1; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility %s | FileCheck %s
2
3target datalayout = "e-p:64:64"
4target triple = "x86_64-unknown-linux-gnu"
5
6@vt1 = constant [2 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf1a to i8*), i8* bitcast (i32 (i8*, i32)* @vf1b to i8*)], !type !0
7@vt2 = constant [2 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2a to i8*), i8* bitcast (i32 (i8*, i32)* @vf2b to i8*)], !type !0
8
9@sink = external global i32
10
11define i32 @vf1a(i8* %this, i32 %arg) {
12  store i32 %arg, i32* @sink
13  ret i32 %arg
14}
15
16define i32 @vf2a(i8* %this, i32 %arg) {
17  store i32 %arg, i32* @sink
18  ret i32 %arg
19}
20
21define i32 @vf1b(i8* %this, i32 %arg) {
22  ret i32 %arg
23}
24
25define i32 @vf2b(i8* %this, i32 %arg) {
26  ret i32 %arg
27}
28
29; Test that we don't apply VCP if the virtual function body accesses memory,
30; even if the function returns a constant.
31
32; CHECK: define i32 @call1
33define i32 @call1(i8* %obj) {
34  %vtableptr = bitcast i8* %obj to [1 x i8*]**
35  %vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
36  %vtablei8 = bitcast [1 x i8*]* %vtable to i8*
37  %p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid")
38  call void @llvm.assume(i1 %p)
39  %fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
40  %fptr = load i8*, i8** %fptrptr
41  %fptr_casted = bitcast i8* %fptr to i32 (i8*, i32)*
42  ; CHECK: call i32 %
43  %result = call i32 %fptr_casted(i8* %obj, i32 1)
44  ret i32 %result
45}
46
47; Test that we can apply VCP regardless of the function attributes by analyzing
48; the function body itself.
49
50; CHECK: define i32 @call2
51define i32 @call2(i8* %obj) {
52  %vtableptr = bitcast i8* %obj to [1 x i8*]**
53  %vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
54  %vtablei8 = bitcast [1 x i8*]* %vtable to i8*
55  %p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid")
56  call void @llvm.assume(i1 %p)
57  %fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 1
58  %fptr = load i8*, i8** %fptrptr
59  %fptr_casted = bitcast i8* %fptr to i32 (i8*, i32)*
60  %result = call i32 %fptr_casted(i8* %obj, i32 1)
61  ; CHECK: ret i32 1
62  ret i32 %result
63}
64
65declare i1 @llvm.type.test(i8*, metadata)
66declare void @llvm.assume(i1)
67
68!0 = !{i32 0, !"typeid"}
69