1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-vrp1" } */
extern void vrp_keep (void);
void
f2 (int c, int b)
{
int s = 0;
if (c == 0)
s += 1;
else if (c < 1)
s -= 1;
/* s in [-1, 1]. */
b = (b & 1) + 1;
/* b in range [1, 2]. */
b = s << b;
/* b in range [-4, 4]. */
if (b == -4)
vrp_keep ();
if (b == 4)
vrp_keep ();
}
void
f3 (int s, int b)
{
if (s >> 3 == -2)
{
/* s in range [-16, -9]. */
b = (b & 1) + 1;
/* b in range [1, 2]. */
b = s << b;
/* b in range [bmin << smax, bmax << smin],
== [-16 << 2, -9 << 1]
== [-64, -18]. */
if (b == -64)
vrp_keep ();
if (b == -18)
vrp_keep ();
}
}
void
f4 (unsigned int s, unsigned int b)
{
s |= ~(0xffU);
/* s in [0xffffff00, 0xffffffff]. */
b = (b & 1) + 1;
/* b in [1, 2]. */
b = s << b;
/* s in [0xfffffc00, 0xfffffffe]. */
if (b == ~0x3ffU)
vrp_keep ();
if (b == ~0x1U)
vrp_keep ();
}
/* { dg-final { scan-tree-dump-times "vrp_keep \\(" 6 "vrp1"} } */
|
