1 ; RUN: opt < %s -gvn -S | FileCheck %s
2 ; CHECK: {{^}}for.body:
3 ; CHECK-NEXT: [[VREG1:%[^ ]+]] = phi{{.*}}[[VREG2:%[^ ]+]],{{.*}}%.sink,
7 ; CHECK-NEXT: [[VREG2]] = phi{{.*}}%inc,{{.*}}[[VREG1]]
9 target triple = "x86_64-unknown-linux-gnu"
11 @g = external local_unnamed_addr global i32, align 4
13 ; Function Attrs: nounwind uwtable
14 define void @foo(i32 %x, i32 %y, i32 %z) local_unnamed_addr #0 !dbg !4 {
16 %not.tobool = icmp eq i32 %x, 0, !dbg !8
17 %.sink = zext i1 %not.tobool to i32, !dbg !8
18 store i32 %.sink, i32* @g, align 4, !tbaa !9
19 %cmp8 = icmp sgt i32 %y, 0, !dbg !13
20 br i1 %cmp8, label %for.body.preheader, label %for.end, !dbg !17
22 for.body.preheader: ; preds = %entry
23 br label %for.body, !dbg !19
25 for.body: ; preds = %for.body.preheader, %for.inc
26 %i.09 = phi i32 [ %inc4, %for.inc ], [ 0, %for.body.preheader ]
27 %cmp1 = icmp sgt i32 %i.09, %z, !dbg !19
28 br i1 %cmp1, label %if.then2, label %for.inc, !dbg !21
30 if.then2: ; preds = %for.body
31 %0 = load i32, i32* @g, align 4, !dbg !22, !tbaa !9
32 %inc = add nsw i32 %0, 1, !dbg !22
33 store i32 %inc, i32* @g, align 4, !dbg !22, !tbaa !9
34 br label %for.inc, !dbg !23
36 for.inc: ; preds = %for.body, %if.then2
37 %inc4 = add nuw nsw i32 %i.09, 1, !dbg !24
38 %exitcond = icmp ne i32 %inc4, %y, !dbg !13
39 br i1 %exitcond, label %for.body, label %for.end.loopexit, !dbg !17
41 for.end.loopexit: ; preds = %for.inc
42 br label %for.end, !dbg !26
44 for.end: ; preds = %for.end.loopexit, %entry
48 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1)
49 !1 = !DIFile(filename: "foo.c", directory: "b/")
50 !2 = !{i32 2, !"Dwarf Version", i32 4}
51 !3 = !{i32 2, !"Debug Info Version", i32 3}
52 !4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0)
53 !5 = !DISubroutineType(types: !6)
54 !6 = !{null, !7, !7, !7}
55 !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
56 !8 = !DILocation(line: 4, column: 7, scope: !4)
57 !9 = !{!10, !10, i64 0}
58 !10 = !{!"int", !11, i64 0}
59 !11 = !{!"omnipotent char", !12, i64 0}
60 !12 = !{!"Simple C/C++ TBAA"}
61 !13 = !DILocation(line: 10, column: 13, scope: !14)
62 !14 = !DILexicalBlockFile(scope: !15, file: !1, discriminator: 1)
63 !15 = distinct !DILexicalBlock(scope: !16, file: !1, line: 10, column: 3)
64 !16 = distinct !DILexicalBlock(scope: !4, file: !1, line: 10, column: 3)
65 !17 = !DILocation(line: 10, column: 3, scope: !18)
66 !18 = !DILexicalBlockFile(scope: !16, file: !1, discriminator: 1)
67 !19 = !DILocation(line: 11, column: 11, scope: !20)
68 !20 = distinct !DILexicalBlock(scope: !15, file: !1, line: 11, column: 9)
69 !21 = !DILocation(line: 11, column: 9, scope: !15)
70 !22 = !DILocation(line: 12, column: 8, scope: !20)
71 !23 = !DILocation(line: 12, column: 7, scope: !20)
72 !24 = !DILocation(line: 10, column: 20, scope: !25)
73 !25 = !DILexicalBlockFile(scope: !15, file: !1, discriminator: 2)
74 !26 = !DILocation(line: 13, column: 1, scope: !4)
77 !llvm.module.flags = !{!2, !3}