UM*

( u1 u2 — ud )

Core

Multiply u1 by u2, leaving the double-precision result ud. All values and arith-

metic are unsigned. “U-M-star”

2.2.2

Logical and Relational Operations

Glossary Single-Precision Logical Operations

ABS

( n — +n )

Core

Replace the top stack item with its absolute value.

AND

( x1 x2 — x3 )

Core

Return x3, the bit-by-bit logical and of x1 with x2.

INVERT

( x1 — x2 )

Core

Invert all bits of x1, giving its logical inverse x2.

MAX

( n1 n2 — n3 )

Core

Return n3, the greater of n1 and n2.

MIN

( n1 n2 — n3 )

Core

Return n3, the lesser of n1 and n2.

NEGATE

( n — -n )

Core

Change the sign of the top stack value; if the value was negative, it becomes

positive. The phrase NEGATE 1- is equivalent to INVERT (one’s complement

of the input value).

OR

( x1 x2 — x3 )

Core

Return x3, the bit-by-bit inclusive or of x1 with x2.

WITHIN

( x1 x2 x3 — flag )

Core