ee4ba9f3a1
Unfortunately, it seems we really do need to take the long route; start from the "merge" block, find (all the) "dispatch" blocks, and deal with each "dispatch" block separately, instead of simply starting from each "dispatch" block like it would logically make sense, otherwise we run into a number of other missing folds around `switch` formation, missing sinking/hoisting and phase ordering. This reverts commit85628ce75b. This reverts commitc5fff90953. This reverts commit34a98e1046. This reverts commit1e353f0922.
52 lines
2.0 KiB
LLVM
52 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -simplifycfg -simplifycfg-require-and-preserve-domtree=1 | FileCheck %s
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; In 'simplifycfg', during the flattening of a 'br', the instructions for the
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; 'true' and 'false' parts, are moved out from their respective basic blocks.
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; Their original debug locations (DILocations) and debug intrinsic instructions
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; (dbg.values) are removed.
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; As those basic blocks are now empty, their associated labels are removed.
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;
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; For the given test case, the labels 'W' and 'cleanup4' are removed.
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; We're expecting the dbg.label associated with 'W' to disappear, because
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; the 'W' label was removed.
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define i16 @_Z7test_itv() {
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; CHECK-LABEL: @_Z7test_itv(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[RETVAL_0:%.*]] = select i1 undef, i16 1, i16 0
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; CHECK-NEXT: ret i16 0
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;
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entry:
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br label %sw.bb
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sw.bb: ; preds = %entry
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br i1 undef, label %W, label %cleanup4
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W: ; preds = %sw.bb
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call void @llvm.dbg.label(metadata !1), !dbg !8
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br label %cleanup4
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cleanup4: ; preds = %W, %sw.bb
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%retval.0 = phi i16 [ 1, %W ], [ 0, %sw.bb ]
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ret i16 0
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.label(metadata) #0
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attributes #0 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{}
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!llvm.module.flags = !{!0}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = !DILabel(scope: !2, name: "W", file: !3, line: 47)
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!2 = distinct !DILexicalBlock(scope: !4, file: !3, line: 40, column: 3)
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!3 = !DIFile(filename: "foo.c", directory: "./")
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!4 = distinct !DISubprogram(name: "test_it", scope: !3, file: !3, line: 35, type: !5, scopeLine: 36, unit: !7)
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!5 = !DISubroutineType(types: !6)
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!6 = !{}
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!7 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!8 = !DILocation(line: 47, column: 2, scope: !2)
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