Subdp – Texas Instruments TMS320C67X/C67X+ DSP User Manual
Page 320
SUBDP
Subtract Two Double-Precision Floating-Point Values
3-260
Instruction Set
SPRU733
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 0 s p
3
1
5
5
5
1
7
1
1
Opcode map field used...
For operand type...
Unit
Opfield
src1
src2
dst
dp
xdp
dp
.L1, .L2
001 1001
src1
src2
dst
xdp
dp
dp
.L1, .L2
001 1101
src1
src2
dst
dp
xdp
dp
.S1, .S2
111 0011
src1
src2
dst
dp
xdp
dp
.S1, .S2
111 0111
src2 − src1
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