Q_FRAWMASK(3) FreeBSD Library Functions Manual Q_FRAWMASK(3)
NAME
Q_FRAWMASK, Q_GFRAW, Q_GFABSVAL, Q_GFVAL, Q_SFVAL - fixed-point math
functions which manipulate the fractional data bits
SYNOPSIS
#include <sys/qmath.h>
ITYPE
Q_FRAWMASK(QTYPE q);
ITYPE
Q_GFRAW(QTYPE q);
ITYPE
Q_GFABSVAL(QTYPE q);
ITYPE
Q_GFVAL(QTYPE q);
QTYPE
Q_SFVAL(QTYPE q, ITYPE fv);
DESCRIPTION
Q_FRAWMASK() returns a q-specific bit mask for q's fractional data bits.
Q_GFRAW() returns q's raw masked fractional data bits.
Q_GFABSVAL() and Q_GFVAL() return the absolute and real values of q's
fractional data bits respectively.
Q_SFVAL() sets q's fractional data bits to the value fv.
All of those functions operate on the following data types: s8q_t, u8q_t,
s16q_t, u16q_t, s32q_t, u32q_t, s64q_t, and u64q_t, which are referred to
generically as QTYPE. The ITYPE refers to the stdint(7) integer types.
For more details, see qmath(3).
RETURN VALUES
Q_FRAWMASK(), Q_GFRAW(), Q_GFABSVAL() and Q_GFVAL() return their
respective values as integers of the same underlying ITYPE as q.
Q_SFVAL() returns the value of q post set.
SEE ALSO
errno(2), qmath(3), stdint(7)
HISTORY
The qmath(3) functions first appeared in FreeBSD 13.0.
AUTHORS
The qmath(3) functions and this manual page were written by Lawrence
Stewart <
[email protected]> and sponsored by Netflix, Inc.
FreeBSD 14.1-RELEASE-p8 July 8, 2018 FreeBSD 14.1-RELEASE-p8