mips memset

#made by xerpi

.text
.global mips_memset
.set noreorder

mips_memset:
        move $t0, $a0       #backup ptr
        move $t1, $a1       #c8  - $t1
        move $t2, $a1       #c16 - $t2
        sll $t2, $t2, 8     #c16 = c16 << 8
        or $t2, $t2, $a1    #c16 = c16 |c8
        move $t3, $t2       #c32 = c16
        sll $t3, $t3, 16    #c32 = c32 << 16
        or $t3, $t3, $t2    #c32 = c32 | c16
_loop_memset:
        beqz $a2, _e_memset    #if(size==0) return
        nop
        bge $a2, 4, _4_memset  #if(size >= 4) goto _4_memset
        nop
        bge $a2, 2, _2_memset  #if(size >= 2) goto _2_memset
        nop
        _1_memset:
                sb $t1, ($a0)      #*ptr = c8
                addi $a0, $a0, 1   #ptr++
                j _loop_memset
                addi $a2, $a2, -1  # size--
        _2_memset:
            sh $t2, ($a0)      #*ptr = c16
                addi $a0, $a0, 2   #ptr+=2
                j _loop_memset
                addi $a2, $a2, -2  #size-=2
        _4_memset:
        sw $t3, ($a0)      #*ptr = c32
                addi $a0, $a0, 4   #ptr+=4
                j _loop_memset
                addi $a2, $a2, -4  #ptrl=4

_e_memset:
        jr $ra
        move $v0, $t0