gcc/testsuite/gcc.dg/20020219-1.c

   1 /* PR c/4389
   2    This testcase failed because host_integerp (x, 0) was returning
   3    1 even for constants bigger than 2^31.  It fails under under hppa
   4    hpux without -mdisable-indexing because the pointer x - 1 is used
   5    as the base address of an indexed load.  Because the struct A is not
   6    actually allocated, x - 1 lies in the text segment and this causes
   7    the wrong space register to be selected for the load.  It fails on
   8    IA64 hpux in ILP32 mode because extending x - 1 before adding the
   9    array offset gives a different answer then adding first and then
  10    extending.  The underlying problem is the same as with hppa, x - 1 is
  11    not a legal data address.  */
  12 /* { dg-do run } */
  13 /* { dg-options "-O2" } */
  14 /* { dg-options "-O2 -mdisable-indexing" { target hppa*-*-hpux* } } */
  15 /* { dg-skip-if "" { "ia64-*-hpux*" } "*" "-mlp64" } */
  16
  17 /* Disable the test entirely for 16-bit targets.  */
  18 #if __INT_MAX__ > 32767
  19
  20 extern void abort (void);
  21 extern void exit (int);
  22 struct A {
  23   int a[10000][10000];
  24 };
  25 int b[2] = { 213151, 0 };
  26
  27 void foo (struct A *x, int y)
  28 {
  29   if (x->a[9999][9999] != x->a[y][y])
  30     abort ();
  31   if (x->a[9999][9999] != 213151)
  32     abort ();
  33 }
  34
  35 int main (void)
  36 {
  37   struct A *x;
  38   asm ("" : "=r" (x) : "0" (&b[1]));
  39   foo (x - 1, 9999);
  40   exit (0);
  41 }
  42
  43 #else
  44
  45 int main () { return 0; }
  46
  47 #endif /* __INT_MAX__ */