[mips] Finish chapter 3
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# print -35 in 8-bit two-complement binary
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.text
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main:
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li $t0, -35 # t0 = -35
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li $t1, 0 # t1 = 0
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li $t8, 8 # t8 = 8
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reverse:
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beqz $t8, prefix # if (!t8) goto prefix
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andi $t2, $t0, 1 # t2 = t0 & 1
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sra $t0, $t0, 1 # t0 >>= 1
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sll $t1, $t1, 1 # t1 <<= 1
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add $t1, $t1, $t2 # t1 += t2
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addi $t8, $t8, -1 # t8--
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j reverse # goto reverse
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prefix:
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li $v0, 11 # print character
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li $a0, 48 # 0
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syscall
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li $v0, 11 # print character
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li $a0, 98 # b
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syscall
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li $t8, 8 # t8 = 8
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print:
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beqz $t8, end # if (!t8) goto end
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li $v0, 1 # print integre
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andi $a0, $t1, 1 # a0 = t1 & 1
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syscall
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sra $t1, $t1, 1 # t1 >>= 1
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addi $t8, $t8, -1 # t8--
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j print # goto print
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end:
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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@ -0,0 +1,41 @@
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# print -32 in 8-bit two-complement binary
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.text
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main:
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li $t0, -32 # t0 = -32
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li $t1, 0 # t1 = 0
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li $t8, 8 # t8 = 8
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reverse:
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beqz $t8, prefix # if (!t8) goto prefix
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andi $t2, $t0, 1 # t2 = t0 & 1
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sra $t0, $t0, 1 # t0 >>= 1
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sll $t1, $t1, 1 # t1 <<= 1
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add $t1, $t1, $t2 # t1 += t2
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addi $t8, $t8, -1 # t8--
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j reverse # goto reverse
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prefix:
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li $v0, 11 # print character
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li $a0, 48 # 0
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syscall
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li $v0, 11 # print character
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li $a0, 98 # b
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syscall
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li $t8, 8 # t8 = 8
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print:
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beqz $t8, end # if (!t8) goto end
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li $v0, 1 # print integre
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andi $a0, $t1, 1 # a0 = t1 & 1
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syscall
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sra $t1, $t1, 1 # t1 >>= 1
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addi $t8, $t8, -1 # t8--
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j print # goto print
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end:
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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# print(int('204', 8))
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.text
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main:
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li $t0, 0 # t0 = 0
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addi $t0, $t0, 2 # t0 += 2
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sll $t0, $t0, 6 # t0 *= 8 * 8
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addi $t0, $t0, 4 # t0 += 4
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li $v0, 1 # print integer
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move $a0, $t0 # at t0
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syscall
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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# print(int('204', 7))
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.text
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main:
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li $t0, 0 # t0 = 0
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addi $t0, $t0, 2 # t0 += 2
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li $t1, 49 # t1 = 7 * 7
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mul $t0, $t0, $t1 # t0 *= t1
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addi $t0, $t0, 4 # t0 += 4
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li $v0, 1 # print integer
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move $a0, $t0 # at t0
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syscall
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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# print(int('204', 6))
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.text
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main:
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li $t0, 0 # t0 = 0
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addi $t0, $t0, 2 # t0 += 2
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li $t1, 36 # t1 = 6 * 6
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mul $t0, $t0, $t1 # t0 *= t1
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addi $t0, $t0, 4 # t0 += 4
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li $v0, 1 # print integer
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move $a0, $t0 # at t0
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syscall
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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@ -0,0 +1,19 @@
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# print(int('204', 5))
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.text
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main:
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li $t0, 0 # t0 = 0
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addi $t0, $t0, 2 # t0 += 2
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li $t1, 25 # t1 = 5 * 5
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mul $t0, $t0, $t1 # t0 *= t1
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addi $t0, $t0, 4 # t0 += 4
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li $v0, 1 # print integer
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move $a0, $t0 # at t0
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syscall
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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@ -0,0 +1,20 @@
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# t0 = 0b10101, using only bit shift and add
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.text
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main:
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li $t0, 0 # t0 = 0
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addi $t0, $t0, 1 # t0++
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sll $t0, $t0, 2 # t0 <<= 2
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addi $t0, $t0, 1 # t0++
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sll $t0, $t0, 2 # t0 <<= 2
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addi $t0, $t0, 1 # t0++
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li $v0, 1 # print integer
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move $a0, $t0 # at t0
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syscall
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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# t0 = 0b11001, using only bit shift and add
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.text
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main:
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li $t0, 0 # t0 = 0
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addi $t0, $t0, 1 # t0++
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sll $t0, $t0, 1 # t0 <<= 1
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addi $t0, $t0, 1 # t0++
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sll $t0, $t0, 3 # t0 <<= 3
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addi $t0, $t0, 1 # t0++
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li $v0, 1 # print integer
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move $a0, $t0 # at t0
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syscall
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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# print(hex(0b10101))
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.text
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main:
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li $t0, 21 # t0 = 0b10101
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li $t1, 0 # t1 = 0
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li $t9, 9 # t9 = 9
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reverse:
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beqz $t0, done # if (!t0) goto done
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andi $t2, $t0, 0xf # t2 = t0 & 0xf
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sra $t0, $t0, 4 # t0 >>= 4
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sll $t1, $t1, 4 # t1 <<= 4
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add $t1, $t1, $t2 # t1 += t2
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j reverse # goto reverse
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done:
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li $v0, 11 # print character
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li $a0, 48 # 0
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syscall
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li $v0, 11 # print character
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li $a0, 120 # x
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syscall
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bnez $t1, print # if (!t1) goto print
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li $v0, 11 # print character
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li $a0, 48 # 0
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syscall
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j end # goto end
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print:
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beqz $t1, end # if (!t1) goto end
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andi $t2, $t1, 0xf # t2 = t1 & 0xf
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sra $t1, $t1, 4 # t1 >>= 4
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addi $a0, $t2, 48 # a0 = chr(t2), sort of
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ble $t2, $t9, put # if (t2 <= 9) goto put
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addi $a0, $a0, 7 # a0 += 7
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put:
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li $v0, 11 # print character at a0
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syscall
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j print # goto print
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end:
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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# print(hex(0b11001))
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.text
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main:
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li $t0, 25 # t0 = 0b11001
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li $t1, 0 # t1 = 0
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li $t9, 9 # t9 = 9
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reverse:
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beqz $t0, done # if (!t0) goto done
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andi $t2, $t0, 0xf # t2 = t0 & 0xf
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sra $t0, $t0, 4 # t0 >>= 4
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sll $t1, $t1, 4 # t1 <<= 4
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add $t1, $t1, $t2 # t1 += t2
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j reverse # goto reverse
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done:
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li $v0, 11 # print character
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li $a0, 48 # 0
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syscall
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li $v0, 11 # print character
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li $a0, 120 # x
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syscall
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bnez $t1, print # if (!t1) goto print
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li $v0, 11 # print character
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li $a0, 48 # 0
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syscall
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j end # goto end
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print:
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beqz $t1, end # if (!t1) goto end
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andi $t2, $t1, 0xf # t2 = t1 & 0xf
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sra $t1, $t1, 4 # t1 >>= 4
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addi $a0, $t2, 48 # a0 = chr(t2), sort of
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ble $t2, $t9, put # if (t2 <= 9) goto put
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addi $a0, $a0, 7 # a0 += 7
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put:
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li $v0, 11 # print character at a0
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syscall
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j print # goto print
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end:
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li $v0, 11 # print character
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li $a0, 10 # newline
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syscall
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li $v0, 10 # terminate
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syscall
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