forked from OSchip/llvm-project
[DebugInfo] Update loop metadata for inlined loops
Summary: Currently, when a loop is cloned while inlining function (A) into function (B) the loop metadata is copied and then not modified at all. The loop metadata can encode the loop's start and end DILocations. Therefore, the new inlined loop in function (B) may have loop metadata which shows start and end locations residing in function (A). This patch ensures loop metadata is updated while inlining so that the start and end DILocations are given the "inlinedAt" operand. I've also added a regression test for this. This fix is required for D60831 because that patch uses loop metadata to determine the DILocation for the branches of new loop preheaders. Reviewers: aprantl, dblaikie, anemet Reviewed By: aprantl Subscribers: eraman, hiraditya, llvm-commits Tags: #debug-info, #llvm Differential Revision: https://reviews.llvm.org/D61933 llvm-svn: 361132
This commit is contained in:
Orlando Cazalet-Hyams
parent
cb18647b19
commit
6e8f1a80cd
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@ -1351,6 +1351,44 @@ static bool allocaWouldBeStaticInEntry(const AllocaInst *AI ) {
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return isa<Constant>(AI->getArraySize()) && !AI->isUsedWithInAlloca();
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}
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/// Returns a DebugLoc for a new DILocation which is a clone of \p OrigDL
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/// inlined at \p InlinedAt. \p IANodes is an inlined-at cache.
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static DebugLoc inlineDebugLoc(DebugLoc OrigDL, DILocation *InlinedAt,
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LLVMContext &Ctx,
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DenseMap<const MDNode *, MDNode *> &IANodes) {
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auto IA = DebugLoc::appendInlinedAt(OrigDL, InlinedAt, Ctx, IANodes);
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return DebugLoc::get(OrigDL.getLine(), OrigDL.getCol(), OrigDL.getScope(),
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IA);
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}
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/// Returns the LoopID for a loop which has has been cloned from another
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/// function for inlining with the new inlined-at start and end locs.
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static MDNode *inlineLoopID(const MDNode *OrigLoopId, DILocation *InlinedAt,
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LLVMContext &Ctx,
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DenseMap<const MDNode *, MDNode *> &IANodes) {
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assert(OrigLoopId && OrigLoopId->getNumOperands() > 0 &&
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"Loop ID needs at least one operand");
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assert(OrigLoopId && OrigLoopId->getOperand(0).get() == OrigLoopId &&
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"Loop ID should refer to itself");
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// Save space for the self-referential LoopID.
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SmallVector<Metadata *, 4> MDs = {nullptr};
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for (unsigned i = 1; i < OrigLoopId->getNumOperands(); ++i) {
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Metadata *MD = OrigLoopId->getOperand(i);
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// Update the DILocations to encode the inlined-at metadata.
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if (DILocation *DL = dyn_cast<DILocation>(MD))
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MDs.push_back(inlineDebugLoc(DL, InlinedAt, Ctx, IANodes));
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else
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MDs.push_back(MD);
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}
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MDNode *NewLoopID = MDNode::getDistinct(Ctx, MDs);
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// Insert the self-referential LoopID.
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NewLoopID->replaceOperandWith(0, NewLoopID);
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return NewLoopID;
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}
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/// Update inlined instructions' line numbers to
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/// to encode location where these instructions are inlined.
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static void fixupLineNumbers(Function *Fn, Function::iterator FI,
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@ -1376,10 +1414,17 @@ static void fixupLineNumbers(Function *Fn, Function::iterator FI,
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for (; FI != Fn->end(); ++FI) {
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for (BasicBlock::iterator BI = FI->begin(), BE = FI->end();
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BI != BE; ++BI) {
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// Loop metadata needs to be updated so that the start and end locs
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// reference inlined-at locations.
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if (MDNode *LoopID = BI->getMetadata(LLVMContext::MD_loop)) {
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MDNode *NewLoopID =
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inlineLoopID(LoopID, InlinedAtNode, BI->getContext(), IANodes);
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BI->setMetadata(LLVMContext::MD_loop, NewLoopID);
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}
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if (DebugLoc DL = BI->getDebugLoc()) {
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auto IA = DebugLoc::appendInlinedAt(DL, InlinedAtNode, BI->getContext(),
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IANodes);
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auto IDL = DebugLoc::get(DL.getLine(), DL.getCol(), DL.getScope(), IA);
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DebugLoc IDL =
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inlineDebugLoc(DL, InlinedAtNode, BI->getContext(), IANodes);
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BI->setDebugLoc(IDL);
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continue;
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}
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@ -0,0 +1,108 @@
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; This test checks that the !llvm.loop metadata has been updated after inlining
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; so that the start and end locations refer to the inlined DILocations.
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; RUN: opt -loop-vectorize -inline %s -S 2>&1 | FileCheck %s
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; CHECK: br i1 %{{.*}}, label %middle.block.i, label %vector.body.i, !dbg !{{[0-9]+}}, !llvm.loop [[VECTOR:![0-9]+]]
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; CHECK: br i1 %{{.*}}, label %for.cond.cleanup.loopexit.i, label %for.body.i, !dbg !{{[0-9]+}}, !llvm.loop [[SCALAR:![0-9]+]]
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; CHECK-DAG: [[VECTOR]] = distinct !{[[VECTOR]], [[START:![0-9]+]], [[END:![0-9]+]], [[IS_VECTORIZED:![0-9]+]]}
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; CHECK-DAG: [[SCALAR]] = distinct !{[[SCALAR]], [[START]], [[END]], [[NO_UNROLL:![0-9]+]], [[IS_VECTORIZED]]}
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; CHECK-DAG: [[IS_VECTORIZED]] = !{!"llvm.loop.isvectorized", i32 1}
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; CHECK-DAG: [[NO_UNROLL]] = !{!"llvm.loop.unroll.runtime.disable"}
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; This IR can be generated by running:
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; clang -emit-llvm -S -gmlt -O2 inlined.cpp -o before.ll -mllvm -opt-bisect-limit=53
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;
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; Where inlined.cpp contains:
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; extern int *Array;
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; static int bar(unsigned x)
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; {
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; int Ret = 0;
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; for (unsigned i = 0; i < x; ++i)
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; {
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; Ret += Array[i] * i;
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; }
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; return Ret;
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; }
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;
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; int foo(unsigned x)
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; {
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; int Bar = bar(x);
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; return Bar;
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; }
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; ModuleID = 'inlined.cpp'
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source_filename = "inlined.cpp"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc19.16.27030"
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@"?Array@@3PEAHEA" = external dso_local local_unnamed_addr global i32*, align 8
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; Function Attrs: nounwind uwtable
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define dso_local i32 @"?foo@@YAHI@Z"(i32 %x) local_unnamed_addr !dbg !8 {
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entry:
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%call = call fastcc i32 @"?bar@@YAHI@Z"(i32 %x), !dbg !10
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ret i32 %call, !dbg !11
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}
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; Function Attrs: norecurse nounwind readonly uwtable
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define internal fastcc i32 @"?bar@@YAHI@Z"(i32 %x) unnamed_addr !dbg !12 {
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entry:
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%cmp7 = icmp eq i32 %x, 0, !dbg !13
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br i1 %cmp7, label %for.cond.cleanup, label %for.body.lr.ph, !dbg !13
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for.body.lr.ph: ; preds = %entry
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%0 = load i32*, i32** @"?Array@@3PEAHEA", align 8, !dbg !14, !tbaa !15
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%wide.trip.count = zext i32 %x to i64, !dbg !14
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br label %for.body, !dbg !13
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for.cond.cleanup.loopexit: ; preds = %for.body
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%add.lcssa = phi i32 [ %add, %for.body ], !dbg !19
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br label %for.cond.cleanup, !dbg !20
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for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
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%Ret.0.lcssa = phi i32 [ 0, %entry ], [ %add.lcssa, %for.cond.cleanup.loopexit ], !dbg !14
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ret i32 %Ret.0.lcssa, !dbg !20
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for.body: ; preds = %for.body, %for.body.lr.ph
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%indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ]
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%Ret.08 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %0, i64 %indvars.iv, !dbg !19
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%1 = load i32, i32* %arrayidx, align 4, !dbg !19, !tbaa !21
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%2 = trunc i64 %indvars.iv to i32, !dbg !19
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%mul = mul i32 %1, %2, !dbg !19
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%add = add i32 %mul, %Ret.08, !dbg !19
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !13
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%exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count, !dbg !13
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br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body, !dbg !13, !llvm.loop !23
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}
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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_C_plus_plus, file: !1, producer: "clang version 9.0.0 (https://github.com/llvm/llvm-project.git b1e28d9b6a16380ccf1456fe0695f639364407a9)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "inlined.cpp", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"CodeView", i32 1}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 2}
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!6 = !{i32 7, !"PIC Level", i32 2}
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!7 = !{!"clang version 9.0.0 (https://github.com/llvm/llvm-project.git b1e28d9b6a16380ccf1456fe0695f639364407a9)"}
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!8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 13, type: !9, scopeLine: 14, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
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!9 = !DISubroutineType(types: !2)
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!10 = !DILocation(line: 15, scope: !8)
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!11 = !DILocation(line: 16, scope: !8)
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!12 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 3, type: !9, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
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!13 = !DILocation(line: 6, scope: !12)
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!14 = !DILocation(line: 0, scope: !12)
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!15 = !{!16, !16, i64 0}
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!16 = !{!"any pointer", !17, i64 0}
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!17 = !{!"omnipotent char", !18, i64 0}
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!18 = !{!"Simple C++ TBAA"}
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!19 = !DILocation(line: 8, scope: !12)
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!20 = !DILocation(line: 10, scope: !12)
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!21 = !{!22, !22, i64 0}
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!22 = !{!"int", !17, i64 0}
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!23 = distinct !{!23, !13, !24}
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!24 = !DILocation(line: 9, scope: !12)
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