MULDIV(2)MULDIV(2)
NAME
muldiv, umuldiv – high-precision multiplication and division
SYNOPSIS
#include <u.h>
#include <libc.h>
long muldiv(long a, long b, long c)
ulong umuldiv(ulong a, ulong b, ulong c)
DESCRIPTION
Muldiv
returns
a*b/c,
using a
vlong
to hold the intermediate result.
Umuldiv
is the equivalent for unsigned integers.
They can be used to scale integer values without worry about
overflowing the intermediate result.
On some architectures, these routines can generate a trap if the
final result does not fit in a
long
or
ulong;
on others they will silently truncate.