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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
; XFAIL: *
; RUN: opt < %s -passes=newgvn -S | FileCheck %s
%struct.A = type { ptr }
@_ZTV1A = available_externally unnamed_addr constant [4 x ptr] [ptr null, ptr @_ZTI1A, ptr @_ZN1A3fooEv, ptr @_ZN1A3barEv], align 8
@_ZTI1A = external constant ptr
; Checks if indirect calls can be replaced with direct
; assuming that %vtable == @_ZTV1A (with alignment).
; Checking const propagation across other BBs
; CHECK-LABEL: define void @_Z1gb(
define void @_Z1gb(i1 zeroext %p) {
entry:
%call = tail call noalias ptr @_Znwm(i64 8) #4
tail call void @_ZN1AC1Ev(ptr %call) #1
%vtable = load ptr, ptr %call, align 8
%cmp.vtables = icmp eq ptr %vtable, getelementptr inbounds ([4 x ptr], ptr @_ZTV1A, i64 0, i64 2)
tail call void @llvm.assume(i1 %cmp.vtables)
br i1 %p, label %if.then, label %if.else
if.then: ; preds = %entry
%0 = load ptr, ptr %vtable, align 8
; CHECK: call i32 @_ZN1A3fooEv(
%call2 = tail call i32 %0(ptr %call) #1
br label %if.end
if.else: ; preds = %entry
%vfn47 = getelementptr inbounds ptr, ptr %vtable, i64 1
; CHECK: call i32 @_ZN1A3barEv(
%1 = load ptr, ptr %vfn47, align 8
%call5 = tail call i32 %1(ptr %call) #1
br label %if.end
if.end: ; preds = %if.else, %if.then
ret void
}
; Check integration with invariant.group handling
; CHECK-LABEL: define void @invariantGroupHandling(i1 zeroext %p) {
define void @invariantGroupHandling(i1 zeroext %p) {
entry:
%call = tail call noalias ptr @_Znwm(i64 8) #4
tail call void @_ZN1AC1Ev(ptr %call) #1
%vtable = load ptr, ptr %call, align 8, !invariant.group !0
%cmp.vtables = icmp eq ptr %vtable, getelementptr inbounds ([4 x ptr], ptr @_ZTV1A, i64 0, i64 2)
tail call void @llvm.assume(i1 %cmp.vtables)
br i1 %p, label %if.then, label %if.else
if.then: ; preds = %entry
%0 = load ptr, ptr %vtable, align 8
; CHECK: call i32 @_ZN1A3fooEv(
%call2 = tail call i32 %0(ptr %call) #1
%vtable1 = load ptr, ptr %call, align 8, !invariant.group !0
%call1 = load ptr, ptr %vtable1, align 8
; CHECK: call i32 @_ZN1A3fooEv(
%callx = tail call i32 %call1(ptr %call) #1
%vtable2 = load ptr, ptr %call, align 8, !invariant.group !0
%call4 = load ptr, ptr %vtable2, align 8
; CHECK: call i32 @_ZN1A3fooEv(
%cally = tail call i32 %call4(ptr %call) #1
%vtable3 = load ptr, ptr %call, align 8, !invariant.group !0
%vfun = load ptr, ptr %vtable3, align 8
; CHECK: call i32 @_ZN1A3fooEv(
%unknown = tail call i32 %vfun(ptr %call) #1
br label %if.end
if.else: ; preds = %entry
%vfn47 = getelementptr inbounds ptr, ptr %vtable, i64 1
; CHECK: call i32 @_ZN1A3barEv(
%1 = load ptr, ptr %vfn47, align 8
%call5 = tail call i32 %1(ptr %call) #1
br label %if.end
if.end: ; preds = %if.else, %if.then
ret void
}
; Checking const propagation in the same BB
; CHECK-LABEL: define i32 @main()
define i32 @main() {
entry:
%call = tail call noalias ptr @_Znwm(i64 8)
tail call void @_ZN1AC1Ev(ptr %call)
%vtable = load ptr, ptr %call, align 8
%cmp.vtables = icmp eq ptr %vtable, getelementptr inbounds ([4 x ptr], ptr @_ZTV1A, i64 0, i64 2)
tail call void @llvm.assume(i1 %cmp.vtables)
; CHECK: call i32 @_ZN1A3fooEv(
%0 = load ptr, ptr %vtable, align 8
%call2 = tail call i32 %0(ptr %call)
ret i32 0
}
; This tests checks const propatation with fcmp instruction.
; CHECK-LABEL: define float @_Z1gf(float %p)
define float @_Z1gf(float %p) {
entry:
%p.addr = alloca float, align 4
%f = alloca float, align 4
store float %p, ptr %p.addr, align 4
store float 3.000000e+00, ptr %f, align 4
%0 = load float, ptr %p.addr, align 4
%1 = load float, ptr %f, align 4
%cmp = fcmp oeq float %1, %0 ; note const on lhs
call void @llvm.assume(i1 %cmp)
; CHECK: ret float 3.000000e+00
ret float %0
}
; CHECK-LABEL: define float @_Z1hf(float %p)
define float @_Z1hf(float %p) {
entry:
%p.addr = alloca float, align 4
store float %p, ptr %p.addr, align 4
%0 = load float, ptr %p.addr, align 4
%cmp = fcmp nnan ueq float %0, 3.000000e+00
call void @llvm.assume(i1 %cmp)
; CHECK: ret float 3.000000e+00
ret float %0
}
declare noalias ptr @_Znwm(i64)
declare void @_ZN1AC1Ev(ptr)
declare void @llvm.assume(i1)
declare i32 @_ZN1A3fooEv(ptr)
declare i32 @_ZN1A3barEv(ptr)
!0 = !{!"struct A"}
|
