1.\" $OpenBSD: fma.3,v 1.3 2013/06/05 03:40:26 tedu Exp $ 2.\" 3.\" Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: June 5 2013 $ 18.Dt FMA 3 19.Os 20.Sh NAME 21.Nm fma , 22.Nm fmaf , 23.Nm fmal 24.Nd floating multiply-add 25.Sh SYNOPSIS 26.In math.h 27.Ft double 28.Fn fma "double x" "double y" "double z" 29.Ft float 30.Fn fmaf "float x" "float y" "float z" 31.Ft long double 32.Fn fmal "long double x" "long double y" "long double z" 33.Sh DESCRIPTION 34The 35.Fn fma , 36.Fn fmaf 37and 38.Fn fmal 39functions compute (x * y) + z, rounded as one ternary operation. 40The result is rounded according to the current rounding mode. 41.Sh RETURN VALUES 42The 43.Fn fma , 44.Fn fmaf 45and 46.Fn fmal 47functions return (x * y) + z, rounded as one ternary operation. 48.Sh SEE ALSO 49.Xr fegetround 3 , 50.Xr remainder 3 51.Sh STANDARDS 52The 53.Fn fma , 54.Fn fmaf 55and 56.Fn fmal 57functions conform to 58.St -isoC-99 . 59