函数写没返回值，出现的异常。

#include<stdio.h>

int bitcount(unsigned x)
{
    int i=0;

    while(x&=(x-1))
    {
        i++;    
    }    
}

main ()
{
    int i=0;

    i=bitcount(45);
    printf("i=%d\n",i);
}

 

    .file    "p2-9.c"
    .text
.globl bitcount
    .type    bitcount, @function
bitcount:
    pushl    %ebp
    movl    %esp, %ebp
    subl    $16, %esp
    movl    $0, -4(%ebp)
    jmp    .L2
.L3:
    addl    $1, -4(%ebp)
.L2:
    movl    8(%ebp), %eax
    subl    $1, %eax
    andl    %eax, 8(%ebp)
    cmpl    $0, 8(%ebp)
    jne    .L3
    leave
    ret
    .size    bitcount, .-bitcount
    .section    .rodata
.LC0:
    .string    "i=%d\n"
    .text
.globl main
    .type    main, @function
main:
    pushl    %ebp
    movl    %esp, %ebp
    andl    $-16, %esp
    subl    $32, %esp
    movl    $0, 28(%esp)
    movl    $45, (%esp)
    call    bitcount
    movl    %eax, 28(%esp)
    movl    $.LC0, %eax
    movl    28(%esp), %edx
    movl    %edx, 4(%esp)
    movl    %eax, (%esp)
    call    printf
    leave
    ret
    .size    main, .-main
    .ident    "GCC: (Ubuntu 4.4.1-4ubuntu8) 4.4.1"
    .section    .note.GNU-stack,"",@progbits