while-loop-code-gen-gcc.c

int main()
{
    int i = 0, n = 1;

    while (i++ < n) if (i == 1) break;
    while (i++ < n && i != 1);

    return 0;
}

        .file   "test.c"
        .text
.globl main
        .type   main, @function
main:
        pushl   %ebp
        movl    %esp, %ebp
        subl    $16, %esp
        movl    $0, -4(%ebp)
        movl    $1, -8(%ebp)
        jmp     .L2
.L4:
        cmpl    $1, -4(%ebp)
        je      .L7
.L2:
        movl    -4(%ebp), %eax
        cmpl    -8(%ebp), %eax
        setl    %al
        addl    $1, -4(%ebp)
        testb   %al, %al
        jne     .L4
        jmp     .L3
.L7:
        nop
.L3:
        movl    -4(%ebp), %eax
        cmpl    -8(%ebp), %eax
        setl    %al
        addl    $1, -4(%ebp)
        testb   %al, %al
        je      .L5
        cmpl    $1, -4(%ebp)
        jne     .L3
.L5:
        movl    $0, %eax
        leave
        ret
        .size   main, .-main
        .ident  "GCC: (Ubuntu 4.4.3-4ubuntu5) 4.4.3"
        .section        .note.GNU-stack,"",@progbits