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loop-rotate: eliminate duplicate debug intrinsics after splicing.
Fixes part of PR35113. llvm-svn: 317105
This commit is contained in:
Adrian Prantl
parent
88741fa2a0
commit
488750931a
@ -23,11 +23,13 @@
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/CFG.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/InstrTypes.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Type.h"
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#include "llvm/IR/User.h"
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@ -142,8 +144,16 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, DominatorTree *DT,
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}
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// Begin by getting rid of unneeded PHIs.
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if (isa<PHINode>(BB->front()))
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SmallVector<Value *, 4> IncomingValues;
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if (isa<PHINode>(BB->front())) {
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for (auto &I : *BB)
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if (PHINode *PN = dyn_cast<PHINode>(&I)) {
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if (PN->getIncomingValue(0) != PN)
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IncomingValues.push_back(PN->getIncomingValue(0));
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} else
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break;
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FoldSingleEntryPHINodes(BB, MemDep);
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}
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// Delete the unconditional branch from the predecessor...
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PredBB->getInstList().pop_back();
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@ -155,6 +165,18 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, DominatorTree *DT,
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// Move all definitions in the successor to the predecessor...
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PredBB->getInstList().splice(PredBB->end(), BB->getInstList());
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// Eliminate duplicate dbg.values describing the entry PHI node post-splice.
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for (auto *Incoming : IncomingValues) {
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SmallVector<DbgValueInst *, 2> DbgValues;
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SmallDenseSet<std::pair<DILocalVariable *, DIExpression *>, 2> DbgValueSet;
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llvm::findDbgValues(DbgValues, Incoming);
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for (auto &DVI : DbgValues) {
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auto R = DbgValueSet.insert({DVI->getVariable(), DVI->getExpression()});
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if (!R.second)
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DVI->eraseFromParent();
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}
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}
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// Inherit predecessors name if it exists.
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if (!PredBB->hasName())
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PredBB->takeName(BB);
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86
test/Transforms/LoopRotate/dbg-value-duplicates.ll
Normal file
86
test/Transforms/LoopRotate/dbg-value-duplicates.ll
Normal file
@ -0,0 +1,86 @@
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; RUN: opt -S -loop-rotate < %s | FileCheck %s
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source_filename = "/tmp/loop.c"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.13.0"
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; Function Attrs: nounwind ssp uwtable
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define void @f(float* %input, i64 %n, i64 %s) local_unnamed_addr #0 !dbg !8 {
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entry:
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call void @llvm.dbg.value(metadata float* %input, metadata !15, metadata !DIExpression()), !dbg !20
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call void @llvm.dbg.value(metadata i64 %n, metadata !16, metadata !DIExpression()), !dbg !21
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call void @llvm.dbg.value(metadata i64 %s, metadata !17, metadata !DIExpression()), !dbg !22
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call void @llvm.dbg.value(metadata i64 0, metadata !18, metadata !DIExpression()), !dbg !23
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br label %for.cond, !dbg !24
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for.cond: ; preds = %for.body, %entry
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; CHECK: %i.02 = phi i64 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
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%i.0 = phi i64 [ 0, %entry ], [ %add, %for.body ]
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call void @llvm.dbg.value(metadata i64 %i.0, metadata !18, metadata !DIExpression()), !dbg !23
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%cmp = icmp slt i64 %i.0, %n, !dbg !25
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br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !27
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for.cond.cleanup: ; preds = %for.cond
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ret void, !dbg !28
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for.body: ; preds = %for.cond
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%arrayidx = getelementptr inbounds float, float* %input, i64 %i.0, !dbg !29
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%0 = load float, float* %arrayidx, align 4, !dbg !29, !tbaa !30
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call void @bar(float %0), !dbg !34
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%add = add nsw i64 %i.0, %s, !dbg !35
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call void @llvm.dbg.value(metadata i64 %add, metadata !18, metadata !DIExpression()), !dbg !23
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; CHECK: call void @llvm.dbg.value(metadata i64 %add, metadata !18, metadata !DIExpression()), !dbg !23
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; CHECK-NOT: call void @llvm.dbg.value(metadata i64 %add, metadata !18, metadata !DIExpression()), !dbg !23
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br label %for.cond, !dbg !36, !llvm.loop !37
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}
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declare void @bar(float) local_unnamed_addr #1
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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attributes #0 = { nounwind ssp uwtable }
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attributes #2 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 316689) (llvm/trunk 316685)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "/tmp/loop.c", directory: "/Data/llvm")
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!2 = !{}
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!3 = !{i32 2, !"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 4}
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!6 = !{i32 7, !"PIC Level", i32 2}
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!7 = !{!"clang version 6.0.0 (trunk 316689) (llvm/trunk 316685)"}
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!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !14)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null, !11, !13, !13}
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!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
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!12 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
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!13 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
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!14 = !{!15, !16, !17, !18}
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!15 = !DILocalVariable(name: "input", arg: 1, scope: !8, file: !1, line: 2, type: !11)
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!16 = !DILocalVariable(name: "n", arg: 2, scope: !8, file: !1, line: 2, type: !13)
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!17 = !DILocalVariable(name: "s", arg: 3, scope: !8, file: !1, line: 2, type: !13)
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!18 = !DILocalVariable(name: "i", scope: !19, file: !1, line: 3, type: !13)
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!19 = distinct !DILexicalBlock(scope: !8, file: !1, line: 3, column: 3)
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!20 = !DILocation(line: 2, column: 15, scope: !8)
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!21 = !DILocation(line: 2, column: 32, scope: !8)
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!22 = !DILocation(line: 2, column: 45, scope: !8)
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!23 = !DILocation(line: 3, column: 18, scope: !19)
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!24 = !DILocation(line: 3, column: 8, scope: !19)
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!25 = !DILocation(line: 3, column: 26, scope: !26)
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!26 = distinct !DILexicalBlock(scope: !19, file: !1, line: 3, column: 3)
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!27 = !DILocation(line: 3, column: 3, scope: !19)
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!28 = !DILocation(line: 5, column: 1, scope: !8)
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!29 = !DILocation(line: 4, column: 9, scope: !26)
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!30 = !{!31, !31, i64 0}
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!31 = !{!"float", !32, i64 0}
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!32 = !{!"omnipotent char", !33, i64 0}
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!33 = !{!"Simple C/C++ TBAA"}
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!34 = !DILocation(line: 4, column: 5, scope: !26)
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!35 = !DILocation(line: 3, column: 31, scope: !26)
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!36 = !DILocation(line: 3, column: 3, scope: !26)
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!37 = distinct !{!37, !27, !38}
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!38 = !DILocation(line: 4, column: 17, scope: !19)
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