[Bug rtl-optimization/34490] [4.3 Regression] r128833 causes miscompilation of glibc clock_gettime.c

[jakub at gcc dot gnu dot org]

------- Comment #1 from jakub at gcc dot gnu dot org  2007-12-16 09:38 -------
Simpler testcase:
/* PR rtl-optimization/34490 */

extern void abort (void);

static int x;

int
__attribute__((noinline))
bar (void)
{
  return x;
}

int
foo (void)
{
  long int b = bar ();
  if ((unsigned long) b < -4095L)
    return b;
  if (-b != 38)
    b = -2;
  return b + 1;
}

int
main (void)
{
  x = 26;
  if (foo () != 26)
    abort ();
  x = -39;
  if (foo () != -1)
    abort ();
  x = -38;
  if (foo () != -37)
    abort ();
  return 0;
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34490