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llvm-project/llvm/test/Transforms/BDCE/pr41925.ll

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Clang-trunk Generates Wrong Debug values with -O1 Bit-Tracking Dead Code Elimination (bdce) do not mark dbg.value as undef after deleting instruction. which shows invalid state of variable in debugger. This patches fixes this by marking the dbg.value as undef which depends on dead instruction. This fixes https://bugs.llvm.org/show_bug.cgi?id=41925 Patch by kamlesh kumar! Differential Revision: https://reviews.llvm.org/D70040
2019-11-22 05:53:10 +08:00
; Check for setting dbg.value undef which depends on instruction which is going to be dead
[test] Update some test cases to use -passes when specifying the pipeline This updates transform test cases for ADCE AddDiscriminators AggressiveInstCombine AlignmentFromAssumptions ArgumentPromotion BDCE CalledValuePropagation DCE Reg2Mem WholeProgramDevirt to use the -passes syntax when specifying the pipeline. Given that LLVM_ENABLE_NEW_PASS_MANAGER isn't set to off (which is a deprecated feature) the updated test cases already used the new pass manager, but they were using the legacy syntax when specifying the passes to run. This patch can be seen as a step toward deprecating that interface. This patch also removes some redundant RUN lines. Here I am referring to test cases that had multiple RUN lines verifying both the legacy "-passname" syntax and the new "-passes=passname" syntax. Since we switched the default pass manager to "new PM" both RUN lines have verified the new PM version of the pass (more or less wasting time running the same test twice), unless LLVM_ENABLE_NEW_PASS_MANAGER is set to "off". It is assumed that it is enough to run these tests with the new pass manager now. Differential Revision: https://reviews.llvm.org/D108472
2021-09-13 16:43:38 +08:00
; RUN: opt -passes=bdce %s -S | FileCheck %s
Clang-trunk Generates Wrong Debug values with -O1 Bit-Tracking Dead Code Elimination (bdce) do not mark dbg.value as undef after deleting instruction. which shows invalid state of variable in debugger. This patches fixes this by marking the dbg.value as undef which depends on dead instruction. This fixes https://bugs.llvm.org/show_bug.cgi?id=41925 Patch by kamlesh kumar! Differential Revision: https://reviews.llvm.org/D70040
2019-11-22 05:53:10 +08:00
; Generated from this
; char a, b;
; void optimize_me_not();
; int main() {
; char l_177 = 2;
; for (; b <= 0; b++)
; for (; a >= 0; a--) {
; ++l_177;
; optimize_me_not();
; }
; }
@b = common dso_local local_unnamed_addr global i8 0, align 1, !dbg !0
@a = common dso_local local_unnamed_addr global i8 0, align 1, !dbg !6
define dso_local i32 @main() local_unnamed_addr !dbg !13 {
entry:
;CHECK: call void @llvm.dbg.value(metadata i8 2
;CHECK: call void @llvm.dbg.value(metadata i8 2
call void @llvm.dbg.value(metadata i8 2, metadata !17, metadata !DIExpression()), !dbg !18
%.pr = load i8, i8* @b, align 1, !dbg !19
call void @llvm.dbg.value(metadata i8 2, metadata !17, metadata !DIExpression()), !dbg !18
%cmp5 = icmp slt i8 %.pr, 1, !dbg !22
br i1 %cmp5, label %for.cond2thread-pre-split.preheader, label %for.end9, !dbg !23
for.cond2thread-pre-split.preheader: ; preds = %entry
br label %for.cond2thread-pre-split, !dbg !23
for.cond2thread-pre-split: ; preds = %for.cond2thread-pre-split.preheader, %for.inc7
;CHECK: call void @llvm.dbg.value(metadata i8 undef
%l_177.06 = phi i8 [ %l_177.1.lcssa, %for.inc7 ], [ 2, %for.cond2thread-pre-split.preheader ]
call void @llvm.dbg.value(metadata i8 %l_177.06, metadata !17, metadata !DIExpression()), !dbg !18
;CHECK: call void @llvm.dbg.value(metadata i8 undef
%.pr1 = load i8, i8* @a, align 1, !dbg !24
call void @llvm.dbg.value(metadata i8 %l_177.06, metadata !17, metadata !DIExpression()), !dbg !18
%cmp42 = icmp sgt i8 %.pr1, -1, !dbg !27
br i1 %cmp42, label %for.body6.preheader, label %for.inc7, !dbg !28
for.body6.preheader: ; preds = %for.cond2thread-pre-split
br label %for.body6, !dbg !28
for.body6: ; preds = %for.body6.preheader, %for.body6
;CHECK: call void @llvm.dbg.value(metadata i8 undef
;CHECK: call void @llvm.dbg.value(metadata i8 undef
%l_177.13 = phi i8 [ %inc, %for.body6 ], [ %l_177.06, %for.body6.preheader ]
call void @llvm.dbg.value(metadata i8 %l_177.13, metadata !17, metadata !DIExpression()), !dbg !18
call void @llvm.dbg.value(metadata i8 %l_177.13, metadata !17, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !18
tail call void (...) @optimize_me_not(), !dbg !29
%inc = add i8 %l_177.13, 1, !dbg !31
%0 = load i8, i8* @a, align 1, !dbg !32
%dec = add i8 %0, -1, !dbg !32
store i8 %dec, i8* @a, align 1, !dbg !32
call void @llvm.dbg.value(metadata i8 %inc, metadata !17, metadata !DIExpression()), !dbg !18
%cmp4 = icmp sgt i8 %dec, -1, !dbg !27
br i1 %cmp4, label %for.body6, label %for.inc7.loopexit, !dbg !28, !llvm.loop !33
for.inc7.loopexit: ; preds = %for.body6
%inc.lcssa = phi i8 [ %inc, %for.body6 ], !dbg !31
br label %for.inc7, !dbg !35
for.inc7: ; preds = %for.inc7.loopexit, %for.cond2thread-pre-split
;CHECK: call void @llvm.dbg.value(metadata i8 undef
%l_177.1.lcssa = phi i8 [ %l_177.06, %for.cond2thread-pre-split ], [ %inc.lcssa, %for.inc7.loopexit ], !dbg !18
%1 = load i8, i8* @b, align 1, !dbg !35
%inc8 = add i8 %1, 1, !dbg !35
store i8 %inc8, i8* @b, align 1, !dbg !35
call void @llvm.dbg.value(metadata i8 %l_177.1.lcssa, metadata !17, metadata !DIExpression()), !dbg !18
%cmp = icmp slt i8 %inc8, 1, !dbg !22
br i1 %cmp, label %for.cond2thread-pre-split, label %for.end9.loopexit, !dbg !23, !llvm.loop !36
for.end9.loopexit: ; preds = %for.inc7
br label %for.end9, !dbg !38
for.end9: ; preds = %for.end9.loopexit, %entry
ret i32 0, !dbg !38
}
declare dso_local void @optimize_me_not(...) local_unnamed_addr
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!9, !10, !11}
!llvm.ident = !{!12}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 3, type: !8, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
!3 = !DIFile(filename: "test", directory: "test")
!4 = !{}
!5 = !{!6, !0}
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 3, type: !8, isLocal: false, isDefinition: true)
!8 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!9 = !{i32 2, !"Dwarf Version", i32 4}
!10 = !{i32 2, !"Debug Info Version", i32 3}
!11 = !{i32 1, !"wchar_size", i32 4}
!12 = !{!"clang version 10.0.0"}
!13 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 4, type: !14, scopeLine: 4, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !4)
!14 = !DISubroutineType(types: !15)
!15 = !{!16}
!16 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!17 = !DILocalVariable(name: "l_177", scope: !13, file: !3, line: 5, type: !8)
!18 = !DILocation(line: 0, scope: !13)
!19 = !DILocation(line: 6, column: 10, scope: !20)
!20 = distinct !DILexicalBlock(scope: !21, file: !3, line: 6, column: 3)
!21 = distinct !DILexicalBlock(scope: !13, file: !3, line: 6, column: 3)
!22 = !DILocation(line: 6, column: 12, scope: !20)
!23 = !DILocation(line: 6, column: 3, scope: !21)
!24 = !DILocation(line: 7, column: 12, scope: !25)
!25 = distinct !DILexicalBlock(scope: !26, file: !3, line: 7, column: 5)
!26 = distinct !DILexicalBlock(scope: !20, file: !3, line: 7, column: 5)
!27 = !DILocation(line: 7, column: 14, scope: !25)
!28 = !DILocation(line: 7, column: 5, scope: !26)
!29 = !DILocation(line: 9, column: 7, scope: !30)
!30 = distinct !DILexicalBlock(scope: !25, file: !3, line: 7, column: 25)
!31 = !DILocation(line: 8, column: 7, scope: !30)
!32 = !DILocation(line: 7, column: 21, scope: !25)
!33 = distinct !{!33, !28, !34}
!34 = !DILocation(line: 10, column: 5, scope: !26)
!35 = !DILocation(line: 6, column: 19, scope: !20)
!36 = distinct !{!36, !23, !37}
!37 = !DILocation(line: 10, column: 5, scope: !21)
!38 = !DILocation(line: 11, column: 1, scope: !13)