|
145
|
1 /* { dg-do compile } */
|
|
111
|
2 /* { dg-options "-O2 -fdump-ipa-devirt-details -fdump-tree-fre1-details" } */
|
|
|
3 struct A {virtual int t(void) {return 1;}};
|
|
|
4 struct B:A {B(); virtual int t(void) {return 2;}};
|
|
|
5 struct C {int a; struct B b;};
|
|
|
6 void test2(struct A *);
|
|
|
7 int
|
|
|
8 m(struct B *b)
|
|
|
9 {
|
|
|
10 struct C *c = new (C);
|
|
|
11 struct A *a = &c->b;
|
|
|
12 a->t(); // This call should be devirtualized by
|
|
|
13 // FRE because we know type from ctor call
|
|
|
14 ((struct B *)a)->B::t(); // Make devirt possible
|
|
|
15 // C++ FE won't produce inline body without this
|
|
|
16 test2(a);
|
|
|
17 return a->t(); // This call should be devirtualized speculatively because
|
|
|
18 // test2 may change the type of A by placement new.
|
|
|
19 // C++ standard is bit imprecise about this.
|
|
|
20 }
|
|
|
21 /* { dg-final { scan-tree-dump "converting indirect call to function virtual int B::t" "fre1" } } */
|
|
|
22 /* { dg-final { scan-ipa-dump "to virtual int B::t" "devirt" } } */
|
|
|
23 /* { dg-final { scan-ipa-dump "1 speculatively devirtualized" "devirt" } } */
|
|
|
24
|
