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/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-evrp" } */
extern void good (void);
extern void bad (void);
/* Switch simplification should remove 'case 2:' because 'i' will always
* have its 0th bit set (odd). */
void bitmask_elimination_1(int i)
{
i = i | 1;
switch (i)
{
case 1:
good ();
break;
// This case should be removed;
case 2:
bad ();
break;
case 3:
good ();
break;
default:
break;
}
}
/* Switch simplification should remove 'case 20-28:' because 'i' will always
* be a multiple of 16. */
void bitmask_elimination_2 (int i)
{
int masked_val = i & 0xF0; // This zeroes out the lower 4 bits of 'i'
switch (masked_val)
{
case 0:
good (); // Reachable.
break;
// This entire cased should be removed;
case 20 ... 28:
bad ();
break;
case 32:
good (); // Reachable.
break;
default:
good ();
break;
}
}
/* { dg-final { scan-tree-dump-not "bad" "evrp" } } */
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