914066fe38
Loop strength reduction tries to recover debug variable values by looking for simple offsets from PHI values. In really extreme conditions there may be an offset used that won't fit in an int64_t, hitting an APInt assertion. This patch adds a regression test and adjusts the equivalent value collecting code to filter out any values where the offset can't be represented by an int64_t. This means that for very large integers with very large offsets, the variable location will become undef, which is the same behaviour as before 2a6782bb9f1 / D87494. Differential Revision: https://reviews.llvm.org/D94016
74 lines
4.1 KiB
LLVM
74 lines
4.1 KiB
LLVM
; RUN: opt < %s -loop-reduce -S | FileCheck %s
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;
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; Test that LSR avoids crashing on very large integer inputs. It should
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; discard the variable location by creating an undef dbg.value.
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;
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; CHECK: call void @llvm.dbg.value(metadata i128 undef,
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source_filename = "<stdin>"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define dso_local void @qux() local_unnamed_addr !dbg !10 {
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entry:
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br label %for.body, !dbg !17
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for.body: ; preds = %for.body.for.body_crit_edge, %entry
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%0 = phi i128 [ 0, %entry ], [ %.pre8, %for.body.for.body_crit_edge ], !dbg !19
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%add6.i.i = add i128 %0, 18446744073709551615, !dbg !35
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call void @llvm.dbg.value(metadata i128 %add6.i.i, metadata !25, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 128)), !dbg !36
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br label %for.body.for.body_crit_edge
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for.body.for.body_crit_edge: ; preds = %for.body
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%.pre8 = load i128, i128* undef, align 16, !dbg !19, !tbaa !37
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br label %for.body, !dbg !17
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}
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; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8, !9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, globals: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "/tmp/beans.c", directory: "/tmp")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIDerivedType(tag: DW_TAG_typedef, name: "uint64_t", file: !5, line: 1, baseType: !6)
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!5 = !DIFile(filename: "/tmp/beans.c", directory: "")
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!6 = !DIBasicType(name: "long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!7 = !{i32 7, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"wchar_size", i32 4}
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!10 = distinct !DISubprogram(name: "qux", scope: !5, file: !5, line: 27, type: !11, scopeLine: 27, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
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!11 = !DISubroutineType(types: !12)
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!12 = !{null, !13, !13}
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
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!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "croix", file: !5, line: 2, baseType: !15)
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!15 = !DIDerivedType(tag: DW_TAG_typedef, name: "__uint128_t", file: !1, baseType: !16)
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!16 = !DIBasicType(name: "unsigned __int128", size: 128, encoding: DW_ATE_unsigned)
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!17 = !DILocation(line: 30, column: 3, scope: !18)
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!18 = distinct !DILexicalBlock(scope: !10, file: !5, line: 30, column: 3)
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!19 = !DILocation(line: 12, column: 25, scope: !20, inlinedAt: !30)
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!20 = distinct !DISubprogram(name: "bar", scope: !5, file: !5, line: 8, type: !21, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !24)
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!21 = !DISubroutineType(types: !22)
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!22 = !{null, !23, !13}
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!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !4, size: 64)
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!24 = !{!25}
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!25 = !DILocalVariable(name: "tmp", scope: !20, file: !5, line: 9, type: !26)
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!26 = !DIDerivedType(tag: DW_TAG_typedef, name: "xyzzy", file: !5, line: 3, baseType: !27)
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!27 = !DICompositeType(tag: DW_TAG_array_type, baseType: !14, size: 512, elements: !28)
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!28 = !{!29}
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!29 = !DISubrange(count: 4)
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!30 = distinct !DILocation(line: 23, column: 3, scope: !31, inlinedAt: !32)
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!31 = distinct !DISubprogram(name: "baz", scope: !5, file: !5, line: 21, type: !11, scopeLine: 21, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
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!32 = distinct !DILocation(line: 31, column: 5, scope: !33)
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!33 = distinct !DILexicalBlock(scope: !34, file: !5, line: 30, column: 31)
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!34 = distinct !DILexicalBlock(scope: !18, file: !5, line: 30, column: 3)
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!35 = !DILocation(line: 12, column: 23, scope: !20, inlinedAt: !30)
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!36 = !DILocation(line: 0, scope: !20, inlinedAt: !30)
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!37 = !{!38, !38, i64 0}
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!38 = !{!"__int128", !39, i64 0}
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!39 = !{!"omnipotent char", !40, i64 0}
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!40 = !{!"Simple C/C++ TBAA"}
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