Texas Instruments TMS320C67X/C67X+ DSP Subtract Two Double-Precision Floating-Point Values, Subdp

SUBDP Subtract Two Double-Precision Floating-Point Values

				Subtract Two Double-Precision Floating-Point Values
SUBDP
Syntax					SUBDP (.unit) src1, src2, dst							(C67x and C67x+ CPU)
					.unit = .L1 or .L2
					or
					SUBDP (.unit) src1, src2, dst							(C67x+ CPU only)
					.unit = .S1 or .S2
Compatibility					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

src1

x

op

1 1

0s

p

3	1	5		5	5	1	7	1	1
			Opcode map field used...		For operand type...		Unit	Opfield
			src1		dp		.L1, .L2	001 1001
			src2		xdp
			dst		dp
			src1		xdp		.L1, .L2	001 1101
			src2		dp
			dst		dp
			src1		dp		.S1, .S2	111 0011
			src2		xdp
			dst		dp
			src1		dp		.S1, .S2	111 0111
			src2		xdp			src2 − src1
			dst		dp
			Note:
			The assembly syntax allows a cross-path operand to be used for either src1
			or src2. The assembler selects between the two opcodes based on which
			source operand in the assembly instruction requires the cross path. If src1
			requires the cross path, the assembler chooses the second (reverse) form
			of the instruction syntax and reverses the order of the operands in the
			encoded instruction.
Description			src2 is subtracted from src1. The result is placed in dst.
Execution			if (cond)	src1 − src2 → dst
			else	nop

3-260 Instruction Set SPRU733