gcc/testsuite/gcc.target/i386/pr57046.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2" } */
   3
   4 struct emac {
   5         unsigned reg[23];
   6 };
   7
   8 struct mop {
   9         unsigned long long addr;
  10         unsigned int size;
  11 };
  12
  13 unsigned int __attribute__((__noinline__))
  14 level(const struct emac *obj)
  15 {
  16         return 0;
  17 }
  18
  19 void __attribute__((__noinline__))
  20 info(struct emac *dev, unsigned long long addr)
  21 {
  22         asm("" : : : "memory");
  23 }
  24
  25 unsigned long long __attribute__((__noinline__))
  26 get_value(const struct mop *mop)
  27 {
  28         return 0x1234567890abcdefull;
  29 }
  30
  31 int __attribute__((__noinline__))
  32 emac_operation(struct emac *obj, struct mop *mop)
  33 {
  34         unsigned long long addr = mop->addr;
  35         int index = addr >> 2;
  36         unsigned int value, old_value;
  37
  38         if (mop->size != 4)
  39                 return 0;
  40
  41         if (index >= 23) {
  42                 if (level(obj) >= 1)
  43                         info(obj, addr);
  44                 return 0;
  45         }
  46
  47         value = get_value(mop);
  48         old_value = obj->reg[index];
  49
  50         info(obj, 0);
  51
  52         switch (index) {
  53         case 0:
  54                 obj->reg[0] = old_value;
  55                 break;
  56         case 7:
  57         case 8:
  58                 obj->reg[index] = value;
  59                 break;
  60         }
  61
  62         return 0;
  63 }
  64
  65 int main(void)
  66 {
  67         struct emac e = { { 0 } };
  68         struct mop mop = { 32, 4 };
  69
  70         e.reg[8] = 0xdeadbeef;
  71         emac_operation(&e, &mop);
  72
  73         if (e.reg[8] != 0x90abcdef)
  74            __builtin_abort();
  75
  76            return 0;
  77 }