2a6782bb9f
Use SCEV to salvage additional @llvm.dbg.value that have turned into referencing undef after transformation (and traditional salvageDebugInfo). Before rewrite (but after introduction of new induction variables) use SCEV to compute an equivalent set of values for each @llvm.dbg.value in the loop body (among the loop header PHI-nodes). After rewrite (and dead PHI elimination) update those @llvm.dbg.value now referencing undef by picking a remaining value from its equivalence set. Allow match with offset by inserting compensation code in the DIExpression. Fixes : PR38815 Differential Revision: https://reviews.llvm.org/D87494
75 lines
3.9 KiB
LLVM
75 lines
3.9 KiB
LLVM
; RUN: opt < %s -loop-reduce -S | FileCheck %s
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; Test that LSR preserves debug-info for induction variables.
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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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define dso_local void @foo(i8* nocapture %p) local_unnamed_addr !dbg !7 {
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; CHECK-LABEL: @foo(
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entry:
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call void @llvm.dbg.value(metadata i8* %p, metadata !13, metadata !DIExpression()), !dbg !16
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call void @llvm.dbg.value(metadata i8 0, metadata !14, metadata !DIExpression()), !dbg !17
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br label %for.body, !dbg !18
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for.cond.cleanup: ; preds = %for.body
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ret void, !dbg !19
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for.body: ; preds = %entry, %for.body
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; CHECK-LABEL: for.body:
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%i.06 = phi i8 [ 0, %entry ], [ %inc, %for.body ]
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%p.addr.05 = phi i8* [ %p, %entry ], [ %add.ptr, %for.body ]
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call void @llvm.dbg.value(metadata i8 %i.06, metadata !14, metadata !DIExpression()), !dbg !17
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call void @llvm.dbg.value(metadata i8* %p.addr.05, metadata !13, metadata !DIExpression()), !dbg !16
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; CHECK-NOT: call void @llvm.dbg.value(metadata i8* undef
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; CHECK: call void @llvm.dbg.value(metadata i8* %lsr.iv, metadata ![[MID_p:[0-9]+]], metadata !DIExpression(DW_OP_constu, 3, DW_OP_minus, DW_OP_stack_value)), !dbg !16
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%add.ptr = getelementptr inbounds i8, i8* %p.addr.05, i64 3, !dbg !20
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call void @llvm.dbg.value(metadata i8* %add.ptr, metadata !13, metadata !DIExpression()), !dbg !16
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; CHECK-NOT: call void @llvm.dbg.value(metadata i8* undef
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; CHECK: call void @llvm.dbg.value(metadata i8* %lsr.iv, metadata ![[MID_p]], metadata !DIExpression()), !dbg !16
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store i8 %i.06, i8* %add.ptr, align 1, !dbg !23, !tbaa !24
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%inc = add nuw nsw i8 %i.06, 1, !dbg !27
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call void @llvm.dbg.value(metadata i8 %inc, metadata !14, metadata !DIExpression()), !dbg !17
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%exitcond.not = icmp eq i8 %inc, 32, !dbg !28
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br i1 %exitcond.not, label %for.cond.cleanup, label %for.body, !dbg !18, !llvm.loop !29
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}
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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 = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "lsrdbg.c", directory: "/")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 12.0.0"}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null, !10}
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
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!11 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
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!12 = !{!13, !14}
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!13 = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 2, type: !10)
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; CHECK: ![[MID_p]] = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 2, type: !10)
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!14 = !DILocalVariable(name: "i", scope: !15, file: !1, line: 4, type: !11)
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!15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 3)
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!16 = !DILocation(line: 0, scope: !7)
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!17 = !DILocation(line: 0, scope: !15)
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!18 = !DILocation(line: 4, column: 3, scope: !15)
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!19 = !DILocation(line: 8, column: 1, scope: !7)
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!20 = !DILocation(line: 5, column: 7, scope: !21)
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!21 = distinct !DILexicalBlock(scope: !22, file: !1, line: 4, column: 42)
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!22 = distinct !DILexicalBlock(scope: !15, file: !1, line: 4, column: 3)
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!23 = !DILocation(line: 6, column: 8, scope: !21)
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!24 = !{!25, !25, i64 0}
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!25 = !{!"omnipotent char", !26, i64 0}
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!26 = !{!"Simple C/C++ TBAA"}
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!27 = !DILocation(line: 4, column: 38, scope: !22)
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!28 = !DILocation(line: 4, column: 31, scope: !22)
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!29 = distinct !{!29, !18, !30, !31}
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!30 = !DILocation(line: 7, column: 3, scope: !15)
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!31 = !{!"llvm.loop.unroll.disable"}
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