Excalibur electronic A-MNL-NIOSPROG-01.1 用户手册
Altera Corporation
99
32323232
32-Bit Instruction Set
2
3
2
-B
it In
st
st
ru
ctio
n
n
Se
t
t
SUB
Subtract
Operation:
RA
← RA − RB
Assembler Syntax:
SUB %rA,%rB
Example:
SUB %i3,%g0 ; SUB %g0 from %i3
Description:
Subtracts the contents of RB from RA, stores result in RA.
Condition Codes:
Flags:
N: Result bit 31
V: Signed-arithmetic overflow
V: Signed-arithmetic overflow
Z: Set if result is zero; cleared otherwise
C: Set if there was a borrow from the subtraction; cleared otherwise
C: Set if there was a borrow from the subtraction; cleared otherwise
Instruction Format:
RR
Instruction Fields:
A = Register index of RA operand
B = Register index of RB operand
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
1
0
B
A
N
V
Z
C
∆
∆
∆
∆