Texas Instruments TMS320C67X/C67X+ DSP manual Normalize Integer

NORM			Normalize Integer
					Normalize Integer
	NORM
Syntax						NORM (.unit) src2, dst
						.unit = .L1 or .L2
Compatibility						C62x, C64x, C67x, and C67x+ CPU
Opcode
31		29	28	27	23		22	18	17	13	12	11	5	4	3	2	1	0

creg

z

dst

src2

0 0 0 0 0 x

op

1 1 0 s

p

3 155171 1

Opcode map field used...	For operand type...	Unit	Opfield
src2	xsint	.L1, .L2	110 0011
dst	uint
src2	slong	.L1, .L2	110 0000
dst	uint

Description

src2

src2

The number of redundant sign bits of src2 is placed in dst. Several examples are shown in the following diagram.

In this case, NORM returns 0:

	0	1	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x
31		30	29	28	27 26 25 24 23 22 21 20 19									18 17 16 15 14 13 12							11 10		9	8	7	6	5	4	3	2	1	0
In this case, NORM returns 3:
	0	0	0	0	1	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x	x
31		30	29	28	27 26 25 24 23 22 21 20 19									18 17 16 15 14 13 12							11 10		9	8	7	6	5	4	3	2	1	0

src2

src2

In this case, NORM returns 30:

1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	0
31	30	29	28	27 26		25	24 23		22	21	20 19		18	17	16	15	14	13	12	11 10		9	8	7	6	5	4	3	2	1	0
In this case, NORM returns 31:
1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
31	30	29	28	27 26		25	24 23		22	21	20 19		18	17	16	15	14	13	12	11 10		9	8	7	6	5	4	3	2	1	0

3-192 Instruction Set SPRU733