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From: "octo.nebula at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/59755] New: BUG Increment Operator with Accessing Arrays
Date: Fri, 10 Jan 2014 11:35:00 -0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 4.8.2
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59755

            Bug ID: 59755
           Summary: BUG Increment Operator with Accessing Arrays
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: octo.nebula at gmail dot com

Guys,

The increment operator is not working right. The post ++ should increment value
of the index after the array expression. But in this case, it acts like the pre
++ version.

See code below:

#include <stdio.h>

int main()
{
    int A[2][2] = { { 5, 7}, {9, 10} };

    int m = 0, B[] = { 0, 0 };
    int C = 0, D = 0;

    C = A[m][B[m]];
    D = A[m][B[m++]];

    if  (C != D) {
      fprintf (stderr, "Error: C /= D\n");
      return 1;
    }

     return 0;
}


[sunny@localhost trash]$ gcc test.c
[sunny@localhost trash]$ ./a.out
Error: C /= D
[sunny@localhost trash]$ 


GCC version is 4.8.2