Questions tagged [immediate-operand]
94 questions
-1
votes
1 answer
In ARM machine code, how is the offset encoded in SUB SP, SP, #36?
Edit:
My concern is how ARM instruction is encoded.
Let's examine below example:
194640: e92d40f0 push {r4, r5, r6, r7, lr}
194644: e24dd024 sub sp, sp, #36 ; 0x24
--> sp decrease 36 ~ 0x24 --> Is it calculated by e24dd024 &…
Ngoc Hoang Nguyen
- 19
- 3
-1
votes
1 answer
MIPS Pipeline stages for Load Immediate
I understand there are 5 standard stages for an instruction in MIPS. for the following pseudo instruction
li $t1, 0 # pseudo-instruction for addi $t1, $zero, 0
Can anyone please confirm if this uses all 5 stages? I think underlying this is an…
Jason Hyland
- 744
- 1
- 8
- 21
-1
votes
1 answer
What if an immediate number is out of range before signed number operations
One of my homework exercises is as follows:
mov al,77h
sub al,80h
AL=_______
CF=_______
OF=_______
When I first saw it, I thought the result of positive number minus positive number won't overflow. And I just made OF equals to 0.
But my…
LEMING YU
- 3
- 3
-2
votes
2 answers
Why opcode is 6-bit long in MIPS 32 bit Architecture
Below is Data transfer instruction format for 32-bit ARM and MIPS architecture. 32-bit ARM architecture have 4 bit opcode because there are 16 registers (2^4=16).32-bit MIPS architecture have 6 bit opcode. Should not it be 5 bits considering there…
Tom
- 19
- 2
- 6