MACLO | CS+ V7.00.00

MACLO	Multiply-Accumulate the low-order word	MACLO
	Multiply-ACcumulate LOw-order word

[Syntax]

(1)	MACLO src, src2

(2)	MACLO src, src2, Adest [V2.01.00 or later]

[Operation]

(1)	signed short tmp1, tmp2;

signed long long tmp3;

tmp1 = (signed short) src;

tmp2 = (signed short) src2;

tmp3 = (signed long) tmp1 * (signed long) tmp2;

ACC = ACC + (tmp3 << 16);

(2)	signed short tmp1, tmp2;

signed 72bit tmp3;

tmp1 = (signed short) src;

tmp2 = (signed short) src2;

tmp3 = (signed long) tmp1 * (signed long) tmp2;

Adest = Adest + (tmp3 << 16); [V2.01.00 or later]

[Function]

(1)

This instruction multiplies the lower-order 16 bits of src by the lower-order 16 bits of src2, and adds the result to the value in the accumulator (ACC). The addition is performed with the least significant bit of the result of multiplication corresponding to bit 16 of ACC. The result of addition is stored in ACC. The lower-order 16 bits of src and the lower-order 16 bits of src2 are treated as signed integers.

(2)

This instruction multiplies the lower-order 16 bits of src by the lower-order 16 bits of src2, and adds the result to the value in the accumulator (ACC0 or ACC1). The addition is performed with the least significant bit of the result of multiplication corresponding to bit 16 of ACC. The result of addition is stored in ACC. The lower-order 16 bits of src and the lower-order 16 bits of src2 are treated as signed integers. You can assemble assembly-language code that includes this instruction if you have specified the assembler option -isa with selection of the instruction set of the RXv2 or a later version. [V2.01.00 or later]

[Instruction Format]

Syntax	Operand			Code Size (Byte)
Syntax	src	src2	Adest	Code Size (Byte)
(1) MACLO src, src2	Rs	Rs2	−	3
(2) MACLO src, src2, Adest [V2.01.00 or later]	Rs	Rs2	A0, A1	3

Note	Specify A0 (ACC0) or A1 (ACC1) as Adest.

[Flag Change]

-	This instruction does not affect the states of flags.

[Description Example]

MACLO R1, R2

MACLO R1, R2, A1