undef-resolve.ll
5.94 KB
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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
; RUN: opt -sccp -S < %s | FileCheck %s
; PR6940
define double @test1() {
%t = sitofp i32 undef to double
ret double %t
; CHECK-LABEL: @test1(
; CHECK: ret double 0.0
}
; rdar://7832370
; Check that lots of stuff doesn't get turned into undef.
define i32 @test2() nounwind readnone ssp {
; CHECK-LABEL: @test2(
init:
br label %control.outer.outer
control.outer.loopexit.us-lcssa: ; preds = %control
br label %control.outer.loopexit
control.outer.loopexit: ; preds = %control.outer.loopexit.us-lcssa.us, %control.outer.loopexit.us-lcssa
br label %control.outer.outer.backedge
control.outer.outer: ; preds = %control.outer.outer.backedge, %init
%switchCond.0.ph.ph = phi i32 [ 2, %init ], [ 3, %control.outer.outer.backedge ] ; <i32> [#uses=2]
%i.0.ph.ph = phi i32 [ undef, %init ], [ %i.0.ph.ph.be, %control.outer.outer.backedge ] ; <i32> [#uses=1]
%tmp4 = icmp eq i32 %i.0.ph.ph, 0 ; <i1> [#uses=1]
br i1 %tmp4, label %control.outer.outer.split.us, label %control.outer.outer.control.outer.outer.split_crit_edge
control.outer.outer.control.outer.outer.split_crit_edge: ; preds = %control.outer.outer
br label %control.outer
control.outer.outer.split.us: ; preds = %control.outer.outer
br label %control.outer.us
control.outer.us: ; preds = %bb3.us, %control.outer.outer.split.us
%A.0.ph.us = phi i32 [ %switchCond.0.us, %bb3.us ], [ 4, %control.outer.outer.split.us ] ; <i32> [#uses=2]
%switchCond.0.ph.us = phi i32 [ %A.0.ph.us, %bb3.us ], [ %switchCond.0.ph.ph, %control.outer.outer.split.us ] ; <i32> [#uses=1]
br label %control.us
bb3.us: ; preds = %control.us
br label %control.outer.us
bb0.us: ; preds = %control.us
br label %control.us
; CHECK: control.us: ; preds = %bb0.us, %control.outer.us
; CHECK-NEXT: %switchCond.0.us = phi i32
; CHECK-NEXT: switch i32 %switchCond.0.us
control.us: ; preds = %bb0.us, %control.outer.us
%switchCond.0.us = phi i32 [ %A.0.ph.us, %bb0.us ], [ %switchCond.0.ph.us, %control.outer.us ] ; <i32> [#uses=2]
switch i32 %switchCond.0.us, label %control.outer.loopexit.us-lcssa.us [
i32 0, label %bb0.us
i32 1, label %bb1.us-lcssa.us
i32 3, label %bb3.us
i32 4, label %bb4.us-lcssa.us
]
control.outer.loopexit.us-lcssa.us: ; preds = %control.us
br label %control.outer.loopexit
bb1.us-lcssa.us: ; preds = %control.us
br label %bb1
bb4.us-lcssa.us: ; preds = %control.us
br label %bb4
control.outer: ; preds = %bb3, %control.outer.outer.control.outer.outer.split_crit_edge
%A.0.ph = phi i32 [ %nextId17, %bb3 ], [ 4, %control.outer.outer.control.outer.outer.split_crit_edge ] ; <i32> [#uses=1]
%switchCond.0.ph = phi i32 [ 0, %bb3 ], [ %switchCond.0.ph.ph, %control.outer.outer.control.outer.outer.split_crit_edge ] ; <i32> [#uses=1]
br label %control
control: ; preds = %bb0, %control.outer
%switchCond.0 = phi i32 [ %A.0.ph, %bb0 ], [ %switchCond.0.ph, %control.outer ] ; <i32> [#uses=2]
switch i32 %switchCond.0, label %control.outer.loopexit.us-lcssa [
i32 0, label %bb0
i32 1, label %bb1.us-lcssa
i32 3, label %bb3
i32 4, label %bb4.us-lcssa
]
bb4.us-lcssa: ; preds = %control
br label %bb4
bb4: ; preds = %bb4.us-lcssa, %bb4.us-lcssa.us
br label %control.outer.outer.backedge
control.outer.outer.backedge: ; preds = %bb4, %control.outer.loopexit
%i.0.ph.ph.be = phi i32 [ 1, %bb4 ], [ 0, %control.outer.loopexit ] ; <i32> [#uses=1]
br label %control.outer.outer
bb3: ; preds = %control
%nextId17 = add i32 %switchCond.0, -2 ; <i32> [#uses=1]
br label %control.outer
bb0: ; preds = %control
br label %control
bb1.us-lcssa: ; preds = %control
br label %bb1
bb1: ; preds = %bb1.us-lcssa, %bb1.us-lcssa.us
ret i32 0
}
; Make sure SCCP honors the xor "idiom"
; rdar://9956541
define i32 @test3() {
%t = xor i32 undef, undef
ret i32 %t
; CHECK-LABEL: @test3(
; CHECK: ret i32 0
}
; Be conservative with FP ops
define double @test4(double %x) {
%t = fadd double %x, undef
ret double %t
; CHECK-LABEL: @test4(
; CHECK: fadd double %x, undef
}
; Make sure casts produce a possible value
define i32 @test5() {
%t = sext i8 undef to i32
ret i32 %t
; CHECK-LABEL: @test5(
; CHECK: ret i32 0
}
; Make sure ashr produces a possible value
define i32 @test6() {
%t = ashr i32 undef, 31
ret i32 %t
; CHECK-LABEL: @test6(
; CHECK: ret i32 0
}
; Make sure lshr produces a possible value
define i32 @test7() {
%t = lshr i32 undef, 31
ret i32 %t
; CHECK-LABEL: @test7(
; CHECK: ret i32 0
}
; icmp eq with undef simplifies to undef
define i1 @test8() {
%t = icmp eq i32 undef, -1
ret i1 %t
; CHECK-LABEL: @test8(
; CHECK: ret i1 undef
}
; Make sure we don't conclude that relational comparisons simplify to undef
define i1 @test9() {
%t = icmp ugt i32 undef, -1
ret i1 %t
; CHECK-LABEL: @test9(
; CHECK: icmp ugt
}
; Make sure we handle extractvalue
define i64 @test10() {
entry:
%e = extractvalue { i64, i64 } undef, 1
ret i64 %e
; CHECK-LABEL: @test10(
; CHECK: ret i64 undef
}
@GV = external global i32
define i32 @test11(i1 %tobool) {
entry:
%shr4 = ashr i32 undef, zext (i1 icmp eq (i32* bitcast (i32 (i1)* @test11 to i32*), i32* @GV) to i32)
ret i32 %shr4
; CHECK-LABEL: @test11(
; CHECK: ret i32 0
}
; Test unary ops
define double @test12(double %x) {
%t = fneg double undef
ret double %t
; CHECK-LABEL: @test12(
; CHECK: double undef
}