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[mips] Finish chapter 3

This commit is contained in:
Nguyễn Gia Phong 2020-02-28 22:09:59 +07:00
parent 70c413d6c8
commit 29cd51b760
10 changed files with 291 additions and 0 deletions
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41
mips/chapter-3/exercise-10.s Normal file
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# print -35 in 8-bit two-complement binary
.text
main:
li $t0, -35 # t0 = -35
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

41
mips/chapter-3/exercise-11.s Normal file
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# 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

18
mips/chapter-3/exercise-13.s Normal file
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# print(int('204', 8))
.text
main:
li $t0, 0 # t0 = 0
addi $t0, $t0, 2 # t0 += 2
sll $t0, $t0, 6 # t0 *= 8 * 8
addi $t0, $t0, 4 # t0 += 4
li $v0, 1 # print integer
move $a0, $t0 # at t0
syscall
li $v0, 11 # print character
li $a0, 10 # newline
syscall
li $v0, 10 # terminate
syscall

19
mips/chapter-3/exercise-14.s Normal file
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# print(int('204', 7))
.text
main:
li $t0, 0 # t0 = 0
addi $t0, $t0, 2 # t0 += 2
li $t1, 49 # t1 = 7 * 7
mul $t0, $t0, $t1 # t0 *= t1
addi $t0, $t0, 4 # t0 += 4
li $v0, 1 # print integer
move $a0, $t0 # at t0
syscall
li $v0, 11 # print character
li $a0, 10 # newline
syscall
li $v0, 10 # terminate
syscall

19
mips/chapter-3/exercise-15.s Normal file
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# print(int('204', 6))
.text
main:
li $t0, 0 # t0 = 0
addi $t0, $t0, 2 # t0 += 2
li $t1, 36 # t1 = 6 * 6
mul $t0, $t0, $t1 # t0 *= t1
addi $t0, $t0, 4 # t0 += 4
li $v0, 1 # print integer
move $a0, $t0 # at t0
syscall
li $v0, 11 # print character
li $a0, 10 # newline
syscall
li $v0, 10 # terminate
syscall

19
mips/chapter-3/exercise-16.s Normal file
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# print(int('204', 5))
.text
main:
li $t0, 0 # t0 = 0
addi $t0, $t0, 2 # t0 += 2
li $t1, 25 # t1 = 5 * 5
mul $t0, $t0, $t1 # t0 *= t1
addi $t0, $t0, 4 # t0 += 4
li $v0, 1 # print integer
move $a0, $t0 # at t0
syscall
li $v0, 11 # print character
li $a0, 10 # newline
syscall
li $v0, 10 # terminate
syscall

20
mips/chapter-3/exercise-3.s Normal file
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# t0 = 0b10101, using only bit shift and add
.text
main:
li $t0, 0 # t0 = 0
addi $t0, $t0, 1 # t0++
sll $t0, $t0, 2 # t0 <<= 2
addi $t0, $t0, 1 # t0++
sll $t0, $t0, 2 # t0 <<= 2
addi $t0, $t0, 1 # t0++
li $v0, 1 # print integer
move $a0, $t0 # at t0
syscall
li $v0, 11 # print character
li $a0, 10 # newline
syscall
li $v0, 10 # terminate
syscall

20
mips/chapter-3/exercise-4.s Normal file
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# t0 = 0b11001, using only bit shift and add
.text
main:
li $t0, 0 # t0 = 0
addi $t0, $t0, 1 # t0++
sll $t0, $t0, 1 # t0 <<= 1
addi $t0, $t0, 1 # t0++
sll $t0, $t0, 3 # t0 <<= 3
addi $t0, $t0, 1 # t0++
li $v0, 1 # print integer
move $a0, $t0 # at t0
syscall
li $v0, 11 # print character
li $a0, 10 # newline
syscall
li $v0, 10 # terminate
syscall

47
mips/chapter-3/exercise-6.s Normal file
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# print(hex(0b10101))
.text
main:
li $t0, 21 # t0 = 0b10101
li $t1, 0 # t1 = 0
li $t9, 9 # t9 = 9
reverse:
beqz $t0, done # if (!t0) goto done
andi $t2, $t0, 0xf # t2 = t0 & 0xf
sra $t0, $t0, 4 # t0 >>= 4
sll $t1, $t1, 4 # t1 <<= 4
add $t1, $t1, $t2 # t1 += t2
j reverse # goto reverse
done:
li $v0, 11 # print character
li $a0, 48 # 0
syscall
li $v0, 11 # print character
li $a0, 120 # x
syscall
bnez $t1, print # if (!t1) goto print
li $v0, 11 # print character
li $a0, 48 # 0
syscall
j end # goto end
print:
beqz $t1, end # if (!t1) goto end
andi $t2, $t1, 0xf # t2 = t1 & 0xf
sra $t1, $t1, 4 # t1 >>= 4
addi $a0, $t2, 48 # a0 = chr(t2), sort of
ble $t2, $t9, put # if (t2 <= 9) goto put
addi $a0, $a0, 7 # a0 += 7
put:
li $v0, 11 # print character at a0
syscall
j print # goto print
end:
li $v0, 11 # print character
li $a0, 10 # newline
syscall
li $v0, 10 # terminate
syscall

47
mips/chapter-3/exercise-7.s Normal file
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# print(hex(0b11001))
.text
main:
li $t0, 25 # t0 = 0b11001
li $t1, 0 # t1 = 0
li $t9, 9 # t9 = 9
reverse:
beqz $t0, done # if (!t0) goto done
andi $t2, $t0, 0xf # t2 = t0 & 0xf
sra $t0, $t0, 4 # t0 >>= 4
sll $t1, $t1, 4 # t1 <<= 4
add $t1, $t1, $t2 # t1 += t2
j reverse # goto reverse
done:
li $v0, 11 # print character
li $a0, 48 # 0
syscall
li $v0, 11 # print character
li $a0, 120 # x
syscall
bnez $t1, print # if (!t1) goto print
li $v0, 11 # print character
li $a0, 48 # 0
syscall
j end # goto end
print:
beqz $t1, end # if (!t1) goto end
andi $t2, $t1, 0xf # t2 = t1 & 0xf
sra $t1, $t1, 4 # t1 >>= 4
addi $a0, $t2, 48 # a0 = chr(t2), sort of
ble $t2, $t9, put # if (t2 <= 9) goto put
addi $a0, $a0, 7 # a0 += 7
put:
li $v0, 11 # print character at a0
syscall
j print # goto print
end:
li $v0, 11 # print character
li $a0, 10 # newline
syscall
li $v0, 10 # terminate
syscall