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Encode duplication factor from loop vectorization and loop unrolling to discriminator. Summary: This patch starts the implementation as discuss in the following RFC: http://lists.llvm.org/pipermail/llvm-dev/2016-October/106532.html When optimization duplicates code that will scale down the execution count of a basic block, we will record the duplication factor as part of discriminator so that the offline process tool can find the duplication factor and collect the accurate execution frequency of the corresponding source code. Two important optimization that fall into this category is loop vectorization and loop unroll. This patch records the duplication factor for these 2 optimizations. The recording will be guarded by a flag encode-duplication-in-discriminators, which is off by default. Reviewers: probinson, aprantl, davidxl, hfinkel, echristo Reviewed By: hfinkel Subscribers: mehdi_amini, anemet, mzolotukhin, llvm-commits Differential Revision: https://reviews.llvm.org/D26420 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294782 91177308-0d34-0410-b5e6-96231b3b80d8 Dehao Chen 2 years ago
16 changed file(s) with 236 addition(s) and 32 deletion(s). Raw diff Collapse all Expand all
40024002 ``retainedTypes:``, ``subprograms:``, ``globals:``, ``imports:`` and ``macros:``
40034003 fields are tuples containing the debug info to be emitted along with the compile
40044004 unit, regardless of code optimizations (some nodes are only emitted if there are
4005 references to them from instructions).
4005 references to them from instructions). The ``debugInfoForProfiling:`` field is a
4006 boolean indicating whether or not line-table discriminators are updated to
4007 provide more-accurate debug info for profiling results.
40064008
40074009 .. code-block:: text
40084010
13141314 ///
13151315 /// DWARF discriminators distinguish identical file locations between
13161316 /// instructions that are on different basic blocks.
1317 ///
1318 /// There are 3 components stored in discriminator, from lower bits:
1319 ///
1320 /// Base discriminator: assigned by AddDiscriminators pass to identify IRs
1321 /// that are defined by the same source line, but
1322 /// different basic blocks.
1323 /// Duplication factor: assigned by optimizations that will scale down
1324 /// the execution frequency of the original IR.
1325 /// Copy Identifier: assigned by optimizations that clones the IR.
1326 /// Each copy of the IR will be assigned an identifier.
1327 ///
1328 /// Encoding:
1329 ///
1330 /// The above 3 components are encoded into a 32bit unsigned integer in
1331 /// order. If the lowest bit is 1, the current component is empty, and the
1332 /// next component will start in the next bit. Otherwise, the the current
1333 /// component is non-empty, and its content starts in the next bit. The
1334 /// length of each components is either 5 bit or 12 bit: if the 7th bit
1335 /// is 0, the bit 2~6 (5 bits) are used to represent the component; if the
1336 /// 7th bit is 1, the bit 2~6 (5 bits) and 8~14 (7 bits) are combined to
1337 /// represent the component.
1338
13171339 inline unsigned getDiscriminator() const;
13181340
13191341 /// Returns a new DILocation with updated \p Discriminator.
1320 inline DILocation *cloneWithDiscriminator(unsigned Discriminator) const;
1342 inline const DILocation *cloneWithDiscriminator(unsigned Discriminator) const;
1343
1344 /// Returns a new DILocation with updated base discriminator \p BD.
1345 inline const DILocation *setBaseDiscriminator(unsigned BD) const;
1346
1347 /// Returns the duplication factor stored in the discriminator.
1348 inline unsigned getDuplicationFactor() const;
1349
1350 /// Returns the copy identifier stored in the discriminator.
1351 inline unsigned getCopyIdentifier() const;
1352
1353 /// Returns the base discriminator stored in the discriminator.
1354 inline unsigned getBaseDiscriminator() const;
1355
1356 /// Returns a new DILocation with duplication factor \p DF encoded in the
1357 /// discriminator.
1358 inline const DILocation *cloneWithDuplicationFactor(unsigned DF) const;
13211359
13221360 /// When two instructions are combined into a single instruction we also
13231361 /// need to combine the original locations into a single location.
13491387
13501388 static bool classof(const Metadata *MD) {
13511389 return MD->getMetadataID() == DILocationKind;
1390 }
1391
1392 /// With a give unsigned int \p U, use up to 13 bits to represent it.
1393 /// old_bit 1~5 --> new_bit 1~5
1394 /// old_bit 6~12 --> new_bit 7~13
1395 /// new_bit_6 is 0 if higher bits (7~13) are all 0
1396 static unsigned getPrefixEncodingFromUnsigned(unsigned U) {
1397 U &= 0xfff;
1398 return U > 0x1f ? (((U & 0xfe0) << 1) | (U & 0x1f) | 0x20) : U;
1399 }
1400
1401 /// Reverse transformation as getPrefixEncodingFromUnsigned.
1402 static unsigned getUnsignedFromPrefixEncoding(unsigned U) {
1403 return (U & 0x20) ? (((U >> 1) & 0xfe0) | (U & 0x1f)) : (U & 0x1f);
1404 }
1405
1406 /// Returns the next component stored in discriminator.
1407 static unsigned getNextComponentInDiscriminator(unsigned D) {
1408 if ((D & 1) == 0)
1409 return D >> ((D & 0x40) ? 14 : 7);
1410 else
1411 return D >> 1;
13521412 }
13531413 };
13541414
16831743 return 0;
16841744 }
16851745
1686 DILocation *DILocation::cloneWithDiscriminator(unsigned Discriminator) const {
1746 const DILocation *
1747 DILocation::cloneWithDiscriminator(unsigned Discriminator) const {
16871748 DIScope *Scope = getScope();
16881749 // Skip all parent DILexicalBlockFile that already have a discriminator
16891750 // assigned. We do not want to have nested DILexicalBlockFiles that have
16971758 DILexicalBlockFile::get(getContext(), Scope, getFile(), Discriminator);
16981759 return DILocation::get(getContext(), getLine(), getColumn(), NewScope,
16991760 getInlinedAt());
1761 }
1762
1763 unsigned DILocation::getBaseDiscriminator() const {
1764 unsigned D = getDiscriminator();
1765 if ((D & 1) == 0)
1766 return getUnsignedFromPrefixEncoding(D >> 1);
1767 else
1768 return 0;
1769 }
1770
1771 unsigned DILocation::getDuplicationFactor() const {
1772 unsigned D = getDiscriminator();
1773 D = getNextComponentInDiscriminator(D);
1774 if (D == 0 || (D & 1))
1775 return 1;
1776 else
1777 return getUnsignedFromPrefixEncoding(D >> 1);
1778 }
1779
1780 unsigned DILocation::getCopyIdentifier() const {
1781 return getUnsignedFromPrefixEncoding(getNextComponentInDiscriminator(
1782 getNextComponentInDiscriminator(getDiscriminator())));
1783 }
1784
1785 const DILocation *DILocation::setBaseDiscriminator(unsigned D) const {
1786 if (D == 0)
1787 return this;
1788 else
1789 return cloneWithDiscriminator(getPrefixEncodingFromUnsigned(D) << 1);
1790 }
1791
1792 const DILocation *DILocation::cloneWithDuplicationFactor(unsigned DF) const {
1793 DF *= getDuplicationFactor();
1794 if (DF <= 1)
1795 return this;
1796
1797 unsigned BD = getBaseDiscriminator();
1798 unsigned CI = getCopyIdentifier() << (DF > 0x1f ? 14 : 7);
1799 unsigned D = CI | (getPrefixEncodingFromUnsigned(DF) << 1);
1800
1801 if (BD == 0)
1802 D = (D << 1) | 1;
1803 else
1804 D = (D << (BD > 0x1f ? 14 : 7)) | (getPrefixEncodingFromUnsigned(BD) << 1);
1805
1806 return cloneWithDiscriminator(D);
17001807 }
17011808
17021809 class DINamespace : public DIScope {
670670 /// to \a DISubprogram.
671671 DISubprogram *getSubprogram() const;
672672
673 /// Returns true if we should emit debug info for profiling.
674 bool isDebugInfoForProfiling() const;
675
673676 private:
674677 void allocHungoffUselist();
675678 template void setHungoffOperand(Constant *C);
14581458 return cast_or_null(getMetadata(LLVMContext::MD_dbg));
14591459 }
14601460
1461 bool Function::isDebugInfoForProfiling() const {
1462 if (DISubprogram *SP = getSubprogram()) {
1463 if (DICompileUnit *CU = SP->getUnit()) {
1464 return CU->getDebugInfoForProfiling();
1465 }
1466 }
1467 return false;
1468 }
1469
14611470 void GlobalVariable::addDebugInfo(DIGlobalVariableExpression *GV) {
14621471 addMetadata(LLVMContext::MD_dbg, *GV);
14631472 }
189189 // discriminator is needed to distinguish both instructions.
190190 // Only the lowest 7 bits are used to represent a discriminator to fit
191191 // it in 1 byte ULEB128 representation.
192 unsigned Discriminator = (R.second ? ++LDM[L] : LDM[L]) & 0x7f;
193 I.setDebugLoc(DIL->cloneWithDiscriminator(Discriminator));
192 unsigned Discriminator = R.second ? ++LDM[L] : LDM[L];
193 I.setDebugLoc(DIL->setBaseDiscriminator(Discriminator));
194194 DEBUG(dbgs() << DIL->getFilename() << ":" << DIL->getLine() << ":"
195195 << DIL->getColumn() << ":" << Discriminator << " " << I
196196 << "\n");
215215 Location L =
216216 std::make_pair(CurrentDIL->getFilename(), CurrentDIL->getLine());
217217 if (!CallLocations.insert(L).second) {
218 Current->setDebugLoc(
219 CurrentDIL->cloneWithDiscriminator((++LDM[L]) & 0x7f));
218 unsigned Discriminator = ++LDM[L];
219 Current->setDebugLoc(CurrentDIL->setBaseDiscriminator(Discriminator));
220220 Changed = true;
221221 }
222222 }
2626 #include "llvm/Analysis/ScalarEvolution.h"
2727 #include "llvm/IR/BasicBlock.h"
2828 #include "llvm/IR/DataLayout.h"
29 #include "llvm/IR/DebugInfoMetadata.h"
2930 #include "llvm/IR/Dominators.h"
3031 #include "llvm/IR/IntrinsicInst.h"
3132 #include "llvm/IR/LLVMContext.h"
461462 for (Loop *SubLoop : *L)
462463 LoopsToSimplify.insert(SubLoop);
463464
465 if (Header->getParent()->isDebugInfoForProfiling())
466 for (BasicBlock *BB : L->getBlocks())
467 for (Instruction &I : *BB)
468 if (const DILocation *DIL = I.getDebugLoc())
469 I.setDebugLoc(DIL->cloneWithDuplicationFactor(Count));
470
464471 for (unsigned It = 1; It != Count; ++It) {
465472 std::vector NewBlocks;
466473 SmallDenseMap NewLoops;
615615 /// vector of instructions.
616616 void addMetadata(ArrayRef To, Instruction *From);
617617
618 /// \brief Set the debug location in the builder using the debug location in
619 /// the instruction.
620 void setDebugLocFromInst(IRBuilder<> &B, const Value *Ptr);
621
618622 /// This is a helper class for maintaining vectorization state. It's used for
619623 /// mapping values from the original loop to their corresponding values in
620624 /// the new loop. Two mappings are maintained: one for vectorized values and
864868 return I;
865869 }
866870
867 /// \brief Set the debug location in the builder using the debug location in the
868 /// instruction.
869 static void setDebugLocFromInst(IRBuilder<> &B, const Value *Ptr) {
870 if (const Instruction *Inst = dyn_cast_or_null(Ptr))
871 B.SetCurrentDebugLocation(Inst->getDebugLoc());
872 else
871 void InnerLoopVectorizer::setDebugLocFromInst(IRBuilder<> &B, const Value *Ptr) {
872 if (const Instruction *Inst = dyn_cast_or_null(Ptr)) {
873 const DILocation *DIL = Inst->getDebugLoc();
874 if (DIL && Inst->getFunction()->isDebugInfoForProfiling())
875 B.SetCurrentDebugLocation(DIL->cloneWithDuplicationFactor(UF * VF));
876 else
877 B.SetCurrentDebugLocation(DIL);
878 } else
873879 B.SetCurrentDebugLocation(DebugLoc());
874880 }
875881
5757 ; CHECK: ![[FOO:[0-9]+]] = distinct !DISubprogram(name: "foo"
5858 ; CHECK: ![[BLOCK:[0-9]+]] = distinct !DILexicalBlock(scope: ![[FOO]],{{.*}} line: 3)
5959 ; CHECK: ![[THEN]] = !DILocation(line: 3, scope: ![[BLOCKFILE:[0-9]+]])
60 ; CHECK: ![[BLOCKFILE]] = !DILexicalBlockFile(scope: ![[BLOCK]],{{.*}} discriminator: 1)
60 ; CHECK: ![[BLOCKFILE]] = !DILexicalBlockFile(scope: ![[BLOCK]],{{.*}} discriminator: 2)
6161 ; CHECK: ![[END]] = !DILocation(line: 4, scope: ![[FOO]])
4646 !14 = !DILocation(line: 4, column: 3, scope: !4)
4747
4848 ; CHECK: ![[CALL2]] = !DILocation(line: 4, column: 10, scope: ![[CALL2BLOCK:[0-9]+]])
49 ; CHECK: ![[CALL2BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 1)
49 ; CHECK: ![[CALL2BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 2)
44 ; #1 void bar();
55 ; #2
66 ; #3 void foo() {
7 ; #4 bar();bar()/*discriminator 1*/;bar()/*discriminator 2*/;
7 ; #4 bar();bar()/*discriminator 2*/;bar()/*discriminator 4*/;
88 ; #5 }
99
1010 ; Function Attrs: uwtable
4848 !13 = !DILocation(line: 5, column: 1, scope: !4)
4949
5050 ; CHECK: ![[CALL1]] = !DILocation(line: 4, column: 9, scope: ![[CALL1BLOCK:[0-9]+]])
51 ; CHECK: ![[CALL1BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 1)
51 ; CHECK: ![[CALL1BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 2)
5252 ; CHECK: ![[CALL2]] = !DILocation(line: 4, column: 15, scope: ![[CALL2BLOCK:[0-9]+]])
53 ; CHECK: ![[CALL2BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 2)
53 ; CHECK: ![[CALL2BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 4)
99 ; #6 }
1010
1111 ; bar(5): discriminator 0
12 ; bar(3): discriminator 1
12 ; bar(3): discriminator 2
1313
1414 ; Function Attrs: uwtable
1515 define void @_Z3fooi(i32 %i) #0 !dbg !4 {
6868 !20 = !DILocation(line: 6, column: 1, scope: !4)
6969
7070 ; CHECK: ![[ELSE]] = !DILocation(line: 5, column: 18, scope: ![[ELSEBLOCK:[0-9]+]])
71 ; CHECK: ![[ELSEBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 1)
71 ; CHECK: ![[ELSEBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 2)
6868 !12 = !DILocation(line: 3, scope: !13)
6969
7070 !13 = distinct !DILexicalBlock(line: 3, column: 0, file: !1, scope: !11)
71 ; CHECK: !DILexicalBlockFile(scope: ![[BLOCK2:[0-9]+]],{{.*}} discriminator: 1)
71 ; CHECK: !DILexicalBlockFile(scope: ![[BLOCK2:[0-9]+]],{{.*}} discriminator: 2)
7272
7373 !14 = !DILocation(line: 4, scope: !13)
7474 ; CHECK: ![[BLOCK2]] = distinct !DILexicalBlock(scope: ![[BLOCK1]],{{.*}} line: 3)
6161 !12 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, variables: !2)
6262 !13 = distinct !DILocation(line: 1, column: 17, scope: !14)
6363 ; CHECK: ![[BF:.*]] = !DILexicalBlockFile(scope: ![[LB1:[0-9]+]],
64 ; CHECK-SAME: discriminator: 1)
65 !14 = !DILexicalBlockFile(scope: !15, file: !1, discriminator: 1)
64 ; CHECK-SAME: discriminator: 2)
65 !14 = !DILexicalBlockFile(scope: !15, file: !1, discriminator: 2)
6666 ; CHECK: ![[LB1]] = distinct !DILexicalBlock(scope: ![[LB2:[0-9]+]],
6767 ; CHECK-SAME: line: 1, column: 16)
6868 !15 = distinct !DILexicalBlock(scope: !16, file: !1, line: 1, column: 16)
6666 !12 = !DILocation(line: 4, scope: !4)
6767
6868 ; CHECK: ![[THEN]] = !DILocation(line: 3, scope: ![[THENBLOCK:[0-9]+]])
69 ; CHECK: ![[THENBLOCK]] = !DILexicalBlockFile(scope: ![[SCOPE:[0-9]+]],{{.*}} discriminator: 1)
69 ; CHECK: ![[THENBLOCK]] = !DILexicalBlockFile(scope: ![[SCOPE:[0-9]+]],{{.*}} discriminator: 2)
7070 ; CHECK: ![[ELSE]] = !DILocation(line: 3, scope: ![[ELSEBLOCK:[0-9]+]])
71 ; CHECK: ![[ELSEBLOCK]] = !DILexicalBlockFile(scope: ![[SCOPE]],{{.*}} discriminator: 2)
71 ; CHECK: ![[ELSEBLOCK]] = !DILexicalBlockFile(scope: ![[SCOPE]],{{.*}} discriminator: 4)
66 ; #3 }
77
88 ; i == 3: discriminator 0
9 ; i == 5: discriminator 1
10 ; return 100: discriminator 2
11 ; return 99: discriminator 3
9 ; i == 5: discriminator 2
10 ; return 100: discriminator 4
11 ; return 99: discriminator 6
1212
1313 define i32 @_Z3fooi(i32 %i) #0 !dbg !4 {
1414 %1 = alloca i32, align 4
9090 ; CHECK: ![[F:.*]] = distinct !DISubprogram(name: "foo",
9191 ; CHECK: ![[IF:.*]] = distinct !DILexicalBlock(scope: ![[F]],{{.*}}line: 2, column: 7)
9292 ; CHECK: ![[THEN1]] = !DILocation(line: 2, column: 17, scope: ![[THENBLOCK:[0-9]+]])
93 ; CHECK: ![[THENBLOCK]] = !DILexicalBlockFile(scope: ![[IF]],{{.*}} discriminator: 1)
93 ; CHECK: ![[THENBLOCK]] = !DILexicalBlockFile(scope: ![[IF]],{{.*}} discriminator: 2)
9494 ; CHECK: ![[THEN2]] = !DILocation(line: 2, column: 19, scope: ![[THENBLOCK]])
9595 ; CHECK: ![[THEN3]] = !DILocation(line: 2, column: 7, scope: ![[BRBLOCK:[0-9]+]])
96 ; CHECK: ![[BRBLOCK]] = !DILexicalBlockFile(scope: ![[F]],{{.*}} discriminator: 1)
96 ; CHECK: ![[BRBLOCK]] = !DILexicalBlockFile(scope: ![[F]],{{.*}} discriminator: 2)
9797 ; CHECK: ![[ELSE]] = !DILocation(line: 2, column: 25, scope: ![[ELSEBLOCK:[0-9]+]])
98 ; CHECK: ![[ELSEBLOCK]] = !DILexicalBlockFile(scope: ![[IF]],{{.*}} discriminator: 2)
98 ; CHECK: ![[ELSEBLOCK]] = !DILexicalBlockFile(scope: ![[IF]],{{.*}} discriminator: 4)
9999 ; CHECK: ![[COMBINE]] = !DILocation(line: 2, column: 42, scope: ![[COMBINEBLOCK:[0-9]+]])
100 ; CHECK: ![[COMBINEBLOCK]] = !DILexicalBlockFile(scope: ![[IF]],{{.*}} discriminator: 3)
100 ; CHECK: ![[COMBINEBLOCK]] = !DILexicalBlockFile(scope: ![[IF]],{{.*}} discriminator: 6)
0 ; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 < %s | FileCheck --check-prefix=LOOPVEC_4_1 %s
1 ; RUN: opt -S -loop-vectorize -force-vector-width=2 -force-vector-interleave=3 < %s | FileCheck --check-prefix=LOOPVEC_2_3 %s
2 ; RUN: opt -S -loop-unroll -unroll-count=5 < %s | FileCheck --check-prefix=LOOPUNROLL_5 %s
3 ; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-interleave=4 -loop-unroll -unroll-count=2 < %s | FileCheck --check-prefix=LOOPVEC_UNROLL %s
4
5 ; Test if vectorization/unroll factor is recorded in discriminator.
6 ;
7 ; Original source code:
8 ; 1 int *a;
9 ; 2 int *b;
10 ; 3
11 ; 4 void foo() {
12 ; 5 for (int i = 0; i < 4096; i++)
13 ; 6 a[i] += b[i];
14 ; 7 }
15
16 @a = local_unnamed_addr global i32* null, align 8
17 @b = local_unnamed_addr global i32* null, align 8
18
19 define void @_Z3foov() local_unnamed_addr #0 !dbg !6 {
20 %1 = load i32*, i32** @b, align 8, !dbg !8, !tbaa !9
21 %2 = load i32*, i32** @a, align 8, !dbg !13, !tbaa !9
22 br label %3, !dbg !14
23
24 ;
25 %indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.next, %3 ]
26 %4 = getelementptr inbounds i32, i32* %1, i64 %indvars.iv, !dbg !8
27 %5 = load i32, i32* %4, align 4, !dbg !8, !tbaa !15
28 %6 = getelementptr inbounds i32, i32* %2, i64 %indvars.iv, !dbg !13
29 %7 = load i32, i32* %6, align 4, !dbg !17, !tbaa !15
30 %8 = add nsw i32 %7, %5, !dbg !17
31 store i32 %8, i32* %6, align 4, !dbg !17, !tbaa !15
32 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !18
33 %exitcond = icmp eq i64 %indvars.iv.next, 4096, !dbg !19
34 br i1 %exitcond, label %9, label %3, !dbg !14, !llvm.loop !20
35
36 ;
37 ret void, !dbg !21
38 }
39
40 ;LOOPVEC_4_1: discriminator: 17
41 ;LOOPVEC_2_3: discriminator: 25
42 ;LOOPUNROLL_5: discriminator: 21
43 ; When unrolling after loop vectorize, both vec_body and remainder loop
44 ; are unrolled.
45 ;LOOPVEC_UNROLL: discriminator: 385
46 ;LOOPVEC_UNROLL: discriminator: 9
47
48 !llvm.dbg.cu = !{!0}
49 !llvm.module.flags = !{!3, !4}
50
51 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, debugInfoForProfiling: true)
52 !1 = !DIFile(filename: "a.cc", directory: "/")
53 !3 = !{i32 2, !"Dwarf Version", i32 4}
54 !4 = !{i32 2, !"Debug Info Version", i32 3}
55 !6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 4, unit: !0)
56 !8 = !DILocation(line: 6, column: 13, scope: !6)
57 !9 = !{!10, !10, i64 0}
58 !10 = !{!"any pointer", !11, i64 0}
59 !11 = !{!"omnipotent char", !12, i64 0}
60 !12 = !{!"Simple C++ TBAA"}
61 !13 = !DILocation(line: 6, column: 5, scope: !6)
62 !14 = !DILocation(line: 5, column: 3, scope: !6)
63 !15 = !{!16, !16, i64 0}
64 !16 = !{!"int", !11, i64 0}
65 !17 = !DILocation(line: 6, column: 10, scope: !6)
66 !18 = !DILocation(line: 5, column: 30, scope: !6)
67 !19 = !DILocation(line: 5, column: 21, scope: !6)
68 !20 = distinct !{!20, !14}
69 !21 = !DILocation(line: 7, column: 1, scope: !6)