blob: a87fb1c424b6445431e131e8dfb3e2cd3fd282f7 (
plain)
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
|
/* { dg-do run } */
/* { dg-require-alias "" } */
/* { dg-options "-O -fdump-tree-fre1" } */
extern void abort (void);
struct X { int a[128]; };
static const struct X a = { 0, 1, 2, 3 };
/* Prevent gimplify_modify_expr_rhs / gimplify_init_constructor from
expanding the aggregate copy below inline. */
static const struct X A __attribute__((alias("a")));
struct X *q;
int __attribute__((noinline))
foo ()
{
struct X b = A;
int *p = &b.a[2];
/* Prevent SRA from decomposing b. */
q = &b;
return *p;
}
int main()
{
if (foo() != 2)
abort ();
return 0;
}
/* Verify the aggregate copy we want to look through is still in place. */
/* { dg-final { scan-tree-dump "b = A;" "fre1" } } */
/* Verify we have propagated the element read all the way to the return. */
/* { dg-final { scan-tree-dump "return 2" "fre1" } } */
|
