42 lines
786 B
ArmAsm
42 lines
786 B
ArmAsm
# print -32 in 8-bit two-complement binary
|
|
.text
|
|
main:
|
|
li $t0, -32 # t0 = -32
|
|
li $t1, 0 # t1 = 0
|
|
li $t8, 8 # t8 = 8
|
|
|
|
reverse:
|
|
beqz $t8, prefix # if (!t8) goto prefix
|
|
andi $t2, $t0, 1 # t2 = t0 & 1
|
|
sra $t0, $t0, 1 # t0 >>= 1
|
|
sll $t1, $t1, 1 # t1 <<= 1
|
|
add $t1, $t1, $t2 # t1 += t2
|
|
addi $t8, $t8, -1 # t8--
|
|
j reverse # goto reverse
|
|
|
|
prefix:
|
|
li $v0, 11 # print character
|
|
li $a0, 48 # 0
|
|
syscall
|
|
li $v0, 11 # print character
|
|
li $a0, 98 # b
|
|
syscall
|
|
li $t8, 8 # t8 = 8
|
|
|
|
print:
|
|
beqz $t8, end # if (!t8) goto end
|
|
li $v0, 1 # print integre
|
|
andi $a0, $t1, 1 # a0 = t1 & 1
|
|
syscall
|
|
sra $t1, $t1, 1 # t1 >>= 1
|
|
addi $t8, $t8, -1 # t8--
|
|
j print # goto print
|
|
|
|
end:
|
|
li $v0, 11 # print character
|
|
li $a0, 10 # newline
|
|
syscall
|
|
|
|
li $v0, 10 # terminate
|
|
syscall
|