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Date: Thu, 02 Jan 2003 21:21:00 -0000
To: gcc-bugs@gcc.gnu.org
From: Songtao Chen <songtao@cisco.com>
Subject: Is this a bug?
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Hi there,

It appears to be a bug to me.

* gcc version:
   gcc.c2.95.3

* source code: bug.c

#include<stdio.h>

int main(void)
{
    int r, i;

    i = 0;
    r = ++i % 2;
    printf("test 1 : r = %d, i = %d\n", r, i);

    i = 0;
    r = i++ % 2;
    printf("test 2 : r = %d, i = %d\n", r, i);

    i = 0;
    r = (++i) % 2;
    printf("test 3 : r = %d, i = %d\n", r, i);

    i = 0;
    r = (i++) % 2;
    printf("test 4 : r = %d, i = %d\n", r, i);

    i = 0;
    r = (i+1) % 2;
    printf("test 5 : r = %d, i = %d\n", r, i);

    return 0;
}

* compile command:
    gcc.c2.95.3 bug.c

* type of machine:

   SunOS ott-view1 5.6 Generic_105181-28 sun4u sparc SUNW,Ultra-Enterprise

...


* output :

test 1 : r = 1, i = 1
test 2 : r = 0, i = 1
test 3 : r = 1, i = 1
test 4 : r = 0, i = 1
test 5 : r = 1, i = 0

     Expecting r = 1 in test 4, because use of brackets.



Thanks,

Songtao