• mfx <markus oberhumer.com> Dec 10 2003

mfx <markus oberhumer.com> writes:

/* Digital Mars 8.39.1 (2003-12-07) bug report
  *
  *   bad code generated when optimizing (16-bit only)
  *
  * How to repeat:
  *   dmc -ml -o bug01.c
  *   bug01.exe
  *
  * Markus F.X.J. Oberhumer <markus oberhumer.com>
  *
  * vi:ts=4:et
  */

#include <stdio.h>
#include <assert.h>

static int strength_reduce_bug(int *); /* avoid inlining */

int main()
{
     /* check for the gcc 2.6.3 -fstrength-reduce bug */

     static int x[3];
     static unsigned xn = 3;
     register unsigned j;

     for (j = 0; j < xn; j++)
         x[j] = (int)j - 3;

     assert(!strength_reduce_bug(x));

     return 0;
}

static int strength_reduce_bug(int *x)
{
     return x[0] != -3 || x[1] != -2 || x[2] != -1;
}