gcc-4.9/gcc/testsuite/gcc.dg/pr44404.c


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/* PR rtl-optimization/44404
   foo() used to be miscompiled on ARM due to a bug in auto-inc-dec.c,
   which resulted in "strb r1, [r1], #-36".  */

/* { dg-do run } */
/* { dg-options "-O2 -fno-unroll-loops" } */

extern char *strcpy (char *, const char *);
extern int strcmp (const char*, const char*);
extern void abort (void);

char buf[128];

void __attribute__((noinline))
bar (int a, const char *p)
{
  if (strcmp (p, "0123456789abcdefghijklmnopqrstuvwxyz") != 0)
    abort ();
}

void __attribute__((noinline))
foo (int a)
{
  if (a)
    bar (0, buf);
  strcpy (buf, "0123456789abcdefghijklmnopqrstuvwxyz");
  bar (0, buf);
}

int
main (void)
{
  foo (0);
  return 0;
}