[Bug rtl-optimization/33669] [4.3 Regression] Revision 128957 miscompiles 481.wrf

["hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #6 from hjl at lucon dot org  2007-10-06 02:31 -------
A smaller testcase:

bash-3.2$ cat x.c
extern void abort (void);

typedef struct foo_t
{ 
  unsigned int blksz;
  unsigned int bf_cnt; 
} foo_t;

#define _RNDUP(x, unit)  ((((x) + (unit) - 1) / (unit)) * (unit))
#define _RNDDOWN(x, unit)  ((x) - ((x)%(unit)))

long long
foo (foo_t *const pxp,  long long offset, unsigned int extent)
{
  long long blkoffset = _RNDDOWN(offset, (long long )pxp->blksz);
  unsigned int diff = (unsigned int)(offset - blkoffset);
  unsigned int blkextent = _RNDUP(diff + extent, pxp->blksz);

  if (pxp->blksz < blkextent)
    return -1LL;

  if (pxp->bf_cnt > pxp->blksz)
    pxp->bf_cnt = pxp->blksz;

  return blkoffset;
}

int
main ()
{
  foo_t x;
  long long xx;

  x.blksz = 8192;
  x.bf_cnt = 0;
  xx = foo (&x, 0, 4096);
  if (xx != 0LL)
    abort ();
  return 0;
}
bash-3.2$ ./xgcc -B./ -m32 -O x.c
bash-3.2$ ./a.out 
Aborted
bash-3.2$ 


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33669