term% cat index.txt MULDIV(2) System Calls Manual 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.
MULDIV(2)