[llvm] r282611 - Teach LiveDebugValues about lexical scopes.
Adrian Prantl via llvm-commits
llvm-commits at lists.llvm.org
Wed Sep 28 10:51:15 PDT 2016
Author: adrian
Date: Wed Sep 28 12:51:14 2016
New Revision: 282611
URL: http://llvm.org/viewvc/llvm-project?rev=282611&view=rev
Log:
Teach LiveDebugValues about lexical scopes.
This addresses PR26055 LiveDebugValues is very slow.
Contrary to the old LiveDebugVariables pass LiveDebugValues currently
doesn't look at the lexical scopes before inserting a DBG_VALUE
intrinsic. This means that we often propagate DBG_VALUEs much further
down than necessary. This is especially noticeable in large C++
functions with many inlined method calls that all use the same
"this"-pointer.
For example, in the following code it makes no sense to propagate the
inlined variable a from the first inlined call to f() into any of the
subsequent basic blocks, because the variable will always be out of
scope:
void sink(int a);
void __attribute((always_inline)) f(int a) { sink(a); }
void foo(int i) {
f(i);
if (i)
f(i);
f(i);
}
This patch reuses the LexicalScopes infrastructure we have for
LiveDebugVariables to take this into account.
The effect on compile time and memory consumption is quite noticeable:
I tested a benchmark that is a large C++ source with an enormous
amount of inlined "this"-pointers that would previously eat >24GiB
(most of them for DBG_VALUE intrinsics) and whose compile time was
dominated by LiveDebugValues. With this patch applied the memory
consumption is 1GiB and 1.7% of the time is spent in LiveDebugValues.
https://reviews.llvm.org/D24994
Thanks to Daniel Berlin and Keith Walker for reviewing!
Added:
llvm/trunk/test/DebugInfo/MIR/X86/livedebugvalues-limit.mir
Modified:
llvm/trunk/lib/CodeGen/LiveDebugValues.cpp
llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir
llvm/trunk/test/DebugInfo/COFF/register-variables.ll
llvm/trunk/test/DebugInfo/X86/fission-ranges.ll
Modified: llvm/trunk/lib/CodeGen/LiveDebugValues.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveDebugValues.cpp?rev=282611&r1=282610&r2=282611&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveDebugValues.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveDebugValues.cpp Wed Sep 28 12:51:14 2016
@@ -23,6 +23,7 @@
#include "llvm/ADT/SparseBitVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/UniqueVector.h"
+#include "llvm/CodeGen/LexicalScopes.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
@@ -60,6 +61,26 @@ class LiveDebugValues : public MachineFu
private:
const TargetRegisterInfo *TRI;
const TargetInstrInfo *TII;
+ LexicalScopes LS;
+
+ /// Keeps track of lexical scopes associated with a user value's source
+ /// location.
+ class UserValueScopes {
+ DebugLoc DL;
+ LexicalScopes &LS;
+ SmallPtrSet<const MachineBasicBlock *, 4> LBlocks;
+
+ public:
+ UserValueScopes(DebugLoc D, LexicalScopes &L) : DL(std::move(D)), LS(L) {}
+
+ /// Return true if current scope dominates at least one machine
+ /// instruction in a given machine basic block.
+ bool dominates(MachineBasicBlock *MBB) {
+ if (LBlocks.empty())
+ LS.getMachineBasicBlocks(DL, LBlocks);
+ return LBlocks.count(MBB) != 0 || LS.dominates(DL, MBB);
+ }
+ };
/// Based on std::pair so it can be used as an index into a DenseMap.
typedef std::pair<const DILocalVariable *, const DILocation *>
@@ -83,7 +104,7 @@ private:
struct VarLoc {
const DebugVariable Var;
const MachineInstr &MI; ///< Only used for cloning a new DBG_VALUE.
-
+ mutable UserValueScopes UVS;
enum { InvalidKind = 0, RegisterKind } Kind;
/// The value location. Stored separately to avoid repeatedly
@@ -96,9 +117,9 @@ private:
uint64_t Hash;
} Loc;
- VarLoc(const MachineInstr &MI)
+ VarLoc(const MachineInstr &MI, LexicalScopes &LS)
: Var(MI.getDebugVariable(), MI.getDebugLoc()->getInlinedAt()), MI(MI),
- Kind(InvalidKind) {
+ UVS(MI.getDebugLoc(), LS), Kind(InvalidKind) {
static_assert((sizeof(Loc) == sizeof(uint64_t)),
"hash does not cover all members of Loc");
assert(MI.isDebugValue() && "not a DBG_VALUE");
@@ -125,6 +146,10 @@ private:
return 0;
}
+ /// Determine whether the lexical scope of this value's debug location
+ /// dominates MBB.
+ bool dominates(MachineBasicBlock &MBB) const { return UVS.dominates(&MBB); }
+
void dump() const { MI.dump(); }
bool operator==(const VarLoc &Other) const {
@@ -229,6 +254,7 @@ public:
/// Calculate the liveness information for the given machine function.
bool runOnMachineFunction(MachineFunction &MF) override;
};
+
} // namespace
//===----------------------------------------------------------------------===//
@@ -295,7 +321,7 @@ void LiveDebugValues::transferDebugValue
// Add the VarLoc to OpenRanges from this DBG_VALUE.
// TODO: Currently handles DBG_VALUE which has only reg as location.
if (isDbgValueDescribedByReg(MI)) {
- VarLoc VL(MI);
+ VarLoc VL(MI, LS);
unsigned ID = VarLocIDs.insert(VL);
OpenRanges.insert(ID, VL.Var);
}
@@ -399,6 +425,13 @@ bool LiveDebugValues::join(MachineBasicB
NumVisited++;
}
+ // Filter out DBG_VALUES that are out of scope.
+ VarLocSet KillSet;
+ for (auto ID : InLocsT)
+ if (!VarLocIDs[ID].dominates(MBB))
+ KillSet.set(ID);
+ InLocsT.intersectWithComplement(KillSet);
+
// As we are processing blocks in reverse post-order we
// should have processed at least one predecessor, unless it
// is the entry block which has no predecessor.
@@ -520,12 +553,14 @@ bool LiveDebugValues::ExtendRanges(Machi
}
bool LiveDebugValues::runOnMachineFunction(MachineFunction &MF) {
+ if (!MF.getFunction()->getSubprogram())
+ // LiveDebugValues will already have removed all DBG_VALUEs.
+ return false;
+
TRI = MF.getSubtarget().getRegisterInfo();
TII = MF.getSubtarget().getInstrInfo();
+ LS.initialize(MF);
- bool Changed = false;
-
- Changed |= ExtendRanges(MF);
-
+ bool Changed = ExtendRanges(MF);
return Changed;
}
Modified: llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir?rev=282611&r1=282610&r2=282611&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir (original)
+++ llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir Wed Sep 28 12:51:14 2016
@@ -47,7 +47,6 @@
# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
# CHECK: bb.4.for.cond.cleanup
-# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use _, [[VAR_C]]
# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
Modified: llvm/trunk/test/DebugInfo/COFF/register-variables.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/COFF/register-variables.ll?rev=282611&r1=282610&r2=282611&view=diff
==============================================================================
--- llvm/trunk/test/DebugInfo/COFF/register-variables.ll (original)
+++ llvm/trunk/test/DebugInfo/COFF/register-variables.ll Wed Sep 28 12:51:14 2016
@@ -37,8 +37,8 @@
; ASM: #DEBUG_VALUE: c <- %EAX
; ASM: testl %esi, %esi
; ASM: je .LBB0_2
+; ASM: [[after_je:\.Ltmp.*]]:
; ASM: # BB#1: # %if.then
-; ASM-DAG: #DEBUG_VALUE: c <- %EAX
; ASM-DAG: #DEBUG_VALUE: inlineinc:a <- %EAX
; ASM-DAG: #DEBUG_VALUE: a <- %EAX
; ASM-DAG: #DEBUG_VALUE: f:p <- %ESI
@@ -65,7 +65,7 @@
; ASM: .cv_def_range [[after_getint]] [[after_inc_eax]], "A\021\021\000\000\000"
; ASM: .short 4414 # Record kind: S_LOCAL
; ASM: .asciz "c"
-; ASM: .cv_def_range [[after_getint]] [[after_inc_eax]], "A\021\021\000\000\000"
+; ASM: .cv_def_range [[after_getint]] [[after_je]], "A\021\021\000\000\000"
; ASM: .short 4414 # Record kind: S_LOCAL
; ASM: .asciz "b"
; ASM: .cv_def_range [[after_inc_eax]] [[after_if]], "A\021\021\000\000\000"
@@ -132,7 +132,7 @@
; OBJ: LocalVariableAddrRange {
; OBJ: OffsetStart: .text+0xC
; OBJ: ISectStart: 0x0
-; OBJ: Range: 0x6
+; OBJ: Range: 0x4
; OBJ: }
; OBJ: }
; OBJ: Local {
@@ -143,7 +143,7 @@
; OBJ: }
; OBJ: DefRangeRegister {
; OBJ: Register: 17
-; OBJ: LocalVariableAddrRange {
+; OBJ: MayHaveNoName: 0
; OBJ: OffsetStart: .text+0x12
; OBJ: ISectStart: 0x0
; OBJ: Range: 0x6
Added: llvm/trunk/test/DebugInfo/MIR/X86/livedebugvalues-limit.mir
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/MIR/X86/livedebugvalues-limit.mir?rev=282611&view=auto
==============================================================================
--- llvm/trunk/test/DebugInfo/MIR/X86/livedebugvalues-limit.mir (added)
+++ llvm/trunk/test/DebugInfo/MIR/X86/livedebugvalues-limit.mir Wed Sep 28 12:51:14 2016
@@ -0,0 +1,228 @@
+--- |
+ ; RUN: llc -run-pass=livedebugvalues -march=x86-64 -o - %s | FileCheck %s
+ ; Created from:
+ ; void sink(int a);
+ ; void __attribute((always_inline)) f(int a) { sink(a); }
+ ; void foo(int i) {
+ ; f(i);
+ ; if (i)
+ ; f(i);
+ ; f(i);
+ ; }
+ ;
+ ; This test verifies that LiveDebugValues doesn't propagate DBG_VALUEs into
+ ; basic blocks that are beyond the scope of the source variable.
+ ;
+ ; CHECK: bb.1.if.then:
+ ; CHECK: DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
+ ; CHECK-NOT: DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !21
+ ; CHECK: DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !27
+ ; CHECK: bb.2.if.end:
+ ; CHECK: DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
+ ; CHECK-NOT: DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !21
+ ; CHECK: DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !31
+ ;
+ ; ModuleID = 'livedebugvalues-limit.ll'
+ source_filename = "livedebugvalues-limit.c"
+ target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+ target triple = "x86_64-apple-macosx"
+
+ ; Function Attrs: alwaysinline nounwind ssp uwtable
+ define void @f(i32 %a) local_unnamed_addr #0 !dbg !7 {
+ entry:
+ tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !12, metadata !13), !dbg !14
+ tail call void @sink(i32 %a) #4, !dbg !15
+ ret void, !dbg !16
+ }
+
+ declare void @sink(i32) local_unnamed_addr
+
+ ; Function Attrs: nounwind ssp uwtable
+ define void @foo(i32 %i) local_unnamed_addr #2 !dbg !17 {
+ entry:
+ tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !19, metadata !13), !dbg !20
+ tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !12, metadata !13) #4, !dbg !21
+ tail call void @sink(i32 %i) #4, !dbg !23
+ %tobool = icmp eq i32 %i, 0, !dbg !24
+ br i1 %tobool, label %if.end, label %if.then, !dbg !26
+
+ if.then: ; preds = %entry
+ tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !12, metadata !13) #4, !dbg !27
+ tail call void @sink(i32 %i) #4, !dbg !29
+ br label %if.end, !dbg !30
+
+ if.end: ; preds = %if.then, %entry
+ tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !12, metadata !13) #4, !dbg !31
+ tail call void @sink(i32 %i) #4, !dbg !33
+ ret void, !dbg !34
+ }
+
+ ; Function Attrs: nounwind readnone
+ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3
+
+ ; Function Attrs: nounwind
+ declare void @llvm.stackprotector(i8*, i8**) #4
+
+ attributes #0 = { alwaysinline nounwind ssp uwtable }
+ attributes #2 = { nounwind ssp uwtable }
+ attributes #3 = { nounwind readnone }
+ attributes #4 = { nounwind }
+
+ !llvm.dbg.cu = !{!0}
+ !llvm.module.flags = !{!3, !4, !5}
+ !llvm.ident = !{!6}
+
+ !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 281923) (llvm/trunk 281916)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+ !1 = !DIFile(filename: "livedebugvalues-limit.c", directory: "/Volumes/Fusion/Data/llvm")
+ !2 = !{}
+ !3 = !{i32 2, !"Dwarf Version", i32 4}
+ !4 = !{i32 2, !"Debug Info Version", i32 3}
+ !5 = !{i32 1, !"PIC Level", i32 2}
+ !6 = !{!"clang version 4.0.0 (trunk 281923) (llvm/trunk 281916)"}
+ !7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !11)
+ !8 = !DISubroutineType(types: !9)
+ !9 = !{null, !10}
+ !10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+ !11 = !{!12}
+ !12 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 3, type: !10)
+ !13 = !DIExpression()
+ !14 = !DILocation(line: 3, column: 41, scope: !7)
+ !15 = !DILocation(line: 3, column: 46, scope: !7)
+ !16 = !DILocation(line: 3, column: 55, scope: !7)
+ !17 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 4, type: !8, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !18)
+ !18 = !{!19}
+ !19 = !DILocalVariable(name: "i", arg: 1, scope: !17, file: !1, line: 4, type: !10)
+ !20 = !DILocation(line: 4, column: 14, scope: !17)
+ !21 = !DILocation(line: 3, column: 41, scope: !7, inlinedAt: !22)
+ !22 = distinct !DILocation(line: 5, column: 3, scope: !17)
+ !23 = !DILocation(line: 3, column: 46, scope: !7, inlinedAt: !22)
+ !24 = !DILocation(line: 6, column: 7, scope: !25)
+ !25 = distinct !DILexicalBlock(scope: !17, file: !1, line: 6, column: 7)
+ !26 = !DILocation(line: 6, column: 7, scope: !17)
+ !27 = !DILocation(line: 3, column: 41, scope: !7, inlinedAt: !28)
+ !28 = distinct !DILocation(line: 7, column: 5, scope: !25)
+ !29 = !DILocation(line: 3, column: 46, scope: !7, inlinedAt: !28)
+ !30 = !DILocation(line: 7, column: 5, scope: !25)
+ !31 = !DILocation(line: 3, column: 41, scope: !7, inlinedAt: !32)
+ !32 = distinct !DILocation(line: 8, column: 3, scope: !17)
+ !33 = !DILocation(line: 3, column: 46, scope: !7, inlinedAt: !32)
+ !34 = !DILocation(line: 9, column: 1, scope: !17)
+
+...
+---
+name: f
+alignment: 4
+exposesReturnsTwice: false
+legalized: false
+regBankSelected: false
+selected: false
+tracksRegLiveness: true
+liveins:
+ - { reg: '%edi' }
+calleeSavedRegisters: [ '%bh', '%bl', '%bp', '%bpl', '%bx', '%ebp', '%ebx',
+ '%rbp', '%rbx', '%r12', '%r13', '%r14', '%r15',
+ '%r12b', '%r13b', '%r14b', '%r15b', '%r12d', '%r13d',
+ '%r14d', '%r15d', '%r12w', '%r13w', '%r14w', '%r15w' ]
+frameInfo:
+ isFrameAddressTaken: false
+ isReturnAddressTaken: false
+ hasStackMap: false
+ hasPatchPoint: false
+ stackSize: 8
+ offsetAdjustment: 0
+ maxAlignment: 0
+ adjustsStack: false
+ hasCalls: false
+ maxCallFrameSize: 0
+ hasOpaqueSPAdjustment: false
+ hasVAStart: false
+ hasMustTailInVarArgFunc: false
+fixedStack:
+ - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16 }
+body: |
+ bb.0.entry:
+ liveins: %edi, %rbp
+
+ frame-setup PUSH64r killed %rbp, implicit-def %rsp, implicit %rsp
+ CFI_INSTRUCTION def_cfa_offset 16
+ CFI_INSTRUCTION offset %rbp, -16
+ %rbp = frame-setup MOV64rr %rsp
+ CFI_INSTRUCTION def_cfa_register %rbp
+ DBG_VALUE debug-use %edi, debug-use _, !12, !13, debug-location !14
+ %rbp = POP64r implicit-def %rsp, implicit %rsp, debug-location !15
+ TAILJMPd64 @sink, csr_64, implicit %rsp, implicit %rsp, implicit %edi, debug-location !15
+
+...
+---
+name: foo
+alignment: 4
+exposesReturnsTwice: false
+legalized: false
+regBankSelected: false
+selected: false
+tracksRegLiveness: true
+liveins:
+ - { reg: '%edi' }
+calleeSavedRegisters: [ '%bh', '%bl', '%bp', '%bpl', '%bx', '%ebp', '%ebx',
+ '%rbp', '%rbx', '%r12', '%r13', '%r14', '%r15',
+ '%r12b', '%r13b', '%r14b', '%r15b', '%r12d', '%r13d',
+ '%r14d', '%r15d', '%r12w', '%r13w', '%r14w', '%r15w' ]
+frameInfo:
+ isFrameAddressTaken: false
+ isReturnAddressTaken: false
+ hasStackMap: false
+ hasPatchPoint: false
+ stackSize: 24
+ offsetAdjustment: -8
+ maxAlignment: 0
+ adjustsStack: true
+ hasCalls: true
+ maxCallFrameSize: 0
+ hasOpaqueSPAdjustment: false
+ hasVAStart: false
+ hasMustTailInVarArgFunc: false
+fixedStack:
+ - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '%rbx' }
+ - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16 }
+body: |
+ bb.0.entry:
+ successors: %bb.2.if.end, %bb.1.if.then
+ liveins: %edi, %rbx, %rbp
+
+ frame-setup PUSH64r killed %rbp, implicit-def %rsp, implicit %rsp
+ CFI_INSTRUCTION def_cfa_offset 16
+ CFI_INSTRUCTION offset %rbp, -16
+ %rbp = frame-setup MOV64rr %rsp
+ CFI_INSTRUCTION def_cfa_register %rbp
+ frame-setup PUSH64r killed %rbx, implicit-def %rsp, implicit %rsp
+ frame-setup PUSH64r undef %rax, implicit-def %rsp, implicit %rsp
+ CFI_INSTRUCTION offset %rbx, -24
+ DBG_VALUE debug-use %edi, debug-use _, !19, !13, debug-location !20
+ %ebx = MOV32rr %edi
+ DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !21
+ DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
+ CALL64pcrel32 @sink, csr_64, implicit %rsp, implicit %edi, implicit-def %rsp, debug-location !23
+ TEST32rr %ebx, %ebx, implicit-def %eflags, debug-location !24
+ JE_1 %bb.2.if.end, implicit %eflags
+
+ bb.1.if.then:
+ successors: %bb.2.if.end
+ liveins: %ebx, %rbp
+
+ DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
+ DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !27
+ %edi = MOV32rr %ebx, debug-location !29
+ CALL64pcrel32 @sink, csr_64, implicit %rsp, implicit %edi, implicit-def %rsp, debug-location !29
+
+ bb.2.if.end:
+ liveins: %ebx, %rbp
+
+ DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
+ %edi = MOV32rr killed %ebx, debug-location !33
+ %rsp = ADD64ri8 %rsp, 8, implicit-def dead %eflags, debug-location !33
+ DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !31
+ %rbx = POP64r implicit-def %rsp, implicit %rsp, debug-location !33
+ %rbp = POP64r implicit-def %rsp, implicit %rsp, debug-location !33
+ TAILJMPd64 @sink, csr_64, implicit %rsp, implicit %rsp, implicit %edi, debug-location !33
+
+...
Modified: llvm/trunk/test/DebugInfo/X86/fission-ranges.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/fission-ranges.ll?rev=282611&r1=282610&r2=282611&view=diff
==============================================================================
--- llvm/trunk/test/DebugInfo/X86/fission-ranges.ll (original)
+++ llvm/trunk/test/DebugInfo/X86/fission-ranges.ll Wed Sep 28 12:51:14 2016
@@ -32,13 +32,13 @@
; CHECK-NEXT: Length: 25
; CHECK-NEXT: Location description: 50 93 04
; CHECK: [[E]]: Beginning address index: 4
-; CHECK-NEXT: Length: 23
+; CHECK-NEXT: Length: 19
; CHECK-NEXT: Location description: 50 93 04
; CHECK: [[B]]: Beginning address index: 5
-; CHECK-NEXT: Length: 21
+; CHECK-NEXT: Length: 17
; CHECK-NEXT: Location description: 50 93 04
; CHECK: [[D]]: Beginning address index: 6
-; CHECK-NEXT: Length: 21
+; CHECK-NEXT: Length: 17
; CHECK-NEXT: Location description: 50 93 04
; Make sure we don't produce any relocations in any .dwo section (though in particular, debug_info.dwo)
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