1 /* { dg-do compile } */
2 /* { dg-options "-O2 -fisolate-erroneous-paths-attribute -fdump-tree-isolate-paths -fdump-tree-phicprop1" } */
3
4
5 int z;
6 int y;
7
8 int * foo(int a) __attribute__((returns_nonnull));
9 int * bar(void) __attribute__((returns_nonnull));
10
11 int *
foo(int a)12 foo(int a)
13
14 {
15 switch (a)
16 {
17 case 0:
18 return &z;
19 default:
20 return (int *)0;
21 }
22 }
23
24
25 int *
bar(void)26 bar (void)
27 {
28 return 0;
29 }
30
31 /* We testing that the path isolation code can take advantage of the
32 returns non-null attribute to isolate a path where NULL flows into
33 a return statement. We test this twice, once where the NULL flows
34 from a PHI, the second with an explicit return 0 in the IL.
35
36 We also verify that after isolation phi-cprop simplifies the
37 return statement so that it returns &z directly.
38 /* { dg-final { scan-tree-dump-times "__builtin_trap" 2 "isolate-paths"} } */
39 /* { dg-final { scan-tree-dump-times "return &z;" 1 "phicprop1"} } */
40 /* { dg-final { cleanup-tree-dump "isolate-paths" } } */
41 /* { dg-final { cleanup-tree-dump "phicprop1" } } */
42
43
44