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
|
/* PR tree-optimization/27285 */
/* PR tree-optimization/45122 */
/* { dg-do run } */
/* { dg-options "-O2 -funsafe-loop-optimizations" } */
extern void abort (void);
struct S { unsigned char a, b, c, d[16]; };
void __attribute__ ((noinline))
foo (struct S *x, struct S *y)
{
int a, b;
unsigned char c, *d, *e;
b = x->b;
d = x->d;
e = y->d;
a = 0;
while (b)
{
if (b >= 8)
{
c = 0xff;
b -= 8;
}
else
{
c = 0xff << (8 - b);
b = 0;
}
e[a] = d[a] & c;
a++;
}
}
int
main (void)
{
struct S x = { 0, 25, 0, { 0xaa, 0xbb, 0xcc, 0xdd }};
struct S y = { 0, 0, 0, { 0 }};
foo (&x, &y);
if (x.d[0] != y.d[0] || x.d[1] != y.d[1]
|| x.d[2] != y.d[2] || (x.d[3] & 0x80) != y.d[3])
abort ();
return 0;
}
|
