Cmpeq, Compare for equal (dalu), Instruction formats and opcodes – Freescale Semiconductor StarCore SC140 User Manual
Page 431: Instruction fields, Operation assembler syntax
CMPEQ
SC140 DSP Core Reference Manual
A-117
CMPEQ
Compare for Equal (DALU)
CMPEQ
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example
cmpeq d2,d3
Instruction Formats and Opcodes
Note:
** indicates serial grouping encoding.
Instruction Fields
Da
JJJ
Single Source Data Register
Operation
Assembler Syntax
If Da == Dn, then 1
→ T, else 0 → T
CMPEQ Da,Dn
CMPEQ Da,Dn
Compares the 40-bit contents of two data registers (Da and Dn), setting the T bit if they are equal, and
clearing the T bit if they are not.
Register Address
Bit Name
Description
SR[1]
T
Sets T bit if equal, otherwise cleared.
Register/Memory Address
Before
After
D2
$00 0000 0005
D3
$00 0000 0005
SR
$00E4 0000
$00E4 0002
Instruction
Words Cycles Type
Opcode
15
8
7
0
CMPEQ Da,Dn
1
1
1
0
*
1
1
0
0
F
F
F
1
1
0
0
J
J
J
000
D0
010
D2
100
D4
110
D6
001
D1
011
D3
101
D5
111
D7
Note:
This instruction can specify D8-D15 as operands by using a prefix.