1; RUN: opt < %s -licm -pass-remarks-missed=licm -o /dev/null 2>&1 | FileCheck %s
2; RUN: opt -aa-pipeline=basic-aa -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' %s -o /dev/null -pass-remarks-missed=licm 2>&1 | FileCheck %s
3target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
4
5; Without the noalias on %p, we can't optmize this and the remark should tell
6; us about it.
7
8define void @test(i32* %array, i32* %p) {
9Entry:
10  br label %Loop
11
12Loop:
13  %j = phi i32 [ 0, %Entry ], [ %Next, %Loop ]
14  %addr = getelementptr i32, i32* %array, i32 %j
15  %a = load i32, i32* %addr
16; CHECK: remark: /tmp/kk.c:2:20: failed to move load with loop-invariant address because the loop may invalidate its value
17  %b = load i32, i32* %p, !dbg !8
18  %a2 = add i32 %a, %b
19  store i32 %a2, i32* %addr
20  %Next = add i32 %j, 1
21  %cond = icmp eq i32 %Next, 0
22  br i1 %cond, label %Out, label %Loop
23
24Out:
25  ret void
26}
27
28; This illustrates why we need to check loop-invariance before issuing this
29; remark.
30
31define i32 @invalidated_load_with_non_loop_invariant_address(i32* %array, i32* %array2) {
32Entry:
33  br label %Loop
34
35Loop:
36  %j = phi i32 [ 0, %Entry ], [ %Next, %Loop ]
37
38; CHECK-NOT: /tmp/kk.c:3:20: {{.*}} loop-invariant
39  %addr = getelementptr i32, i32* %array, i32 %j
40  %a = load i32, i32* %addr, !dbg !9
41
42  %addr2 = getelementptr i32, i32* %array2, i32 %j
43  store i32 %j, i32* %addr2
44
45  %Next = add i32 %j, 1
46  %cond = icmp eq i32 %Next, 0
47  br i1 %cond, label %Out, label %Loop
48
49Out:
50  %a2 = phi i32 [ %a, %Loop ]
51  ret i32 %a2
52}
53
54!llvm.dbg.cu = !{!0}
55!llvm.module.flags = !{!3, !4}
56!llvm.ident = !{!5}
57
58!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
59!1 = !DIFile(filename: "/tmp/kk.c", directory: "/tmp")
60!2 = !{}
61!3 = !{i32 2, !"Debug Info Version", i32 3}
62!4 = !{i32 1, !"PIC Level", i32 2}
63!5 = !{!"clang version 3.9.0 "}
64!6 = distinct !DISubprogram(name: "success", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
65!7 = !DISubroutineType(types: !2)
66!8 = !DILocation(line: 2, column: 20, scope: !6)
67!9 = !DILocation(line: 3, column: 20, scope: !6)
68