# Test for clz

.org 0
# Provide program starting address to linker
.global _start

.extern clz
.extern tohex

/* newlib system calls */
.set SYSEXIT,  93
.set SYSWRITE, 64

.section .rodata

inputs:
    .word 0
    .word 1
    .word 2
    .word 3
    .word 0xF
    .word 0xFF
    .word 0xFFF
    .word 0xFFFF
    .word 0xFFFFF
    .word 0xFFFFFF
    .word 0xFFFFFFF
    .word 0xFFFFFFFF
    .word 0x80000000
    .word 0x00008000
inputs_end:

.section .bss

buf: .skip 9

.text

_start:
    li a0, '\n'
    la a1, buf
    sb a0, 8(a1)        # append newline to buf

    la s0, inputs       # init loop variables
    la s1, inputs_end
loop:
    lw a0, 0(s0)        # input value
    jal clz
    la a1, buf
    jal tohex

    li t0, SYSWRITE     # "write" syscall
    li a0, 1            # 1 = standard output (stdout)
    la a1, buf          # load address of output string
    li a2, 9            # length of output string
    ecall               # invoke syscall to print the string

    addi s0, s0, 4      # increment input pointer to the next input
    bltu s0, s1, loop   # if the input address is less than inputs_end, loop

    li t0, SYSEXIT      # "exit" syscall
    la a0, 0            # Use 0 return code
    ecall               # invoke syscall to terminate the program