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.Dd July 8, 2018
.Dt Q_IFRAWMASK 3
.Os
.Sh NAME
.Nm Q_IFRAWMASK ,
.Nm Q_IFVALIMASK ,
.Nm Q_IFVALFMASK ,
.Nm Q_GIFRAW ,
.Nm Q_GIFABSVAL ,
.Nm Q_GIFVAL ,
.Nm Q_SIFVAL ,
.Nm Q_SIFVALS
.Nd fixed-point math functions which manipulate the combined integer/fractional
data bits
.Sh SYNOPSIS
.In sys/qmath.h
.Ft ITYPE
.Fn Q_IFRAWMASK "QTYPE q"
.Ft ITYPE
.Fn Q_IFVALIMASK "QTYPE q"
.Ft ITYPE
.Fn Q_IFVALFMASK "QTYPE q"
.Ft ITYPE
.Fn Q_GIFRAW "QTYPE q"
.Ft ITYPE
.Fn Q_GIFABSVAL "QTYPE q"
.Ft ITYPE
.Fn Q_GIFVAL "QTYPE q"
.Ft QTYPE
.Fn Q_SIFVAL "QTYPE q" "ITYPE ifv"
.Ft QTYPE
.Fn Q_SIFVALS "QTYPE q" "ITYPE iv" "ITYPE fv"
.Sh DESCRIPTION
.Fn Q_IFRAWMASK
returns a
.Fa q Ns -specific
bit mask for
.Fa q Ap s
combined integer and fractional data bits.
.Pp
.Fn Q_IFVALIMASK
and
.Fn Q_IFVALFMASK
return
.Fa q Ns -specific
bit masks for the integer and fractional bits of
.Fa q Ap s
combined integer and fractional data bits value, i.e., are applicable to the
values returned by
.Fn Q_GIFABSVAL
and
.Fn Q_GIFVAL .
.Pp
.Fn Q_GIFRAW
returns
.Fa q Ap s
raw masked integer/fractional data bits.
.Pp
.Fn Q_GIFABSVAL
and
.Fn Q_GIFVAL
return the absolute and real values of
.Fa q Ap s
integer/fractional data bits respectively.
.Pp
.Fn Q_SIFVAL
sets
.Fa q Ap s
combined integer/fractional data bits to the value
.Fa ifv ,
whereas
.Fn Q_SIFVALS
independently sets
.Fa q Ap s
integer and fractional data bits to the separate values
.Fa iv
and
.Fa fv .
.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_IFRAWMASK ,
.Fn Q_IFVALIMASK ,
.Fn Q_IFVALFMASK ,
.Fn Q_GIFABSVAL ,
.Fn Q_GIFVAL ,
.Fn Q_GIFRAW ,
.Fn Q_GIFABSVAL
and
.Fn Q_GIFVAL
return their respective values as integers of the same underlying ITYPE as
.Fa q .
.Pp
.Fn Q_SIFVAL
and
.Fn Q_SIFVALS
return the value of
.Fa q
post change.
.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.