1; RUN: opt -instcombine -instcombine-infinite-loop-threshold=3 -S < %s | FileCheck %s
2
3%struct1 = type { %struct2*, i32, i32, i32 }
4%struct2 = type { i32, i32 }
5%struct3 = type { i32, %struct4, %struct4 }
6%struct4 = type { %struct2, %struct2 }
7
8define i32 @test1(%struct1* %dm, i1 %tmp4, i64 %tmp9, i64 %tmp19) {
9bb:
10  %tmp = getelementptr inbounds %struct1, %struct1* %dm, i64 0, i32 0
11  %tmp1 = load %struct2*, %struct2** %tmp, align 8
12  br i1 %tmp4, label %bb1, label %bb2
13
14bb1:
15  %tmp10 = getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp9
16  %tmp11 = getelementptr inbounds %struct2, %struct2* %tmp10, i64 0, i32 0
17  store i32 0, i32* %tmp11, align 4
18  br label %bb3
19
20bb2:
21  %tmp20 = getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp19
22  %tmp21 = getelementptr inbounds %struct2, %struct2* %tmp20, i64 0, i32 0
23  store i32 0, i32* %tmp21, align 4
24  br label %bb3
25
26bb3:
27  %phi = phi %struct2* [ %tmp10, %bb1 ], [ %tmp20, %bb2 ]
28  %tmp24 = getelementptr inbounds %struct2, %struct2* %phi, i64 0, i32 1
29  %tmp25 = load i32, i32* %tmp24, align 4
30  ret i32 %tmp25
31
32; CHECK-LABEL: @test1(
33; CHECK: getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp9, i32 0
34; CHECK: getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp19, i32 0
35; CHECK: %[[PHI:[0-9A-Za-z]+]] = phi i64 [ %tmp9, %bb1 ], [ %tmp19, %bb2 ]
36; CHECK: getelementptr inbounds %struct2, %struct2* %tmp1, i64 %[[PHI]], i32 1
37
38}
39
40define i32 @test2(%struct1* %dm, i1 %tmp4, i64 %tmp9, i64 %tmp19) {
41bb:
42  %tmp = getelementptr inbounds %struct1, %struct1* %dm, i64 0, i32 0
43  %tmp1 = load %struct2*, %struct2** %tmp, align 8
44  %tmp10 = getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp9
45  %tmp11 = getelementptr inbounds %struct2, %struct2* %tmp10, i64 0, i32 0
46  store i32 0, i32* %tmp11, align 4
47  %tmp20 = getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp19
48  %tmp21 = getelementptr inbounds %struct2, %struct2* %tmp20, i64 0, i32 0
49  store i32 0, i32* %tmp21, align 4
50  %tmp24 = getelementptr inbounds %struct2, %struct2* %tmp10, i64 0, i32 1
51  %tmp25 = load i32, i32* %tmp24, align 4
52  ret i32 %tmp25
53
54; CHECK-LABEL: @test2(
55; CHECK: getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp9, i32 0
56; CHECK: getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp19, i32 0
57; CHECK: getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp9, i32 1
58}
59
60; Check that instcombine doesn't insert GEPs before landingpad.
61
62define i32 @test3(%struct3* %dm, i1 %tmp4, i64 %tmp9, i64 %tmp19, i64 %tmp20, i64 %tmp21) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
63bb:
64  %tmp = getelementptr inbounds %struct3, %struct3* %dm, i64 0
65  br i1 %tmp4, label %bb1, label %bb2
66
67bb1:
68  %tmp1 = getelementptr inbounds %struct3, %struct3* %tmp, i64 %tmp19, i32 1
69  %tmp11 = getelementptr inbounds %struct4, %struct4* %tmp1, i64 0, i32 0, i32 0
70  store i32 0, i32* %tmp11, align 4
71  br label %bb3
72
73bb2:
74  %tmp2 = getelementptr inbounds %struct3, %struct3* %tmp, i64 %tmp20, i32 1
75  %tmp12 = getelementptr inbounds %struct4, %struct4* %tmp2, i64 0, i32 0, i32 1
76  store i32 0, i32* %tmp12, align 4
77  br label %bb3
78
79bb3:
80  %phi = phi %struct4* [ %tmp1, %bb1 ], [ %tmp2, %bb2 ]
81  %tmp22 = invoke i32 @foo1(i32 11) to label %bb4 unwind label %bb5
82
83bb4:
84  ret i32 0
85
86bb5:
87  %tmp27 = landingpad { i8*, i32 } catch i8* bitcast (i8** @_ZTIi to i8*)
88  %tmp34 = getelementptr inbounds %struct4, %struct4* %phi, i64 %tmp21, i32 1
89  %tmp35 = getelementptr inbounds %struct2, %struct2* %tmp34, i64 0, i32 1
90  %tmp25 = load i32, i32* %tmp35, align 4
91  ret i32 %tmp25
92
93; CHECK-LABEL: @test3(
94; CHECK: bb5:
95; CHECK-NEXT: {{.*}}landingpad { i8*, i32 }
96}
97
98@_ZTIi = external constant i8*
99declare i32 @__gxx_personality_v0(...)
100declare i32 @foo1(i32)
101
102
103; Check that instcombine doesn't fold GEPs into themselves through a loop
104; back-edge.
105
106define i8* @test4(i32 %value, i8* %buffer) {
107entry:
108  %incptr = getelementptr inbounds i8, i8* %buffer, i64 1
109  %cmp = icmp ugt i32 %value, 127
110  br i1 %cmp, label %loop.header, label %exit
111
112loop.header:
113  br label %loop.body
114
115loop.body:
116  %loopptr = phi i8* [ %incptr, %loop.header ], [ %incptr2, %loop.body ]
117  %newval = phi i32 [ %value, %loop.header ], [ %shr, %loop.body ]
118  %shr = lshr i32 %newval, 7
119  %incptr2 = getelementptr inbounds i8, i8* %loopptr, i64 1
120  %cmp2 = icmp ugt i32 %shr, 127
121  br i1 %cmp2, label %loop.body, label %loop.exit
122
123loop.exit:
124  %exitptr = phi i8* [ %incptr2, %loop.body ]
125  br label %exit
126
127exit:
128  %ptr2 = phi i8* [ %exitptr, %loop.exit ], [ %incptr, %entry ]
129  %incptr3 = getelementptr inbounds i8, i8* %ptr2, i64 1
130  ret i8* %incptr3
131
132; CHECK-LABEL: @test4(
133; CHECK: loop.body:
134; CHECK: getelementptr{{.*}}i64 1
135; CHECK: exit:
136}
137
138@.str.4 = external unnamed_addr constant [100 x i8], align 1
139
140; Instcombine shouldn't add new PHI nodes while folding GEPs if that will leave
141; old PHI nodes behind as this is not clearly beneficial.
142; CHECK-LABEL: @test5(
143define void @test5(i16 *%idx, i8 **%in) #0 {
144entry:
145  %0 = load i8*, i8** %in
146  %incdec.ptr = getelementptr inbounds i8, i8* %0, i32 1
147  %1 = load i8, i8* %incdec.ptr, align 1
148  %cmp23 = icmp eq i8 %1, 54
149  br i1 %cmp23, label %while.cond, label %if.then.25
150
151if.then.25:
152  call void @g(i8* getelementptr inbounds ([100 x i8], [100 x i8]* @.str.4, i32 0, i32 0))
153  br label %while.cond
154
155while.cond:
156; CHECK-LABEL: while.cond
157; CHECK-NOT: phi i8* [ %0, %entry ], [ %Ptr, %while.body ], [ %0, %if.then.25 ]
158  %Ptr = phi i8* [ %incdec.ptr, %entry ], [ %incdec.ptr32, %while.body], [%incdec.ptr, %if.then.25 ]
159  %2 = load i8, i8* %Ptr
160  %and = and i8 %2, 64
161  %lnot = icmp eq i8 %and, 0
162  br i1 %lnot, label %while.body, label %while.cond.33
163
164while.body:
165  %incdec.ptr32 = getelementptr inbounds i8, i8* %Ptr, i32 1
166  br label %while.cond
167
168while.cond.33:
169  %incdec.ptr34 = getelementptr inbounds i8, i8* %Ptr, i32 1
170  br label %while.cond.57
171
172while.cond.57:
173  %3 = load i8, i8* %incdec.ptr34, align 1
174  %conv59 = zext i8 %3 to i32
175  %arrayidx61 = getelementptr inbounds i16, i16* %idx, i32 %conv59
176  %4 = load i16, i16* %arrayidx61, align 2
177  %and63 = and i16 %4, 2048
178  %tobool64 = icmp eq i16 %and63, 0
179  br i1 %tobool64, label %while.cond.73, label %while.cond.57
180
181while.cond.73:
182  br label %while.cond.73
183
184}
185
186declare void @g(i8*)
187