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Q_SIGNSHFT(3) BSD Library Functions Manual Q_SIGNSHFT(3) NAME Q_SIGNSHFT, Q_SSIGN, Q_CRAWMASK, Q_SRAWMASK, Q_GCRAW, Q_GCVAL, Q_SCVAL -- fixed-point math functions which manipulate the control/sign data bits SYNOPSIS #include <sys/qmath.h> uint32_t Q_SIGNSHFT(QTYPE q); QTYPE Q_SSIGN(QTYPE q, bool isneg); ITYPE Q_CRAWMASK(QTYPE q); ITYPE Q_SRAWMASK(QTYPE q); ITYPE Q_GCRAW(QTYPE q); ITYPE Q_GCVAL(QTYPE q); QTYPE Q_SCVAL(QTYPE q, ITYPE cv); DESCRIPTION Q_SIGNSHFT() gets the bit position of q's sign bit relative to bit zero. Q_SSIGN() sets the sign bit of q based on the boolean isneg. Q_CRAWMASK() and Q_SRAWMASK() return q-specific bit masks for q's control bits and sign bit respectively. Q_GCRAW() and Q_GCVAL() get the raw masked control bits and value of q's control bits respectively. Q_SCVAL() sets q's control bits to the value cv. 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_SIGNSHFT() returns the sign bit's position as an integer. Q_SSIGN() returns the value of q post change. Q_CRAWMASK(), Q_SRAWMASK(), Q_GCRAW() and Q_GCVAL() return their respec- tive values as integers of the same underlying ITYPE as q. Q_SCVAL() returns the value of q post change. 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 <lstewart@FreeBSD.org> and sponsored by Netflix, Inc. BSD July 8, 2018 BSD
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | HISTORY | AUTHORS
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