Ta hard Ta identical to double 139.It powerpc Ta hard Ta hard, double precision 140.It powerpcspe Ta hard Ta hard, double precision 141.It powerpc64 Ta hard Ta hard, double precision 142.It riscv64 Ta hard Ta hard, double precision 143.It riscv64sf Ta soft Ta soft, double precision 144.It sparc64 Ta hard Ta hard, quad precision 145.El 146.Ss Predefined Macros 147The compiler provides a number of predefined macros. 148Some of these provide architecture-specific details and are explained below. 149Other macros, including those required by the language standard, are not 150included here. 151.Pp 152The full set of predefined macros can be obtained with this command: 153.Bd -literal -offset indent 154cc -x c -dM -E /dev/null 155.Ed 156.Pp 157Common type size and endianness macros: 158.Bl -column -offset indent "BYTE_ORDER" "Sy Meaning" 159.It Sy Macro Ta Sy Meaning 160.It Dv __LP64__ Ta 64-bit (8-byte) long and pointer, 32-bit (4-byte) int 161.It Dv __ILP32__ Ta 32-bit (4-byte) int, long and pointer 162.It Dv BYTE_ORDER Ta Either Dv BIG_ENDIAN or Dv LITTLE_ENDIAN . 163.Dv PDP11_ENDIAN 164is not used on 165.Fx . 166.El 167.Pp 168Architecture-specific macros: 169.Bl -column -offset indent "Sy Architecture" "Sy Predefined macros" 170.It Sy Architecture Ta Sy Predefined macros 171.It amd64 Ta Dv __amd64__, Dv __x86_64__ 172.It arm Ta Dv __arm__ 173.It armeb Ta Dv __arm__ 174.It armv6 Ta Dv __arm__, Dv __ARM_ARCH >= 6 175.It arm64 Ta Dv __aarch64__ 176.It i386 Ta Dv __i386__ 177.It mips Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_o32 178.It mipsel Ta Dv __mips__, Dv __mips_o32 179.It mipselhf Ta Dv __mips__, Dv __mips_o32 180.It mipshf Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_o32 181.It mipsn32 Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_n32 182.It mips64 Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_n64 183.It mips64el Ta Dv __mips__, Dv __mips_n64 184.It mips64elhf Ta Dv __mips__, Dv __mips_n64 185.It mips64hf Ta Dv __mips__, Dv __MIPSEB__, Dv __mips_n64 186.It powerpc Ta Dv __powerpc__ 187.It powerpcspe Ta Dv __powerpc__, Dv __SPE__ 188.It powerpc64 Ta Dv __powerpc__, Dv __powerpc64__ 189.It riscv Ta Dv __riscv__, Dv __riscv64 190.It sparc64 Ta Dv __sparc64__ 191.El 192.Sh SEE ALSO 193.Xr src.conf 5 , 194.Xr build 7 195.Sh HISTORY 196An 197.Nm 198manual page appeared in 199.Fx 12 . 200