Viewing file:  20041122-1.c (1019 B) -rw-r--r--
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/* { dg-do compile } */
/* { dg-options "-O1 -fstrict-aliasing -fdump-tree-cddce1" } */
__extension__ typedef __SIZE_TYPE__ size_t;
extern void *xmalloc (size_t) __attribute__ ((__malloc__));
struct edge_def
{
struct basic_block_def *dest;
int flags;
};
typedef struct edge_def *edge;
struct basic_block_def
{
int flags;
};
typedef struct basic_block_def *basic_block;
extern int n_basic_blocks;
extern edge frob ();
basic_block *
find_unreachable_blocks (void)
{
basic_block *tos, *worklist;
tos = worklist = xmalloc (sizeof (basic_block) * n_basic_blocks);
edge e = frob();
if (!(e->dest->flags & 4))
{
e->dest->flags |= 4;
*tos++ = e->dest;
}
return worklist;
}
/* If the aliasing code does its job properly, then we should be
able to determine that modifying e->dest->flags does not
modify e or e->dest if we can assert strict-aliasing rules.
The net result is that we only need one load of e->dest. */
/* { dg-final { scan-tree-dump-times "->dest" 1 "cddce1" } } */
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