diff options
Diffstat (limited to 'mips/chapter-3/exercise-10.s')
| -rw-r--r-- | mips/chapter-3/exercise-10.s | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/mips/chapter-3/exercise-10.s b/mips/chapter-3/exercise-10.s new file mode 100644 index 0000000..f3ddeef --- /dev/null +++ b/mips/chapter-3/exercise-10.s @@ -0,0 +1,41 @@ +# 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 |