gcc/testsuite/gcc.dg/pr44404.c

   1 /* PR rtl-optimization/44404
   2    foo() used to be miscompiled on ARM due to a bug in auto-inc-dec.c,
   3    which resulted in "strb r1, [r1], #-36".  */
   4
   5 /* { dg-do run } */
   6 /* { dg-options "-O2 -fno-unroll-loops" } */
   7
   8 extern char *strcpy (char *, const char *);
   9 extern int strcmp (const char*, const char*);
  10 extern void abort (void);
  11
  12 char buf[128];
  13
  14 void __attribute__((noinline))
  15 bar (int a, const char *p)
  16 {
  17   if (strcmp (p, "0123456789abcdefghijklmnopqrstuvwxyz") != 0)
  18     abort ();
  19 }
  20
  21 void __attribute__((noinline))
  22 foo (int a)
  23 {
  24   if (a)
  25     bar (0, buf);
  26   strcpy (buf, "0123456789abcdefghijklmnopqrstuvwxyz");
  27   bar (0, buf);
  28 }
  29
  30 int
  31 main (void)
  32 {
  33   foo (0);
  34   return 0;
  35 }