[llvm] [CodeGen][DebugInfo] Add missing debug info for jump table BB (PR #71021)
via llvm-commits
llvm-commits at lists.llvm.org
Wed Nov 1 23:11:44 PDT 2023
https://github.com/HaohaiWen updated https://github.com/llvm/llvm-project/pull/71021
>From 1be56cf6541d34e4e2ead3f4b3d3ce482d69f68f Mon Sep 17 00:00:00 2001
From: Haohai Wen <haohai.wen at intel.com>
Date: Thu, 2 Nov 2023 12:14:15 +0800
Subject: [PATCH 1/3] [DebugInfo] Add debug info test for jump table
Test whether jump table BB has debug info after ISel.
---
.../Generic/debug-info-jump-table.ll | 176 ++++++++++++++++++
1 file changed, 176 insertions(+)
create mode 100644 llvm/test/DebugInfo/Generic/debug-info-jump-table.ll
diff --git a/llvm/test/DebugInfo/Generic/debug-info-jump-table.ll b/llvm/test/DebugInfo/Generic/debug-info-jump-table.ll
new file mode 100644
index 000000000000000..b73d05441f654bb
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/debug-info-jump-table.ll
@@ -0,0 +1,176 @@
+; RUN: llc -debug-only=isel %s -o /dev/null 2>&1 | FileCheck --match-full-lines %s
+
+source_filename = "jump_table.c"
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+ at str = private unnamed_addr constant [2 x i8] c"1\00", align 1
+ at str.12 = private unnamed_addr constant [2 x i8] c"2\00", align 1
+ at str.13 = private unnamed_addr constant [2 x i8] c"3\00", align 1
+ at str.14 = private unnamed_addr constant [2 x i8] c"4\00", align 1
+ at str.15 = private unnamed_addr constant [2 x i8] c"5\00", align 1
+ at str.16 = private unnamed_addr constant [2 x i8] c"6\00", align 1
+ at str.17 = private unnamed_addr constant [2 x i8] c"7\00", align 1
+ at str.18 = private unnamed_addr constant [2 x i8] c"8\00", align 1
+ at str.19 = private unnamed_addr constant [2 x i8] c"9\00", align 1
+ at str.20 = private unnamed_addr constant [3 x i8] c"10\00", align 1
+ at str.21 = private unnamed_addr constant [3 x i8] c"11\00", align 1
+ at str.22 = private unnamed_addr constant [3 x i8] c"12\00", align 1
+
+
+
+; Function Attrs: nofree nounwind uwtable
+define dso_local void @foo(i32 noundef %cond) local_unnamed_addr #0 !dbg !42 {
+;CHECK: Initial selection DAG: %bb.{{[0-9]+}} 'foo:entry'
+;CHECK: SelectionDAG has 5 nodes:
+;CHECK: [[TMP1:t.*]]: ch,glue = EntryToken
+;CHECK: [[TMP2:t.*]]: i64,ch = CopyFromReg [[TMP1]], Register:i64 %{{[0-9]+}}
+;CHECK: t{{[0-9]+}}: ch = br_jt [[TMP2]]:1, JumpTable:i64<0>, [[TMP2]]
+
+entry:
+ call void @llvm.dbg.value(metadata i32 %cond, metadata !47, metadata !DIExpression()), !dbg !48
+ switch i32 %cond, label %sw.epilog [
+ i32 1, label %sw.bb
+ i32 2, label %sw.bb1
+ i32 3, label %sw.bb3
+ i32 4, label %sw.bb5
+ i32 5, label %sw.bb7
+ i32 6, label %sw.bb9
+ i32 7, label %sw.bb11
+ i32 8, label %sw.bb13
+ i32 9, label %sw.bb15
+ i32 10, label %sw.bb17
+ i32 11, label %sw.bb19
+ i32 12, label %sw.bb21
+ ], !dbg !49
+
+sw.bb: ; preds = %entry
+ %puts = tail call i32 @puts(ptr nonnull dereferenceable(1) @str), !dbg !50
+ br label %sw.bb1, !dbg !50
+
+sw.bb1: ; preds = %entry, %sw.bb
+ %puts23 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.12), !dbg !52
+ br label %sw.bb3, !dbg !52
+
+sw.bb3: ; preds = %entry, %sw.bb1
+ %puts24 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.13), !dbg !53
+ br label %sw.bb5, !dbg !53
+
+sw.bb5: ; preds = %entry, %sw.bb3
+ %puts25 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.14), !dbg !54
+ br label %sw.bb7, !dbg !54
+
+sw.bb7: ; preds = %entry, %sw.bb5
+ %puts26 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.15), !dbg !55
+ br label %sw.bb9, !dbg !55
+
+sw.bb9: ; preds = %entry, %sw.bb7
+ %puts27 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.16), !dbg !56
+ br label %sw.bb11, !dbg !56
+
+sw.bb11: ; preds = %entry, %sw.bb9
+ %puts28 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.17), !dbg !57
+ br label %sw.bb13, !dbg !57
+
+sw.bb13: ; preds = %entry, %sw.bb11
+ %puts29 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.18), !dbg !58
+ br label %sw.bb15, !dbg !58
+
+sw.bb15: ; preds = %entry, %sw.bb13
+ %puts30 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.19), !dbg !59
+ br label %sw.bb17, !dbg !59
+
+sw.bb17: ; preds = %entry, %sw.bb15
+ %puts31 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.20), !dbg !60
+ br label %sw.bb19, !dbg !60
+
+sw.bb19: ; preds = %entry, %sw.bb17
+ %puts32 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.21), !dbg !61
+ br label %sw.bb21, !dbg !61
+
+sw.bb21: ; preds = %entry, %sw.bb19
+ %puts33 = tail call i32 @puts(ptr nonnull dereferenceable(1) @str.22), !dbg !62
+ ret void, !dbg !63
+
+sw.epilog: ; preds = %entry
+ ret void, !dbg !63
+}
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+
+; Function Attrs: nofree nounwind
+declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #2
+
+attributes #0 = { nofree nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
+attributes #2 = { nofree nounwind }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!34, !35, !36, !37, !38, !39, !40}
+!llvm.ident = !{!41}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 18.0.0 (https://github.com/llvm/llvm-project.git 24cf476bd6d144b9fa28325b4d16e3c9dbfc4d4f)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, globals: !2, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "jump_table.c", directory: "/export/compilers/llvm-project", checksumkind: CSK_MD5, checksum: "0847b70de02e07499cd0177d1bdc6dae")
+!2 = !{!3, !9, !11, !13, !15, !17, !19, !21, !23, !25, !30, !32}
+!3 = !DIGlobalVariableExpression(var: !4, expr: !DIExpression())
+!4 = distinct !DIGlobalVariable(scope: null, file: !1, line: 6, type: !5, isLocal: true, isDefinition: true)
+!5 = !DICompositeType(tag: DW_TAG_array_type, baseType: !6, size: 24, elements: !7)
+!6 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!7 = !{!8}
+!8 = !DISubrange(count: 3)
+!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
+!10 = distinct !DIGlobalVariable(scope: null, file: !1, line: 8, type: !5, isLocal: true, isDefinition: true)
+!11 = !DIGlobalVariableExpression(var: !12, expr: !DIExpression())
+!12 = distinct !DIGlobalVariable(scope: null, file: !1, line: 10, type: !5, isLocal: true, isDefinition: true)
+!13 = !DIGlobalVariableExpression(var: !14, expr: !DIExpression())
+!14 = distinct !DIGlobalVariable(scope: null, file: !1, line: 12, type: !5, isLocal: true, isDefinition: true)
+!15 = !DIGlobalVariableExpression(var: !16, expr: !DIExpression())
+!16 = distinct !DIGlobalVariable(scope: null, file: !1, line: 14, type: !5, isLocal: true, isDefinition: true)
+!17 = !DIGlobalVariableExpression(var: !18, expr: !DIExpression())
+!18 = distinct !DIGlobalVariable(scope: null, file: !1, line: 16, type: !5, isLocal: true, isDefinition: true)
+!19 = !DIGlobalVariableExpression(var: !20, expr: !DIExpression())
+!20 = distinct !DIGlobalVariable(scope: null, file: !1, line: 18, type: !5, isLocal: true, isDefinition: true)
+!21 = !DIGlobalVariableExpression(var: !22, expr: !DIExpression())
+!22 = distinct !DIGlobalVariable(scope: null, file: !1, line: 20, type: !5, isLocal: true, isDefinition: true)
+!23 = !DIGlobalVariableExpression(var: !24, expr: !DIExpression())
+!24 = distinct !DIGlobalVariable(scope: null, file: !1, line: 22, type: !5, isLocal: true, isDefinition: true)
+!25 = !DIGlobalVariableExpression(var: !26, expr: !DIExpression())
+!26 = distinct !DIGlobalVariable(scope: null, file: !1, line: 24, type: !27, isLocal: true, isDefinition: true)
+!27 = !DICompositeType(tag: DW_TAG_array_type, baseType: !6, size: 32, elements: !28)
+!28 = !{!29}
+!29 = !DISubrange(count: 4)
+!30 = !DIGlobalVariableExpression(var: !31, expr: !DIExpression())
+!31 = distinct !DIGlobalVariable(scope: null, file: !1, line: 26, type: !27, isLocal: true, isDefinition: true)
+!32 = !DIGlobalVariableExpression(var: !33, expr: !DIExpression())
+!33 = distinct !DIGlobalVariable(scope: null, file: !1, line: 28, type: !27, isLocal: true, isDefinition: true)
+!34 = !{i32 7, !"Dwarf Version", i32 5}
+!35 = !{i32 2, !"Debug Info Version", i32 3}
+!36 = !{i32 1, !"wchar_size", i32 4}
+!37 = !{i32 8, !"PIC Level", i32 2}
+!38 = !{i32 7, !"PIE Level", i32 2}
+!39 = !{i32 7, !"uwtable", i32 2}
+!40 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
+!41 = !{!"clang version 18.0.0 (https://github.com/llvm/llvm-project.git 24cf476bd6d144b9fa28325b4d16e3c9dbfc4d4f)"}
+!42 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !43, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !46)
+!43 = !DISubroutineType(types: !44)
+!44 = !{null, !45}
+!45 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!46 = !{!47}
+!47 = !DILocalVariable(name: "cond", arg: 1, scope: !42, file: !1, line: 3, type: !45)
+!48 = !DILocation(line: 0, scope: !42)
+!49 = !DILocation(line: 4, column: 3, scope: !42)
+!50 = !DILocation(line: 6, column: 5, scope: !51)
+!51 = distinct !DILexicalBlock(scope: !42, file: !1, line: 4, column: 17)
+!52 = !DILocation(line: 8, column: 5, scope: !51)
+!53 = !DILocation(line: 10, column: 5, scope: !51)
+!54 = !DILocation(line: 12, column: 5, scope: !51)
+!55 = !DILocation(line: 14, column: 5, scope: !51)
+!56 = !DILocation(line: 16, column: 5, scope: !51)
+!57 = !DILocation(line: 18, column: 5, scope: !51)
+!58 = !DILocation(line: 20, column: 5, scope: !51)
+!59 = !DILocation(line: 22, column: 5, scope: !51)
+!60 = !DILocation(line: 24, column: 5, scope: !51)
+!61 = !DILocation(line: 26, column: 5, scope: !51)
+!62 = !DILocation(line: 28, column: 5, scope: !51)
+!63 = !DILocation(line: 30, column: 1, scope: !42)
>From 51608475a0d85007644b50b5a70db8ca692e85ed Mon Sep 17 00:00:00 2001
From: Haohai Wen <haohai.wen at intel.com>
Date: Thu, 2 Nov 2023 12:32:36 +0800
Subject: [PATCH 2/3] Add missing debug info for jump table BB
visitJumpTable is called on FinishBasicBlock. At that time, getCurSDLoc
will always return SDLoc without DebugLoc since CurInst was set to
nullptr after visiting each instruction.
This patch passes SDLoc to buildJumpTable when visiting SwitchInst so
that visitJumpTable can use it later.
---
llvm/include/llvm/CodeGen/SwitchLoweringUtils.h | 15 ++++++++++-----
llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp | 2 +-
.../CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 15 ++++++++-------
llvm/lib/CodeGen/SwitchLoweringUtils.cpp | 8 +++++---
.../DebugInfo/Generic/debug-info-jump-table.ll | 4 ++--
5 files changed, 26 insertions(+), 18 deletions(-)
diff --git a/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h b/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
index 189dfef590b0f9b..d91205b91ee4b4b 100644
--- a/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
+++ b/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
@@ -174,8 +174,13 @@ struct JumpTable {
/// check MBB. This is when updating PHI nodes in successors.
MachineBasicBlock *Default;
- JumpTable(unsigned R, unsigned J, MachineBasicBlock *M, MachineBasicBlock *D)
- : Reg(R), JTI(J), MBB(M), Default(D) {}
+ /// The debug location of the instruction this JumpTable was produced from.
+ std::optional<SDLoc> SL; // For SelectionDAG
+ DebugLoc DbgLoc; // For GISel
+
+ JumpTable(unsigned R, unsigned J, MachineBasicBlock *M, MachineBasicBlock *D,
+ std::optional<SDLoc> SL, DebugLoc DL)
+ : Reg(R), JTI(J), MBB(M), Default(D), SL(SL), DbgLoc(DL) {}
};
struct JumpTableHeader {
APInt First;
@@ -270,13 +275,13 @@ class SwitchLowering {
std::vector<BitTestBlock> BitTestCases;
void findJumpTables(CaseClusterVector &Clusters, const SwitchInst *SI,
- MachineBasicBlock *DefaultMBB,
+ std::optional<SDLoc> SL, MachineBasicBlock *DefaultMBB,
ProfileSummaryInfo *PSI, BlockFrequencyInfo *BFI);
bool buildJumpTable(const CaseClusterVector &Clusters, unsigned First,
unsigned Last, const SwitchInst *SI,
- MachineBasicBlock *DefaultMBB, CaseCluster &JTCluster);
-
+ std::optional<SDLoc> SL, MachineBasicBlock *DefaultMBB,
+ CaseCluster &JTCluster);
void findBitTestClusters(CaseClusterVector &Clusters, const SwitchInst *SI);
diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index d8f9e30b2599779..339fb73969c0d18 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -721,7 +721,7 @@ bool IRTranslator::translateSwitch(const User &U, MachineIRBuilder &MIB) {
return true;
}
- SL->findJumpTables(Clusters, &SI, DefaultMBB, nullptr, nullptr);
+ SL->findJumpTables(Clusters, &SI, std::nullopt, DefaultMBB, nullptr, nullptr);
SL->findBitTestClusters(Clusters, &SI);
LLVM_DEBUG({
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 29505f7505ba25c..1729e39f68cf4ef 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -2669,14 +2669,13 @@ void SelectionDAGBuilder::visitSwitchCase(CaseBlock &CB,
/// visitJumpTable - Emit JumpTable node in the current MBB
void SelectionDAGBuilder::visitJumpTable(SwitchCG::JumpTable &JT) {
// Emit the code for the jump table
+ assert(JT.SL && "Should set SDLoc for SelectionDAG!");
assert(JT.Reg != -1U && "Should lower JT Header first!");
EVT PTy = DAG.getTargetLoweringInfo().getPointerTy(DAG.getDataLayout());
- SDValue Index = DAG.getCopyFromReg(getControlRoot(), getCurSDLoc(),
- JT.Reg, PTy);
+ SDValue Index = DAG.getCopyFromReg(getControlRoot(), *JT.SL, JT.Reg, PTy);
SDValue Table = DAG.getJumpTable(JT.JTI, PTy);
- SDValue BrJumpTable = DAG.getNode(ISD::BR_JT, getCurSDLoc(),
- MVT::Other, Index.getValue(1),
- Table, Index);
+ SDValue BrJumpTable = DAG.getNode(ISD::BR_JT, *JT.SL, MVT::Other,
+ Index.getValue(1), Table, Index);
DAG.setRoot(BrJumpTable);
}
@@ -2685,7 +2684,8 @@ void SelectionDAGBuilder::visitJumpTable(SwitchCG::JumpTable &JT) {
void SelectionDAGBuilder::visitJumpTableHeader(SwitchCG::JumpTable &JT,
JumpTableHeader &JTH,
MachineBasicBlock *SwitchBB) {
- SDLoc dl = getCurSDLoc();
+ assert(JT.SL && "Should set SDLoc for SelectionDAG!");
+ const SDLoc &dl = *JT.SL;
// Subtract the lowest switch case value from the value being switched on.
SDValue SwitchOp = getValue(JTH.SValue);
@@ -11816,7 +11816,8 @@ void SelectionDAGBuilder::visitSwitch(const SwitchInst &SI) {
return;
}
- SL->findJumpTables(Clusters, &SI, DefaultMBB, DAG.getPSI(), DAG.getBFI());
+ SL->findJumpTables(Clusters, &SI, getCurSDLoc(), DefaultMBB, DAG.getPSI(),
+ DAG.getBFI());
SL->findBitTestClusters(Clusters, &SI);
LLVM_DEBUG({
diff --git a/llvm/lib/CodeGen/SwitchLoweringUtils.cpp b/llvm/lib/CodeGen/SwitchLoweringUtils.cpp
index b01a8bed0a394b6..a1295d1e9544b6b 100644
--- a/llvm/lib/CodeGen/SwitchLoweringUtils.cpp
+++ b/llvm/lib/CodeGen/SwitchLoweringUtils.cpp
@@ -45,6 +45,7 @@ SwitchCG::getJumpTableNumCases(const SmallVectorImpl<unsigned> &TotalCases,
void SwitchCG::SwitchLowering::findJumpTables(CaseClusterVector &Clusters,
const SwitchInst *SI,
+ std::optional<SDLoc> SL,
MachineBasicBlock *DefaultMBB,
ProfileSummaryInfo *PSI,
BlockFrequencyInfo *BFI) {
@@ -87,7 +88,7 @@ void SwitchCG::SwitchLowering::findJumpTables(CaseClusterVector &Clusters,
// Cheap case: the whole range may be suitable for jump table.
if (TLI->isSuitableForJumpTable(SI, NumCases, Range, PSI, BFI)) {
CaseCluster JTCluster;
- if (buildJumpTable(Clusters, 0, N - 1, SI, DefaultMBB, JTCluster)) {
+ if (buildJumpTable(Clusters, 0, N - 1, SI, SL, DefaultMBB, JTCluster)) {
Clusters[0] = JTCluster;
Clusters.resize(1);
return;
@@ -177,7 +178,7 @@ void SwitchCG::SwitchLowering::findJumpTables(CaseClusterVector &Clusters,
CaseCluster JTCluster;
if (NumClusters >= MinJumpTableEntries &&
- buildJumpTable(Clusters, First, Last, SI, DefaultMBB, JTCluster)) {
+ buildJumpTable(Clusters, First, Last, SI, SL, DefaultMBB, JTCluster)) {
Clusters[DstIndex++] = JTCluster;
} else {
for (unsigned I = First; I <= Last; ++I)
@@ -190,6 +191,7 @@ void SwitchCG::SwitchLowering::findJumpTables(CaseClusterVector &Clusters,
bool SwitchCG::SwitchLowering::buildJumpTable(const CaseClusterVector &Clusters,
unsigned First, unsigned Last,
const SwitchInst *SI,
+ std::optional<SDLoc> SL,
MachineBasicBlock *DefaultMBB,
CaseCluster &JTCluster) {
assert(First <= Last);
@@ -251,7 +253,7 @@ bool SwitchCG::SwitchLowering::buildJumpTable(const CaseClusterVector &Clusters,
->createJumpTableIndex(Table);
// Set up the jump table info.
- JumpTable JT(-1U, JTI, JumpTableMBB, nullptr);
+ JumpTable JT(-1U, JTI, JumpTableMBB, nullptr, SL, SI->getDebugLoc());
JumpTableHeader JTH(Clusters[First].Low->getValue(),
Clusters[Last].High->getValue(), SI->getCondition(),
nullptr, false);
diff --git a/llvm/test/DebugInfo/Generic/debug-info-jump-table.ll b/llvm/test/DebugInfo/Generic/debug-info-jump-table.ll
index b73d05441f654bb..4b155d162ec20c2 100644
--- a/llvm/test/DebugInfo/Generic/debug-info-jump-table.ll
+++ b/llvm/test/DebugInfo/Generic/debug-info-jump-table.ll
@@ -24,8 +24,8 @@ define dso_local void @foo(i32 noundef %cond) local_unnamed_addr #0 !dbg !42 {
;CHECK: Initial selection DAG: %bb.{{[0-9]+}} 'foo:entry'
;CHECK: SelectionDAG has 5 nodes:
;CHECK: [[TMP1:t.*]]: ch,glue = EntryToken
-;CHECK: [[TMP2:t.*]]: i64,ch = CopyFromReg [[TMP1]], Register:i64 %{{[0-9]+}}
-;CHECK: t{{[0-9]+}}: ch = br_jt [[TMP2]]:1, JumpTable:i64<0>, [[TMP2]]
+;CHECK: [[TMP2:t.*]]: i64,ch = CopyFromReg [[TMP1]], Register:i64 %{{[0-9]+}}, jump_table.c:4:3
+;CHECK: t{{[0-9]+}}: ch = br_jt [[TMP2]]:1, JumpTable:i64<0>, [[TMP2]], jump_table.c:4:3
entry:
call void @llvm.dbg.value(metadata i32 %cond, metadata !47, metadata !DIExpression()), !dbg !48
>From af0adc9d84849a07c15d7f7300e127b2db337d5f Mon Sep 17 00:00:00 2001
From: Haohai Wen <haohai.wen at intel.com>
Date: Thu, 2 Nov 2023 14:10:44 +0800
Subject: [PATCH 3/3] Use reference for buildJumpTable
---
llvm/include/llvm/CodeGen/SwitchLoweringUtils.h | 4 ++--
llvm/lib/CodeGen/SwitchLoweringUtils.cpp | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h b/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
index d91205b91ee4b4b..ed1adfd4fa3dd05 100644
--- a/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
+++ b/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
@@ -280,8 +280,8 @@ class SwitchLowering {
bool buildJumpTable(const CaseClusterVector &Clusters, unsigned First,
unsigned Last, const SwitchInst *SI,
- std::optional<SDLoc> SL, MachineBasicBlock *DefaultMBB,
- CaseCluster &JTCluster);
+ const std::optional<SDLoc> &SL,
+ MachineBasicBlock *DefaultMBB, CaseCluster &JTCluster);
void findBitTestClusters(CaseClusterVector &Clusters, const SwitchInst *SI);
diff --git a/llvm/lib/CodeGen/SwitchLoweringUtils.cpp b/llvm/lib/CodeGen/SwitchLoweringUtils.cpp
index a1295d1e9544b6b..c71117e27a102fd 100644
--- a/llvm/lib/CodeGen/SwitchLoweringUtils.cpp
+++ b/llvm/lib/CodeGen/SwitchLoweringUtils.cpp
@@ -191,7 +191,7 @@ void SwitchCG::SwitchLowering::findJumpTables(CaseClusterVector &Clusters,
bool SwitchCG::SwitchLowering::buildJumpTable(const CaseClusterVector &Clusters,
unsigned First, unsigned Last,
const SwitchInst *SI,
- std::optional<SDLoc> SL,
+ const std::optional<SDLoc> &SL,
MachineBasicBlock *DefaultMBB,
CaseCluster &JTCluster) {
assert(First <= Last);
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