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4d4e52ff5c
Summary: In commit d60f34c20a2f31335c8d5626e (llvm-svn 317128, PR35113) MergeBlockIntoPredecessor was changed into discarding some dbg.value intrinsics referring to PHI values, post-splice due to loop rotation. That elimination of dbg.value intrinsics did not consider which dbg.value to keep depending on the context (e.g. if the variable is changing its value several times inside the basic block). In the past that hasn't been such a big problem since CodeGenPrepare::placeDbgValues has moved the dbg.value to be next to the PHI node anyway. But after commit 00e238896cd8ad3a7d7 CodeGenPrepare isn't doing that any longer, so we need to be more careful when avoiding duplicate dbg.value intrinsics in MergeBlockIntoPredecessor. This patch replaces the code that tried to avoid duplicate dbg.values by using the RemoveRedundantDbgInstrs helper. Reviewers: aprantl, jmorse, vsk Reviewed By: aprantl, vsk Subscribers: jholewinski, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D71480
78 lines
3.5 KiB
LLVM
78 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -loop-rotate -S | FileCheck %s
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define dso_local i16 @main() local_unnamed_addr #0 !dbg !7 {
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; CHECK-LABEL: @main(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i16 9, metadata !12, metadata !DIExpression()), !dbg !13
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; CHECK-NEXT: br label [[BB2:%.*]], !dbg !14
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; CHECK: bb2:
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; CHECK-NEXT: [[TMP1:%.*]] = phi i16 [ 9, [[ENTRY:%.*]] ], [ [[TMP5:%.*]], [[BB2]] ]
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i16 [[TMP1]], metadata !12, metadata !DIExpression()), !dbg !13
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; CHECK-NEXT: [[TMP4:%.*]] = call i16 @wibble(i16 [[TMP1]]), !dbg !14
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; CHECK-NEXT: [[TMP5]] = add nsw i16 [[TMP4]], [[TMP1]], !dbg !14
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i16 [[TMP5]], metadata !12, metadata !DIExpression()), !dbg !13
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; CHECK-NEXT: [[TMP6:%.*]] = call i16 @wibble(i16 [[TMP4]]), !dbg !14
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; CHECK-NEXT: [[TMP7:%.*]] = mul nsw i16 [[TMP6]], 3, !dbg !14
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; CHECK-NEXT: [[TMP8:%.*]] = call i16 @wibble(i16 [[TMP7]]), !dbg !14
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; CHECK-NEXT: [[TMP2:%.*]] = icmp slt i16 [[TMP5]], 17, !dbg !14
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; CHECK-NEXT: br i1 [[TMP2]], label [[BB2]], label [[BB3:%.*]], !dbg !14
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; CHECK: bb3:
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; CHECK-NEXT: [[TMP10:%.*]] = call i16 @wibble(i16 8), !dbg !14
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; CHECK-NEXT: ret i16 [[TMP10]], !dbg !14
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;
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entry:
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call void @llvm.dbg.value(metadata i16 9, metadata !12, metadata !DIExpression()), !dbg !13
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br label %bb1, !dbg !14
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bb1:
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%tmp = phi i16 [ 9, %entry ], [ %tmp5, %bb2 ], !dbg !13
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call void @llvm.dbg.value(metadata i16 %tmp, metadata !12, metadata !DIExpression()), !dbg !13
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%tmp2 = icmp slt i16 %tmp, 17, !dbg !16
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br i1 %tmp2, label %bb2, label %bb3, !dbg !16
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bb2:
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%tmp4 = call i16 @wibble(i16 %tmp), !dbg !16
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%tmp5 = add nsw i16 %tmp4, %tmp, !dbg !16
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call void @llvm.dbg.value(metadata i16 %tmp5, metadata !12, metadata !DIExpression()), !dbg !13
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%tmp6 = call i16 @wibble(i16 %tmp4), !dbg !16
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%tmp7 = mul nsw i16 %tmp6, 3, !dbg !16
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%tmp8 = call i16 @wibble(i16 %tmp7), !dbg !16
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br label %bb1, !dbg !16
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bb3:
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%tmp10 = call i16 @wibble(i16 8), !dbg !16
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ret i16 %tmp10, !dbg !16
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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declare i16 @wibble(i16) #2
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attributes #0 = { noinline nounwind }
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attributes #1 = { nounwind readnone speculatable willreturn }
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attributes #2 = { noinline nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, nameTableKind: None)
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!1 = !DIFile(filename: "foo.c", directory: "")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 1}
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!6 = !{!"clang version 10.0.0"}
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!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 8, type: !8, scopeLine: 8, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
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!11 = !{!12}
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!12 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 9, type: !10)
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!13 = !DILocation(line: 0, scope: !7)
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!14 = !DILocation(line: 11, column: 8, scope: !15)
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!15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 11, column: 3)
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!16 = !DILocation(line: 11, column: 21, scope: !17)
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!17 = distinct !DILexicalBlock(scope: !15, file: !1, line: 11, column: 3)
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