Note:

• b1, b2, and b3, have Boolean values;
• i1, i2, and i3, have integer values;
• r1, r2, and r3, have real values;
• L1 and L2 are quadruple labels; and
• n is an integer constant.

QUADRUPLE				MEANING
				Copying and Converting Scalars
COPYB	b1		b3	b3 := b1
COPYI	i1		i3	i3 := i1
COPYR	r1		r3	r3 := r1
COPYI2R	i1		r3	r3 := i1 converted to a real number.
COPYR2I	r1		i3	i3 := r1 converted to an integer.
				Reading and Writing Array Elements
LDB	i1	b2	b3	b3 := b2[i1]
LDI	i1	i2	i3	i3 := i2[i1]
LDR	i1	r2	r3	r3 := r2[i1]
STB	i1	b2	b3	b3[i1] := b2
STI	i1	i2	i3	i3[i1] := i2
STR	i1	r2	r3	r3[i1] := r2
				Integer Arithmetic
ADDI	i1	i2	i3	i3 := i1 + i2
SUBI	i1	i2	i3	i3 := i1 - i2
MULI	i1	i2	i3	i3 := i1 * i2
DIVI	i1	i2	i3	i3 := i1 / i2
MOD	i1	i2	i3	i3 := i1 mod i2
				Real Arithmetic
ADDR	r1	r2	r3	r3 := r1 + r2
SUBR	r1	r2	r3	r3 := r1 - r2
MULR	r1	r2	r3	r3 := r1 * r2
DIVR	r1	r2	r3	r3 := r1 / r2
				Relational Operators
LTI	i1	i2	b3	set b3 to true if i1 < i2, else set b3 false.
LTEQI	i1	i2	b3	set b3 to true if i1 < i2 or i1 = i2, else set b3 false.
EQI	i1	i2	b3	set b3 to true if i1 = i2, else set b3 false.
NEQI	i1	i2	b3	set b3 to false if i1 = i2, else set b3 true.
LTR	r1	r2	b3	set b3 to true if r1 < r2, else set b3 false.
LTEQR	r1	r2	b3	set b3 to true if r1 < r2 or r1 = r2, else set b3 false.
EQR	r1	r2	b3	set b3 to true if r1 = r2, else set b3 false.
NEQR	r1	r2	b3	set b3 to false if r1 = r2, else set b3 true.
				Logical Operators
AND	b1	b2	b3	b3 := b1 and b2
OR	b1	b2	b3	b3 := b1 or b2
NOT	b1		b3	b3 := not b1
				Branches, Jumps, and Labels
BFALSE	b1	L2		branch to L2 if b1 is false.
JUMP	L1			jump to L1.
LABEL	L1			mark location of label L1.
				Procedure and Function Calls
PARAMB	b1			b1 is an argument in the next CALL, CALLB, CALLI, or CALLR quadruple.
PARAMI	i1			i1 is an argument in the next CALL, CALLB, CALLI, or CALLR quadruple.
PARAMR	r1			r1 is an argument in the next CALL, CALLB, CALLI, or CALLR quadruple.
CALL	n	L2		call procedure L2 using the previous n arguments.
CALLB	n	L2	b3	call Boolean function L2 using the previous n arguments and put returned value in b3.
CALLI	n	L2	i3	call integer function L2 using the previous n arguments and put returned value in i3.
CALLR	n	L2	r3	call real function L2 using the previous n arguments and put returned value in r3.
				Procedure, Function, and Main Program Returns
RET				return from a procedure.
RETB	b1			return from a Boolean function with b1 as the returned value.
RETI	i1			return from an integer function with i1 as the returned value.
RETR	r1			return from a real function with r1 as the returned value.
EXIT				exit from main program.

Kenneth E. Batcher - 9/17/2001