Math Processor Unit Library

.TH idec 3  "December 27, 2024" "libmpu" "LibMPU Programmer's Manual"
.SH NAME
\fBidec\fP \- decrement
.SH SYNOPSIS
.nf
.B #include <libmpu.h>
.PP
.BI "void idec( mpu_int *" c ", mpu_int *" a ", int " nb " );
.fi
.SH DESCRIPTION
The \fBidec()\fP function performs the decrement operation (c = a \- 1) of the \fBa\fP operand.
The result is placed at address \fBc\fP. The contents of the memory at address \fBa\fP remain
unchanged, and the previous memory contents at \fBc\fP are lost. The \fBnb\fP parameter determines
the size of operands (in bytes) located at addresses \fBc\fP, \fBa\fP.
.PP
The function affects the flags \fBA\fP, \fBO\fP, \fBP\fP, \fBS\fP, \fBZ\fP.
.PP
The \fBC\fP flag does not change (the previous value is retained). The \fBP\fP flag is set only
when the flag is set only when the size of the \fBc\fP, \fBa\fP operands is one or two bytes
(\fBnb\fP == 1 || \fBnb\fP == 2).
.sp
.SH SEE ALSO
.BR iadd(3),
.BR isub(3),
.BR iadc(3),
.BR isbb(3),
.BR ishl(3),
.BR ishr(3),
.BR isal(3),
.BR isar(3),
.BR irol(3),
.BR iror(3),
.BR ircl(3),
.BR ircr(3),
.BR ishln(3),
.BR ishrn(3),
.BR isaln(3),
.BR isarn(3),
.BR iroln(3),
.BR irorn(3),
.BR ircln(3),
.BR ircrn(3),
.BR ineg(3),
.BR inot(3),
.BR iand(3),
.BR itest(3),
.BR icmp(3),
.BR ior(3),
.BR ixor(3),
.BR iinc(3),
.BR ixchg(3),
.BR icpy(3),
.BR icvt(3),
.BR imul(3),
.BR ismul(3),
.BR idiv(3),
.BR isdiv(3),
.BR iatoi(3),
.BR iatoui(3),
.BR iitoa(3),
.BR iuitoa(3).