forked from OSchip/llvm-project
45 lines
1.8 KiB
LLVM
45 lines
1.8 KiB
LLVM
; The loop canonicalization pass should guarantee that there is one backedge
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; for all loops. This allows the -indvars pass to recognize the %IV
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; induction variable in this testcase.
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; RUN: opt < %s -indvars -S | FileCheck %s
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; CHECK: Loop.backedge:
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; CHECK-NOT: br
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; CHECK: br label %Loop, !dbg [[BACKEDGE_LOC:![0-9]+]]
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; CHECK: [[BACKEDGE_LOC]] = !DILocation(line: 101, column: 1, scope: !{{.*}})
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define i32 @test(i1 %C) {
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; <label>:0
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br label %Loop, !dbg !6
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Loop: ; preds = %BE2, %BE1, %0
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%IV = phi i32 [ 1, %0 ], [ %IV2, %BE1 ], [ %IV2, %BE2 ] ; <i32> [#uses=2]
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store i32 %IV, i32* null, !dbg !7
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%IV2 = add i32 %IV, 2, !dbg !8 ; <i32> [#uses=2]
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br i1 %C, label %BE1, label %BE2, !dbg !9
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BE1: ; preds = %Loop
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br label %Loop, !dbg !10
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BE2: ; preds = %n br label %Loop
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br label %Loop, !dbg !11
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}
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!llvm.module.flags = !{!0, !1}
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!llvm.dbg.cu = !{!12}
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!0 = !{i32 2, !"Dwarf Version", i32 4}
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!1 = !{i32 2, !"Debug Info Version", i32 3}
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!2 = !{}
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!3 = !DISubroutineType(types: !2)
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!4 = !DIFile(filename: "atomic.cpp", directory: "/tmp")
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!5 = distinct !DISubprogram(name: "test", scope: !4, file: !4, line: 99, type: !3, isLocal: false, isDefinition: true, scopeLine: 100, flags: DIFlagPrototyped, isOptimized: false, unit: !12, variables: !2)
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!6 = !DILocation(line: 100, column: 1, scope: !5)
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!7 = !DILocation(line: 101, column: 1, scope: !5)
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!8 = !DILocation(line: 102, column: 1, scope: !5)
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!9 = !DILocation(line: 103, column: 1, scope: !5)
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!10 = !DILocation(line: 104, column: 1, scope: !5)
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!11 = !DILocation(line: 105, column: 1, scope: !5)
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!12 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang",
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file: !4,
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isOptimized: true, flags: "-O2",
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splitDebugFilename: "abc.debug", emissionKind: 2)
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