; RUN: opt -S -lcssa < %s | FileCheck %s
-target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
-target triple = "x86_64-unknown-linux-gnu"
-
; Reproducer for PR39019.
;
-; Verify that the llvm.dbg.value in the %for.cond.cleanup2 block is rewritten
-; to use the PHI node for %add that is created by LCSSA.
+; Verify that the llvm.dbg.values are updated to use the PHI nodes inserted by
+; LCSSA.
-; CHECK-LABEL: for.cond.cleanup2:
-; CHECK-NEXT: [[PN:%[^ ]*]] = phi i32 [ %add.lcssa, %for.cond.cleanup1 ]
-; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN]], metadata [[VAR:![0-9]+]], metadata !DIExpression())
-; CHECK-NEXT: call void @bar(i32 [[PN]])
+; For the test case @single_exit, we can rewrite all llvm.dbg.value calls
+; to use the inserted PHI.
-; CHECK-LABEL: for.body:
+; CHECK-LABEL: @single_exit(
+
+; CHECK-LABEL: inner.body:
; CHECK: %add = add nsw i32 0, 2
-; CHECK: call void @llvm.dbg.value(metadata i32 %add, metadata [[VAR]], metadata !DIExpression())
+; CHECK: call void @llvm.dbg.value(metadata i32 %add, metadata [[VAR:![0-9]+]], metadata !DIExpression())
-; CHECK: [[VAR]] = !DILocalVariable(name: "sum",
-; Function Attrs: nounwind
-define void @foo() #0 !dbg !6 {
+; CHECK-LABEL: outer.exit:
+; CHECK-NEXT: [[PN:%[^ ]*]] = phi i32 [ %add.lcssa, %outer.latch ]
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN]], metadata [[VAR]], metadata !DIExpression())
+; CHECK-NEXT: call void @bar(i32 [[PN]])
+
+; CHECK-LABEL: exit:
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN]], metadata [[VAR]], metadata !DIExpression())
+
+define void @single_exit() !dbg !6 {
entry:
- br label %for.cond.preheader, !dbg !12
+ br label %outer.header, !dbg !12
-for.cond.preheader: ; preds = %for.cond.cleanup1, %entry
- br label %for.body, !dbg !12
+outer.header: ; preds = %outer.latch, %entry
+ br label %inner.body, !dbg !12
-for.cond.cleanup2: ; preds = %for.cond.cleanup1
+inner.body: ; preds = %inner.body, %outer.header
+ %add = add nsw i32 0, 2, !dbg !12
call void @llvm.dbg.value(metadata i32 %add, metadata !9, metadata !DIExpression()), !dbg !12
- tail call void @bar(i32 %add) #0, !dbg !12
- ret void, !dbg !12
+ br i1 false, label %inner.body, label %inner.exit, !dbg !12
-for.cond.cleanup1: ; preds = %for.body
- br i1 false, label %for.cond.preheader, label %for.cond.cleanup2, !dbg !12
+inner.exit: ; preds = %inner.body
+ br label %outer.latch
-for.body: ; preds = %for.body, %for.cond.preheader
- %add = add nsw i32 0, 2, !dbg !12
+outer.latch: ; preds = %inner.exit
+ br i1 false, label %outer.header, label %outer.exit, !dbg !12
+
+outer.exit: ; preds = %outer.latch
+ call void @llvm.dbg.value(metadata i32 %add, metadata !9, metadata !DIExpression()), !dbg !12
+ tail call void @bar(i32 %add), !dbg !12
+ br label %exit
+
+exit: ; preds = %outer.exit
call void @llvm.dbg.value(metadata i32 %add, metadata !9, metadata !DIExpression()), !dbg !12
- br i1 false, label %for.body, label %for.cond.cleanup1, !dbg !12
+ ret void, !dbg !12
}
-; Function Attrs: nounwind
-declare void @bar(i32) #0
+; For the test case @multi_exit, we cannot update the llvm.dbg.value call in exit,
+; because LCSSA did not insert a PHI node in %exit, as there is no non-debug
+; use.
+
+; CHECK-LABEL: @multi_exit()
+
+; CHECK-LABEL: for.header:
+; CHECK-NEXT: %add = add nsw i32 0, 2
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %add, metadata [[VAR2:![0-9]+]], metadata !DIExpression())
+
+; CHECK-LABEL: for.exit1:
+; CHECK-NEXT: [[PN1:%[^ ]*]] = phi i32 [ %add, %for.header ]
+; CHECK-NEXT: br label %for.exit1.succ
+
+; CHECK-LABEL: for.exit1.succ:
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN1]], metadata [[VAR2]], metadata !DIExpression())
+; CHECK-NEXT: call void @bar(i32 [[PN1]])
+
+; CHECK-LABEL: for.exit2:
+; CHECK-NEXT: [[PN2:%[^ ]*]] = phi i32 [ %add, %for.latch ]
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[PN2]], metadata [[VAR2]], metadata !DIExpression())
+; CHECK-NEXT: call void @bar(i32 [[PN2]])
+
+; CHECK-LABEL: exit:
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %add, metadata [[VAR2]], metadata !DIExpression())
+
+define void @multi_exit() !dbg !13 {
+entry:
+ br label %for.header, !dbg !14
+
+for.header: ; preds = %for.latch, %entry
+ %add = add nsw i32 0, 2, !dbg !14
+ call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !14
+ br i1 false, label %for.latch, label %for.exit1, !dbg !14
+
+for.latch: ; preds = %for.header
+ br i1 false, label %for.header, label %for.exit2, !dbg !14
+
+for.exit1: ; preds = %for.header
+ br label %for.exit1.succ
+
+for.exit1.succ: ; preds = %for.exit1
+ call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !14
+ tail call void @bar(i32 %add), !dbg !14
+ br label %exit
+
+for.exit2: ; preds = %for.latch
+ call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !14
+ tail call void @bar(i32 %add), !dbg !14
+ br label %exit
+
+exit: ; preds = %for.exit2, %for.exit1.succ
+ call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !14
+ ret void, !dbg !14
+}
+
+; CHECK: [[VAR]] = !DILocalVariable(name: "sum",
+; CHECK: [[VAR2]] = !DILocalVariable(name: "sum2",
-; Function Attrs: nounwind readnone speculatable
-declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+declare void @bar(i32)
-attributes #0 = { nounwind }
-attributes #1 = { nounwind readnone speculatable }
+declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{!"clang version 8.0.0"}
-!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 10, type: !7, isLocal: false, isDefinition: true, scopeLine: 10, isOptimized: true, unit: !0, retainedNodes: !8)
+!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 10, type: !7, scopeLine: 10, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
!7 = !DISubroutineType(types: !2)
!8 = !{!9}
!9 = !DILocalVariable(name: "sum", scope: !10, file: !1, line: 11, type: !11)
!10 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 0)
!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!12 = !DILocation(line: 0, scope: !10)
+!13 = distinct !DISubprogram(name: "multi_exit", scope: !1, file: !1, line: 10, type: !7, scopeLine: 10, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
+!14 = !DILocation(line: 0, scope: !15)
+!15 = !DILexicalBlockFile(scope: !13, file: !1, discriminator: 0)
+!16 = !DILocalVariable(name: "sum2", scope: !15, file: !1, line: 11, type: !11)