gcc/testsuite/gcc.dg/torture/pr65077.c

   1 /* { dg-do run } */
   2
   3 extern void abort (void);
   4 extern void *memcpy(void *, const void *, __SIZE_TYPE__);
   5
   6 typedef struct {
   7     void *v1;
   8     void *v2;
   9     void *v3;
  10     union {
  11         void *f1;
  12         void *f2;
  13     } u;
  14 } S;
  15
  16
  17 S *getS();
  18 void verify_p(void *p);
  19 double *getP(void *p);
  20
  21 void memcpy_bug()
  22 {
  23   S *s;
  24   double *p = getP(0);
  25
  26   if (p) {
  27       int intSptr[sizeof(S*)/sizeof(int)];
  28       unsigned i = 0;
  29       for (i = 0; i < sizeof(intSptr)/sizeof(*intSptr); ++i) {
  30           intSptr[i] = (int) p[i];
  31       }
  32       memcpy(&s, intSptr, sizeof(intSptr));
  33       (s)->u.f1 = p;
  34       verify_p((s)->u.f1);
  35   } else {
  36       s = getS();
  37   }
  38   verify_p(s->u.f1);
  39 }
  40
  41 double P[4];
  42
  43 double *getP(void *p) {
  44     union u {
  45         void *p;
  46         int i[2];
  47     } u;
  48     u.p = P;
  49     P[0] = u.i[0];
  50     P[1] = u.i[1];
  51     return P;
  52 }
  53
  54 S *getS()
  55 {
  56   return 0;
  57 }
  58
  59 void verify_p(void *p)
  60 {
  61   if (p != P)
  62     abort ();
  63 }
  64
  65 int main(int argc, char *argv[])
  66 {
  67     memcpy_bug();
  68     return 0;
  69 }
  70