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authorDimitry Andric <dim@FreeBSD.org>2017-02-23 19:02:03 +0000
committerDimitry Andric <dim@FreeBSD.org>2017-02-23 19:02:03 +0000
commite49737eb046479c0610f1254ef311a91036a5144 (patch)
tree0329bf538c7f7b280e5c880aeccd90070e8a3040
parentc60b95818e4f6c00c872114318d01109f97a7fa3 (diff)
downloadsrc-e49737eb046479c0610f1254ef311a91036a5144.tar.gz
src-e49737eb046479c0610f1254ef311a91036a5144.zip
Vendor import of llvm release_40 branch r295910:vendor/llvm/llvm-release_40-r295910
Notes
Notes: svn path=/vendor/llvm/dist/; revision=314159 svn path=/vendor/llvm/llvm-release_40-r295910/; revision=314160; tag=vendor/llvm/llvm-release_40-r295910
-rw-r--r--docs/ReleaseNotes.rst7
-rw-r--r--lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp13
-rw-r--r--lib/CodeGen/AsmPrinter/DwarfDebug.cpp9
-rw-r--r--lib/CodeGen/AsmPrinter/DwarfDebug.h58
-rw-r--r--lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp6
-rw-r--r--lib/Target/ARM/ARMExpandPseudoInsts.cpp34
-rw-r--r--lib/Transforms/Scalar/LICM.cpp3
-rw-r--r--test/CodeGen/AArch64/ldst-opt.mir26
-rw-r--r--test/CodeGen/ARM/aeabi-read-tp.ll26
-rw-r--r--test/DebugInfo/X86/FrameIndexExprs.ll85
10 files changed, 213 insertions, 54 deletions
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index da86be3f96ff..6efa4813d770 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -61,6 +61,13 @@ Non-comprehensive list of changes in this release
with LLVM option -adce-remove-loops when the loop body otherwise has
no live operations.
+* The GVNHoist pass is now enabled by default. The new pass based on Global
+ Value Numbering detects similar computations in branch code and replaces
+ multiple instances of the same computation with a unique expression. The
+ transform benefits code size and generates better schedules. GVNHoist is
+ more aggressive at -Os and -Oz, hoisting more expressions at the expense of
+ execution time degradations.
+
* The llvm-cov tool can now export coverage data as json. Its html output mode
has also improved.
diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 0db623bbc29a..d904372af589 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -522,22 +522,19 @@ DIE *DwarfCompileUnit::constructVariableDIEImpl(const DbgVariable &DV,
}
// .. else use frame index.
- if (DV.getFrameIndex().empty())
+ if (!DV.hasFrameIndexExprs())
return VariableDie;
- auto Expr = DV.getExpression().begin();
DIELoc *Loc = new (DIEValueAllocator) DIELoc;
DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
- for (auto FI : DV.getFrameIndex()) {
+ for (auto &Fragment : DV.getFrameIndexExprs()) {
unsigned FrameReg = 0;
const TargetFrameLowering *TFI = Asm->MF->getSubtarget().getFrameLowering();
- int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
- assert(Expr != DV.getExpression().end() && "Wrong number of expressions");
- DwarfExpr.addFragmentOffset(*Expr);
+ int Offset = TFI->getFrameIndexReference(*Asm->MF, Fragment.FI, FrameReg);
+ DwarfExpr.addFragmentOffset(Fragment.Expr);
DwarfExpr.AddMachineRegIndirect(*Asm->MF->getSubtarget().getRegisterInfo(),
FrameReg, Offset);
- DwarfExpr.AddExpression(*Expr);
- ++Expr;
+ DwarfExpr.AddExpression(Fragment.Expr);
}
addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index b465b98f368a..91a3d0989cc5 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -199,6 +199,15 @@ const DIType *DbgVariable::getType() const {
return Ty;
}
+ArrayRef<DbgVariable::FrameIndexExpr> DbgVariable::getFrameIndexExprs() const {
+ std::sort(FrameIndexExprs.begin(), FrameIndexExprs.end(),
+ [](const FrameIndexExpr &A, const FrameIndexExpr &B) -> bool {
+ return A.Expr->getFragmentInfo()->OffsetInBits <
+ B.Expr->getFragmentInfo()->OffsetInBits;
+ });
+ return FrameIndexExprs;
+}
+
static const DwarfAccelTable::Atom TypeAtoms[] = {
DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4),
DwarfAccelTable::Atom(dwarf::DW_ATOM_die_tag, dwarf::DW_FORM_data2),
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index e5bf33db81fb..253e3f06200e 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -54,7 +54,7 @@ class MachineModuleInfo;
///
/// Variables can be created from allocas, in which case they're generated from
/// the MMI table. Such variables can have multiple expressions and frame
-/// indices. The \a Expr and \a FrameIndices array must match.
+/// indices.
///
/// Variables can be created from \c DBG_VALUE instructions. Those whose
/// location changes over time use \a DebugLocListIndex, while those with a
@@ -64,11 +64,16 @@ class MachineModuleInfo;
class DbgVariable {
const DILocalVariable *Var; /// Variable Descriptor.
const DILocation *IA; /// Inlined at location.
- SmallVector<const DIExpression *, 1> Expr; /// Complex address.
DIE *TheDIE = nullptr; /// Variable DIE.
unsigned DebugLocListIndex = ~0u; /// Offset in DebugLocs.
const MachineInstr *MInsn = nullptr; /// DBG_VALUE instruction.
- SmallVector<int, 1> FrameIndex; /// Frame index.
+
+ struct FrameIndexExpr {
+ int FI;
+ const DIExpression *Expr;
+ };
+ mutable SmallVector<FrameIndexExpr, 1>
+ FrameIndexExprs; /// Frame index + expression.
public:
/// Construct a DbgVariable.
@@ -80,21 +85,18 @@ public:
/// Initialize from the MMI table.
void initializeMMI(const DIExpression *E, int FI) {
- assert(Expr.empty() && "Already initialized?");
- assert(FrameIndex.empty() && "Already initialized?");
+ assert(FrameIndexExprs.empty() && "Already initialized?");
assert(!MInsn && "Already initialized?");
assert((!E || E->isValid()) && "Expected valid expression");
assert(~FI && "Expected valid index");
- Expr.push_back(E);
- FrameIndex.push_back(FI);
+ FrameIndexExprs.push_back({FI, E});
}
/// Initialize from a DBG_VALUE instruction.
void initializeDbgValue(const MachineInstr *DbgValue) {
- assert(Expr.empty() && "Already initialized?");
- assert(FrameIndex.empty() && "Already initialized?");
+ assert(FrameIndexExprs.empty() && "Already initialized?");
assert(!MInsn && "Already initialized?");
assert(Var == DbgValue->getDebugVariable() && "Wrong variable");
@@ -103,16 +105,15 @@ public:
MInsn = DbgValue;
if (auto *E = DbgValue->getDebugExpression())
if (E->getNumElements())
- Expr.push_back(E);
+ FrameIndexExprs.push_back({0, E});
}
// Accessors.
const DILocalVariable *getVariable() const { return Var; }
const DILocation *getInlinedAt() const { return IA; }
- ArrayRef<const DIExpression *> getExpression() const { return Expr; }
const DIExpression *getSingleExpression() const {
- assert(MInsn && Expr.size() <= 1);
- return Expr.size() ? Expr[0] : nullptr;
+ assert(MInsn && FrameIndexExprs.size() <= 1);
+ return FrameIndexExprs.size() ? FrameIndexExprs[0].Expr : nullptr;
}
void setDIE(DIE &D) { TheDIE = &D; }
DIE *getDIE() const { return TheDIE; }
@@ -120,7 +121,9 @@ public:
unsigned getDebugLocListIndex() const { return DebugLocListIndex; }
StringRef getName() const { return Var->getName(); }
const MachineInstr *getMInsn() const { return MInsn; }
- ArrayRef<int> getFrameIndex() const { return FrameIndex; }
+ /// Get the FI entries, sorted by fragment offset.
+ ArrayRef<FrameIndexExpr> getFrameIndexExprs() const;
+ bool hasFrameIndexExprs() const { return !FrameIndexExprs.empty(); }
void addMMIEntry(const DbgVariable &V) {
assert(DebugLocListIndex == ~0U && !MInsn && "not an MMI entry");
@@ -128,16 +131,15 @@ public:
assert(V.Var == Var && "conflicting variable");
assert(V.IA == IA && "conflicting inlined-at location");
- assert(!FrameIndex.empty() && "Expected an MMI entry");
- assert(!V.FrameIndex.empty() && "Expected an MMI entry");
- assert(Expr.size() == FrameIndex.size() && "Mismatched expressions");
- assert(V.Expr.size() == V.FrameIndex.size() && "Mismatched expressions");
+ assert(!FrameIndexExprs.empty() && "Expected an MMI entry");
+ assert(!V.FrameIndexExprs.empty() && "Expected an MMI entry");
- Expr.append(V.Expr.begin(), V.Expr.end());
- FrameIndex.append(V.FrameIndex.begin(), V.FrameIndex.end());
- assert(all_of(Expr, [](const DIExpression *E) {
- return E && E->isFragment();
- }) && "conflicting locations for variable");
+ FrameIndexExprs.append(V.FrameIndexExprs.begin(), V.FrameIndexExprs.end());
+ assert(all_of(FrameIndexExprs,
+ [](FrameIndexExpr &FIE) {
+ return FIE.Expr && FIE.Expr->isFragment();
+ }) &&
+ "conflicting locations for variable");
}
// Translate tag to proper Dwarf tag.
@@ -167,11 +169,11 @@ public:
bool hasComplexAddress() const {
assert(MInsn && "Expected DBG_VALUE, not MMI variable");
- assert(FrameIndex.empty() && "Expected DBG_VALUE, not MMI variable");
- assert(
- (Expr.empty() || (Expr.size() == 1 && Expr.back()->getNumElements())) &&
- "Invalid Expr for DBG_VALUE");
- return !Expr.empty();
+ assert((FrameIndexExprs.empty() ||
+ (FrameIndexExprs.size() == 1 &&
+ FrameIndexExprs[0].Expr->getNumElements())) &&
+ "Invalid Expr for DBG_VALUE");
+ return !FrameIndexExprs.empty();
}
bool isBlockByrefVariable() const;
const DIType *getType() const;
diff --git a/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp b/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
index a2887aa81895..8e312dcf276f 100644
--- a/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
+++ b/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
@@ -853,9 +853,11 @@ AArch64LoadStoreOpt::promoteLoadFromStore(MachineBasicBlock::iterator LoadI,
.addImm(Imms);
}
}
- StoreI->clearRegisterKills(StRt, TRI);
- (void)BitExtMI;
+ // Clear kill flags between store and load.
+ for (MachineInstr &MI : make_range(StoreI->getIterator(),
+ BitExtMI->getIterator()))
+ MI.clearRegisterKills(StRt, TRI);
DEBUG(dbgs() << "Promoting load by replacing :\n ");
DEBUG(StoreI->print(dbgs()));
diff --git a/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index 95fcc8dcb453..baa4e0330cf4 100644
--- a/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -1225,16 +1225,36 @@ bool ARMExpandPseudo::ExpandMI(MachineBasicBlock &MBB,
}
case ARM::tTPsoft:
case ARM::TPsoft: {
+ const bool Thumb = Opcode == ARM::tTPsoft;
+
MachineInstrBuilder MIB;
- if (Opcode == ARM::tTPsoft)
+ if (STI->genLongCalls()) {
+ MachineFunction *MF = MBB.getParent();
+ MachineConstantPool *MCP = MF->getConstantPool();
+ unsigned PCLabelID = AFI->createPICLabelUId();
+ MachineConstantPoolValue *CPV =
+ ARMConstantPoolSymbol::Create(MF->getFunction()->getContext(),
+ "__aeabi_read_tp", PCLabelID, 0);
+ unsigned Reg = MI.getOperand(0).getReg();
MIB = BuildMI(MBB, MBBI, MI.getDebugLoc(),
- TII->get( ARM::tBL))
- .addImm((unsigned)ARMCC::AL).addReg(0)
- .addExternalSymbol("__aeabi_read_tp", 0);
- else
+ TII->get(Thumb ? ARM::tLDRpci : ARM::LDRi12), Reg)
+ .addConstantPoolIndex(MCP->getConstantPoolIndex(CPV, 4));
+ if (!Thumb)
+ MIB.addImm(0);
+ MIB.addImm(static_cast<unsigned>(ARMCC::AL)).addReg(0);
+
MIB = BuildMI(MBB, MBBI, MI.getDebugLoc(),
- TII->get( ARM::BL))
- .addExternalSymbol("__aeabi_read_tp", 0);
+ TII->get(Thumb ? ARM::tBLXr : ARM::BLX));
+ if (Thumb)
+ MIB.addImm(static_cast<unsigned>(ARMCC::AL)).addReg(0);
+ MIB.addReg(Reg, RegState::Kill);
+ } else {
+ MIB = BuildMI(MBB, MBBI, MI.getDebugLoc(),
+ TII->get(Thumb ? ARM::tBL : ARM::BL));
+ if (Thumb)
+ MIB.addImm(static_cast<unsigned>(ARMCC::AL)).addReg(0);
+ MIB.addExternalSymbol("__aeabi_read_tp", 0);
+ }
MIB->setMemRefs(MI.memoperands_begin(), MI.memoperands_end());
TransferImpOps(MI, MIB, MIB);
diff --git a/lib/Transforms/Scalar/LICM.cpp b/lib/Transforms/Scalar/LICM.cpp
index 4c15c8a32bec..f51d11c04cb2 100644
--- a/lib/Transforms/Scalar/LICM.cpp
+++ b/lib/Transforms/Scalar/LICM.cpp
@@ -1196,10 +1196,7 @@ LoopInvariantCodeMotion::collectAliasInfoForLoop(Loop *L, LoopInfo *LI,
auto mergeLoop = [&](Loop *L) {
// Loop over the body of this loop, looking for calls, invokes, and stores.
- // Because subloops have already been incorporated into AST, we skip blocks
- // in subloops.
for (BasicBlock *BB : L->blocks())
- if (LI->getLoopFor(BB) == L) // Ignore blocks in subloops.
CurAST->add(*BB); // Incorporate the specified basic block
};
diff --git a/test/CodeGen/AArch64/ldst-opt.mir b/test/CodeGen/AArch64/ldst-opt.mir
index 8f0b71be3483..85b655b717ca 100644
--- a/test/CodeGen/AArch64/ldst-opt.mir
+++ b/test/CodeGen/AArch64/ldst-opt.mir
@@ -1,10 +1,4 @@
# RUN: llc -mtriple=aarch64--linux-gnu -run-pass=aarch64-ldst-opt %s -verify-machineinstrs -o - 2>&1 | FileCheck %s
---- |
- define void @promote-load-from-store() { ret void }
- define void @store-pair() { ret void }
- define void @store-pair-clearkill0() { ret void }
- define void @store-pair-clearkill1() { ret void }
-...
---
name: promote-load-from-store
tracksRegLiveness: true
@@ -130,3 +124,23 @@ body: |
# CHECK-NOT: %w2 = COPY killed %w1
# CHECK: %w2 = COPY %w1
# CHECK: STPWi %w1, killed %w2, killed %x0, 0
+---
+name: store-load-clearkill
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: %w1
+
+ STRWui %w1, %sp, 0 :: (store 4)
+ %wzr = COPY killed %w1 ; killing use of %w1
+ %w11 = LDRWui %sp, 0 :: (load 4)
+ HINT 0, implicit %w11 ; some use of %w11
+...
+# When replaceing the load of a store-load pair with a copy the kill flags
+# along the way need to be cleared.
+# CHECK-LABEL: name: store-load-clearkill
+# CHECK: STRWui %w1, %sp, 0 :: (store 4)
+# CHECK-NOT: COPY killed %w1
+# CHECK: %wzr = COPY %w1
+# CHECK: %w11 = ORRWrs %wzr, %w1, 0
+# CHECK: HINT 0, implicit %w11
diff --git a/test/CodeGen/ARM/aeabi-read-tp.ll b/test/CodeGen/ARM/aeabi-read-tp.ll
new file mode 100644
index 000000000000..5f9815b6cd77
--- /dev/null
+++ b/test/CodeGen/ARM/aeabi-read-tp.ll
@@ -0,0 +1,26 @@
+; RUN: llc -mtriple armv7---eabi -filetype asm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-SHORT
+; RUN: llc -mtriple thumbv7---eabi -filetype asm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-SHORT
+; RUN: llc -mtriple armv7---eabi -mattr=+long-calls -filetype asm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-LONG
+; RUN: llc -mtriple thumbv7---eabi -mattr=+long-calls -filetype asm -o - %s | FileCheck %s -check-prefix CHECK -check-prefix CHECK-LONG
+
+@i = thread_local local_unnamed_addr global i32 0, align 4
+
+define i32 @f() local_unnamed_addr {
+entry:
+ %0 = load i32, i32* @i, align 4
+ ret i32 %0
+}
+
+; CHECK-LABEL: f:
+; CHECK-SHORT: ldr r1, [[VAR:.LCPI[0-9]+_[0-9]+]]
+; CHECK-SHORT-NEXT: bl __aeabi_read_tp
+; CHECK-SHORT: [[VAR]]:
+; CHECK-SHORT-NEXT: .long i(TPOFF)
+
+; CHECK-LONG: ldr [[REG:r[0-9]+]], [[FUN:.LCPI[0-9]+_[0-9]+]]
+; CHECK-LONG-NEXT: ldr r1, [[VAR:.LCPI[0-9]+_[0-9]+]]
+; CHECK-LONG-NEXT: blx [[REG]]
+; CHECK-LONG: [[VAR]]:
+; CHECK-LONG-NEXT: .long i(TPOFF)
+; CHECK-LONG: [[FUN]]:
+; CHECK-LONG-NEXT: .long __aeabi_read_tp
diff --git a/test/DebugInfo/X86/FrameIndexExprs.ll b/test/DebugInfo/X86/FrameIndexExprs.ll
new file mode 100644
index 000000000000..8b2cefc4f8f8
--- /dev/null
+++ b/test/DebugInfo/X86/FrameIndexExprs.ll
@@ -0,0 +1,85 @@
+; PR31381: An assertion in the DWARF backend when fragments in MMI slots are
+; sorted by largest offset first.
+; RUN: llc -mtriple=x86_64-apple-darwin -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
+; CHECK: DW_TAG_formal_parameter
+; CHECK: DW_TAG_formal_parameter
+; CHECK-NEXT: DW_AT_location [DW_FORM_exprloc] (<0xa> 91 78 93 03 93 06 91 7d 93 03 )
+; fbreg -8, piece 0x00000003, piece 0x00000006, fbreg -3, piece 0x00000003
+; CHECK-NEXT: DW_AT_abstract_origin {{.*}}"p"
+source_filename = "bugpoint-reduced-simplified.ll"
+target triple = "x86_64-apple-darwin"
+
+@f = common local_unnamed_addr global i32 0, align 4, !dbg !0
+@h = common local_unnamed_addr global i32 0, align 4, !dbg !6
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
+
+define void @fn4() local_unnamed_addr !dbg !12 {
+entry:
+ %l1.sroa.7.i = alloca [3 x i8], align 1
+ tail call void @llvm.dbg.declare(metadata [3 x i8]* %l1.sroa.7.i, metadata !15, metadata !26), !dbg !27
+ %i.sroa.4.i = alloca [3 x i8], align 8
+ tail call void @llvm.dbg.declare(metadata [3 x i8]* %i.sroa.4.i, metadata !15, metadata !32), !dbg !27
+ %0 = load i32, i32* @h, align 4
+ br label %while.body.i.i, !dbg !33
+
+while.body.i.i: ; preds = %while.body.i.i, %entry
+ br label %while.body.i.i, !dbg !34
+
+fn3.exit: ; No predecessors!
+ %1 = load i32, i32* @f, align 4
+ %tobool.i = icmp eq i32 %1, 0
+ br label %while.body.i
+
+while.body.i: ; preds = %if.end.i, %fn3.exit
+ br i1 %tobool.i, label %if.end.i, label %if.then.i
+
+if.then.i: ; preds = %while.body.i
+ br label %if.end.i
+
+if.end.i: ; preds = %if.then.i, %while.body.i
+ br label %while.body.i
+}
+
+attributes #0 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!9, !10, !11}
+
+!0 = !DIGlobalVariableExpression(var: !1)
+!1 = distinct !DIGlobalVariable(name: "f", scope: !2, file: !3, line: 8, type: !8, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
+!3 = !DIFile(filename: "PR31381.c", directory: "/")
+!4 = !{}
+!5 = !{!0, !6}
+!6 = !DIGlobalVariableExpression(var: !7)
+!7 = distinct !DIGlobalVariable(name: "h", scope: !2, file: !3, line: 8, type: !8, isLocal: false, isDefinition: true)
+!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!9 = !{i32 2, !"Dwarf Version", i32 4}
+!10 = !{i32 2, !"Debug Info Version", i32 3}
+!11 = !{i32 1, !"PIC Level", i32 2}
+!12 = distinct !DISubprogram(name: "fn4", scope: !3, file: !3, line: 31, type: !13, isLocal: false, isDefinition: true, scopeLine: 32, isOptimized: true, unit: !2, variables: !4)
+!13 = !DISubroutineType(types: !14)
+!14 = !{null}
+!15 = !DILocalVariable(name: "p", arg: 1, scope: !16, file: !3, line: 19, type: !19)
+!16 = distinct !DISubprogram(name: "fn2", scope: !3, file: !3, line: 19, type: !17, isLocal: false, isDefinition: true, scopeLine: 20, flags: DIFlagPrototyped, isOptimized: true, unit: !2, variables: !25)
+!17 = !DISubroutineType(types: !18)
+!18 = !{null, !19}
+!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !3, line: 1, size: 96, elements: !20)
+!20 = !{!21, !23, !24}
+!21 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !19, file: !3, line: 4, baseType: !22, size: 8, offset: 24)
+!22 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!23 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !19, file: !3, line: 5, baseType: !8, size: 32, offset: 32)
+!24 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !19, file: !3, line: 6, baseType: !8, size: 6, offset: 64, flags: DIFlagBitField, extraData: i64 64)
+!25 = !{!15}
+!26 = !DIExpression(DW_OP_LLVM_fragment, 72, 24)
+!27 = !DILocation(line: 19, column: 20, scope: !16, inlinedAt: !28)
+!28 = distinct !DILocation(line: 27, column: 3, scope: !29, inlinedAt: !30)
+!29 = distinct !DISubprogram(name: "fn3", scope: !3, file: !3, line: 24, type: !13, isLocal: false, isDefinition: true, scopeLine: 25, isOptimized: true, unit: !2, variables: !4)
+!30 = distinct !DILocation(line: 34, column: 7, scope: !31)
+!31 = distinct !DILexicalBlock(scope: !12, file: !3, line: 33, column: 5)
+!32 = !DIExpression(DW_OP_LLVM_fragment, 0, 24)
+!33 = !DILocation(line: 22, column: 9, scope: !16, inlinedAt: !28)
+!34 = !DILocation(line: 21, column: 3, scope: !35, inlinedAt: !28)
+!35 = !DILexicalBlockFile(scope: !16, file: !3, discriminator: 2)