Viewing file:  pr57046.c (1.38 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O2" } */
struct emac {
unsigned reg[23];
};
struct mop {
unsigned long long addr;
unsigned int size;
};
unsigned int __attribute__((__noinline__))
level(const struct emac *obj)
{
return 0;
}
void __attribute__((__noinline__))
info(struct emac *dev, unsigned long long addr)
{
asm("" : : : "memory");
}
unsigned long long __attribute__((__noinline__))
get_value(const struct mop *mop)
{
return 0x1234567890abcdefull;
}
int __attribute__((__noinline__))
emac_operation(struct emac *obj, struct mop *mop)
{
unsigned long long addr = mop->addr;
int index = addr >> 2;
unsigned int value, old_value;
if (mop->size != 4)
return 0;
if (index >= 23) {
if (level(obj) >= 1)
info(obj, addr);
return 0;
}
value = get_value(mop);
old_value = obj->reg[index];
info(obj, 0);
switch (index) {
case 0:
obj->reg[0] = old_value;
break;
case 7:
case 8:
obj->reg[index] = value;
break;
}
return 0;
}
int main(void)
{
struct emac e = { { 0 } };
struct mop mop = { 32, 4 };
e.reg[8] = 0xdeadbeef;
emac_operation(&e, &mop);
if (e.reg[8] != 0x90abcdef)
__builtin_abort();
return 0;
}
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