1; RUN: opt -instcombine -S < %s | FileCheck %s
2
3@g1 = common global i32* null, align 8
4
5%struct.S1 = type { i32, float }
6%struct.S2 = type { float, i32 }
7
8; Check that instcombine preserves metadata when it merges two loads.
9;
10; CHECK: return:
11; CHECK: load i32*, i32** %{{[a-z0-9.]+}}, align 8, !nonnull ![[EMPTYNODE:[0-9]+]]
12; CHECK: load i32, i32* %{{[a-z0-9.]+}}, align 4, !tbaa ![[TBAA:[0-9]+]], !range ![[RANGE:[0-9]+]], !invariant.load ![[EMPTYNODE:[0-9]+]], !alias.scope ![[ALIAS_SCOPE:[0-9]+]], !noalias ![[NOALIAS:[0-9]+]]
13
14; Function Attrs: nounwind ssp uwtable
15define i32 @phi_load_metadata(%struct.S1* %s1, %struct.S2* %s2, i32 %c, i32** %x0, i32 **%x1) #0 {
16entry:
17  %tobool = icmp eq i32 %c, 0
18  br i1 %tobool, label %if.end, label %if.then
19
20if.then:                                          ; preds = %entry
21  %i = getelementptr inbounds %struct.S2, %struct.S2* %s2, i64 0, i32 1
22  %val = load i32, i32* %i, align 4, !tbaa !0, !alias.scope !13, !noalias !14, !invariant.load !17, !range !18
23  %p0 = load i32*, i32** %x0, align 8, !nonnull !17
24  br label %return
25
26if.end:                                           ; preds = %entry
27  %i2 = getelementptr inbounds %struct.S1, %struct.S1* %s1, i64 0, i32 0
28  %val2 = load i32, i32* %i2, align 4, !tbaa !2, !alias.scope !15, !noalias !16, !invariant.load !17, !range !19
29  %p1 = load i32*, i32** %x1, align 8, !nonnull !17
30  br label %return
31
32return:                                           ; preds = %if.end, %if.then
33  %retval = phi i32 [ %val, %if.then ], [ %val2, %if.end ]
34  %pval = phi i32* [ %p0, %if.then ], [ %p1, %if.end ]
35  store i32* %pval, i32** @g1, align 8
36  ret i32 %retval
37}
38
39; CHECK: ![[EMPTYNODE]] = !{}
40; CHECK: ![[TBAA]] = !{![[TAG1:[0-9]+]], ![[TAG1]], i64 0}
41; CHECK: ![[TAG1]] = !{!"int", !{{[0-9]+}}, i64 0}
42; CHECK: ![[RANGE]] = !{i32 10, i32 25}
43; CHECK: ![[ALIAS_SCOPE]] = !{![[SCOPE0:[0-9]+]], ![[SCOPE1:[0-9]+]], ![[SCOPE2:[0-9]+]]}
44; CHECK: ![[SCOPE0]] = distinct !{![[SCOPE0]], !{{[0-9]+}}, !"scope0"}
45; CHECK: ![[SCOPE1]] = distinct !{![[SCOPE1]], !{{[0-9]+}}, !"scope1"}
46; CHECK: ![[SCOPE2]] = distinct !{![[SCOPE2]], !{{[0-9]+}}, !"scope2"}
47; CHECK: ![[NOALIAS]] = !{![[SCOPE3:[0-9]+]]}
48; CHECK: ![[SCOPE3]] = distinct !{![[SCOPE3]], !{{[0-9]+}}, !"scope3"}
49
50!0 = !{!1, !4, i64 4}
51!1 = !{!"", !7, i64 0, !4, i64 4}
52!2 = !{!3, !4, i64 0}
53!3 = !{!"", !4, i64 0, !7, i64 4}
54!4 = !{!"int", !5, i64 0}
55!5 = !{!"omnipotent char", !6, i64 0}
56!6 = !{!"Simple C/C++ TBAA"}
57!7 = !{!"float", !5, i64 0}
58!8 = !{!8, !"some domain"}
59!9 = !{!9, !8, !"scope0"}
60!10 = !{!10, !8, !"scope1"}
61!11 = !{!11, !8, !"scope2"}
62!12 = !{!12, !8, !"scope3"}
63!13 = !{!9, !10}
64!14 = !{!11, !12}
65!15 = !{!9, !11}
66!16 = !{!10, !12}
67!17 = !{}
68!18 = !{i32 10, i32 20}
69!19 = !{i32 15, i32 25}
70