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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility %s | FileCheck %s
target datalayout = "e-p:64:64"
target triple = "x86_64-unknown-linux-gnu"
@vt1 = constant [2 x ptr] [ptr @vf1a, ptr @vf1b], !type !0
@vt2 = constant [2 x ptr] [ptr @vf2a, ptr @vf2b], !type !0
@sink = external global i32
define i32 @vf1a(ptr %this, i32 %arg) {
store i32 %arg, ptr @sink
ret i32 %arg
}
define i32 @vf2a(ptr %this, i32 %arg) {
store i32 %arg, ptr @sink
ret i32 %arg
}
define i32 @vf1b(ptr %this, i32 %arg) {
ret i32 %arg
}
define i32 @vf2b(ptr %this, i32 %arg) {
ret i32 %arg
}
; Test that we don't apply VCP if the virtual function body accesses memory,
; even if the function returns a constant.
; CHECK: define i32 @call1
define i32 @call1(ptr %obj) {
%vtable = load ptr, ptr %obj
%p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid")
call void @llvm.assume(i1 %p)
%fptr = load ptr, ptr %vtable
; CHECK: call i32 %
%result = call i32 %fptr(ptr %obj, i32 1)
ret i32 %result
}
; Test that we can apply VCP regardless of the function attributes by analyzing
; the function body itself.
; CHECK: define i32 @call2
define i32 @call2(ptr %obj) {
%vtable = load ptr, ptr %obj
%p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid")
call void @llvm.assume(i1 %p)
%fptrptr = getelementptr [1 x ptr], ptr %vtable, i32 0, i32 1
%fptr = load ptr, ptr %fptrptr
%result = call i32 %fptr(ptr %obj, i32 1)
; CHECK: ret i32 1
ret i32 %result
}
declare i1 @llvm.type.test(ptr, metadata)
declare void @llvm.assume(i1)
!0 = !{i32 0, !"typeid"}
|
