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				.\"
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				.\" $FreeBSD$
				.\"
				.Dd July 8, 2018
				.Dt Q_QADDI 3
				.Os
				.Sh NAME
				.Nm Q_QADDI ,
				.Nm Q_QDIVI ,
				.Nm Q_QMULI ,
				.Nm Q_QSUBI ,
				.Nm Q_QFRACI ,
				.Nm Q_QCPYVALI
				.Nd fixed-point math functions which apply integers to a Q number
				.Sh SYNOPSIS
				.In sys/qmath.h
				.Ft int
				.Fn Q_QADDI "QTYPE *a" "ITYPE b"
				.Ft int
				.Fn Q_QDIVI "QTYPE *a" "ITYPE b"
				.Ft int
				.Fn Q_QMULI "QTYPE *a" "ITYPE b"
				.Ft int
				.Fn Q_QSUBI "QTYPE *a" "ITYPE b"
				.Ft int
				.Fn Q_QFRACI "QTYPE *q" "ITYPE n" "ITYPE d"
				.Ft int
				.Fn Q_QCPYVALI "QTYPE *q" "ITYPE i"
				.Sh DESCRIPTION
				The
				.Fn Q_QADDI ,
				.Fn Q_QDIVI ,
				.Fn Q_QMULI
				and
				.Fn Q_QSUBI
				functions add, divide, multiply or subtract
				.Fa b
				to/by/from
				.Fa a
				respectively, storing the result in
				.Fa a .
				.Pp
				The
				.Fn Q_QFRACI
				function computes the fraction
				.Fa n
				divided by
				.Fa d
				and stores the fixed-point result in
				.Fa q .
				.Pp
				The
				.Fn Q_QCPYVALI
				function overwrites
				.Fa q Ap s
				integer and fractional bits with the Q representation of integer value
				.Fa i .
				.Pp
				All of those functions operate on
				the following data types:
				.Vt s8q_t ,
				.Vt u8q_t ,
				.Vt s16q_t ,
				.Vt u16q_t ,
				.Vt s32q_t ,
				.Vt u32q_t ,
				.Vt s64q_t ,
				and
				.Vt u64q_t ,
				which are referred to generically as
				.Fa QTYPE .
				The
				.Fa ITYPE
				refers to the
				.Xr stdint 7
				integer types.
				.Pp
				For more details, see
				.Xr qmath 3 .
				.Sh RETURN VALUES
				.Fn Q_QADDI ,
				.Fn Q_QDIVI ,
				.Fn Q_QMULI ,
				.Fn Q_QSUBI ,
				.Fn Q_QFRACI
				and
				.Fn Q_QCPYVALI
				functions return 0 on success, or an errno on failure.
				.Er EINVAL
				is returned for divide-by-zero.
				.Er EOVERFLOW
				and
				.Er ERANGE
				are returned for overflow and underflow respectively.
				.Sh SEE ALSO
				.Xr errno 2 ,
				.Xr qmath 3 ,
				.Xr stdint 7
				.Sh HISTORY
				The
				.Xr qmath 3
				functions first appeared in
				.Fx 13.0 .
				.Sh AUTHORS
				.An -nosplit
				The
				.Xr qmath 3
				functions and this manual page were written by
				.An Lawrence Stewart Aq Mt lstewart@FreeBSD.org
				and sponsored by Netflix, Inc.