c672ba7dde
With intrinsics representing debug-info, we just clone all the intrinsics when inlining a function and don't think about it any further. With non-instruction debug-info however we need to be a bit more careful and manually move the debug-info from one place to another. For the most part, this means keeping a "cursor" during block cloning of where we last copied debug-info from, and performing debug-info copying whenever we successfully clone another instruction. There are several utilities in LLVM for doing this, all of which now need to manually call cloneDebugInfo. The testing story for this is not well covered as we could rely on normal instruction-cloning mechanisms to do all the hard stuff. Thus, I've added a few tests to explicitly test dbg.value behaviours, ahead of them becoming not-instructions.
77 lines
3.5 KiB
LLVM
77 lines
3.5 KiB
LLVM
; RUN: opt %s -S -o - -passes=loop-unroll | FileCheck %s
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; RUN: opt %s -S -o - -passes=loop-unroll --try-experimental-debuginfo-iterators | FileCheck %s
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; generated at -O3 from:
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; void f() {
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; for (int i = 1; i <=32; i <<=2 )
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; bar(i>>1);
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; }
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source_filename = "/tmp/loop.c"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.13.0"
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; Function Attrs: nounwind ssp uwtable
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define void @f() local_unnamed_addr #0 !dbg !8 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 1, metadata !12, metadata !DIExpression()), !dbg !15
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br label %for.body, !dbg !16
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for.cond.cleanup: ; preds = %for.body
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ret void, !dbg !17
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for.body: ; preds = %entry, %for.body
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%i.04 = phi i32 [ 1, %entry ], [ %shl, %for.body ]
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tail call void @llvm.dbg.value(metadata i32 %i.04, metadata !12, metadata !DIExpression()), !dbg !15
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%shr = ashr i32 %i.04, 1, !dbg !18
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; The loop gets unrolled entirely.
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; CHECK: call void @llvm.dbg.value(metadata i32 1, metadata !12, metadata !DIExpression()), !dbg !15
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; CHECK: call void @llvm.dbg.value(metadata i32 4, metadata !12, metadata !DIExpression()), !dbg !15
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; CHECK: call void @llvm.dbg.value(metadata i32 16, metadata !12, metadata !DIExpression()), !dbg !15
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; CHECK: call void @llvm.dbg.value(metadata i32 64, metadata !12, metadata !DIExpression()), !dbg !15
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%call = tail call i32 (i32, ...) @bar(i32 %shr) #3, !dbg !20
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%shl = shl i32 %i.04, 2, !dbg !21
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tail call void @llvm.dbg.value(metadata i32 %shl, metadata !12, metadata !DIExpression()), !dbg !15
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%cmp = icmp slt i32 %shl, 33, !dbg !22
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br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !16, !llvm.loop !23
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}
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declare i32 @bar(...) local_unnamed_addr
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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attributes #0 = { nounwind ssp uwtable }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 317113) (llvm/trunk 317122)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "/tmp/loop.c", directory: "/Data/llvm")
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!2 = !{}
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!3 = !{i32 2, !"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 = !{i32 7, !"PIC Level", i32 2}
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!7 = !{!"clang version 6.0.0 (trunk 317113) (llvm/trunk 317122)"}
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!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !11)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null}
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!11 = !{!12}
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!12 = !DILocalVariable(name: "i", scope: !13, file: !1, line: 2, type: !14)
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!13 = distinct !DILexicalBlock(scope: !8, file: !1, line: 2, column: 3)
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!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!15 = !DILocation(line: 2, column: 12, scope: !13)
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!16 = !DILocation(line: 2, column: 3, scope: !13)
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!17 = !DILocation(line: 4, column: 1, scope: !8)
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!18 = !DILocation(line: 3, column: 10, scope: !19)
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!19 = distinct !DILexicalBlock(scope: !13, file: !1, line: 2, column: 3)
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!20 = !DILocation(line: 3, column: 5, scope: !19)
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!21 = !DILocation(line: 2, column: 29, scope: !19)
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!22 = !DILocation(line: 2, column: 21, scope: !19)
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!23 = distinct !{!23, !16, !24}
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!24 = !DILocation(line: 3, column: 13, scope: !13)
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