2c864551df
In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
94 lines
4.3 KiB
LLVM
94 lines
4.3 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -S 2>&1 | FileCheck %s
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; RUN: opt < %s -loop-vectorize -force-vector-width=1 -S 2>&1 | FileCheck %s -check-prefix=NOANALYSIS
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; RUN: opt < %s -loop-vectorize -force-vector-width=4 -pass-remarks-missed='loop-vectorize' -S 2>&1 | FileCheck %s -check-prefix=MOREINFO
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; CHECK: remark: source.cpp:4:5: loop not vectorized: loop contains a switch statement
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; CHECK: warning: source.cpp:4:5: loop not vectorized: failed explicitly specified loop vectorization
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; NOANALYSIS-NOT: remark: {{.*}}
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; NOANALYSIS: warning: source.cpp:4:5: loop not interleaved: failed explicitly specified loop interleaving
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; MOREINFO: remark: source.cpp:4:5: loop not vectorized: loop contains a switch statement
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; MOREINFO: remark: source.cpp:4:5: loop not vectorized (Force=true, Vector Width=4)
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; MOREINFO: warning: source.cpp:4:5: loop not vectorized: failed explicitly specified loop vectorization
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; CHECK: _Z11test_switchPii
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; CHECK-NOT: x i32>
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; CHECK: ret
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; Function Attrs: nounwind optsize ssp uwtable
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define void @_Z11test_switchPii(i32* nocapture %A, i32 %Length) #0 !dbg !4 {
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entry:
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%cmp18 = icmp sgt i32 %Length, 0, !dbg !10
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br i1 %cmp18, label %for.body.preheader, label %for.end, !dbg !10, !llvm.loop !12
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for.body.preheader: ; preds = %entry
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br label %for.body, !dbg !14
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for.body: ; preds = %for.body.preheader, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %for.body.preheader ]
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%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv, !dbg !14
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%0 = load i32, i32* %arrayidx, align 4, !dbg !14, !tbaa !16
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switch i32 %0, label %for.inc [
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i32 0, label %sw.bb
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i32 1, label %sw.bb3
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], !dbg !14
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sw.bb: ; preds = %for.body
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%1 = trunc i64 %indvars.iv to i32, !dbg !20
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%mul = shl nsw i32 %1, 1, !dbg !20
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br label %for.inc, !dbg !22
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sw.bb3: ; preds = %for.body
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%2 = trunc i64 %indvars.iv to i32, !dbg !23
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store i32 %2, i32* %arrayidx, align 4, !dbg !23, !tbaa !16
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br label %for.inc, !dbg !23
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for.inc: ; preds = %sw.bb3, %for.body, %sw.bb
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%storemerge = phi i32 [ %mul, %sw.bb ], [ 0, %for.body ], [ 0, %sw.bb3 ]
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store i32 %storemerge, i32* %arrayidx, align 4, !dbg !20, !tbaa !16
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !10
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32, !dbg !10
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%exitcond = icmp eq i32 %lftr.wideiv, %Length, !dbg !10
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br i1 %exitcond, label %for.end.loopexit, label %for.body, !dbg !10, !llvm.loop !12
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for.end.loopexit: ; preds = %for.inc
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %entry
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ret void, !dbg !24
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}
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attributes #0 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!llvm.ident = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0", isOptimized: true, runtimeVersion: 6, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "source.cpp", directory: ".")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "test_switch", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "source.cpp", directory: ".")
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!6 = !DISubroutineType(types: !2)
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!7 = !{i32 2, !"Dwarf Version", i32 2}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{!"clang version 3.5.0"}
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!10 = !DILocation(line: 3, column: 8, scope: !11)
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!11 = distinct !DILexicalBlock(line: 3, column: 3, file: !1, scope: !4)
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!12 = !{!12, !13, !13}
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!13 = !{!"llvm.loop.vectorize.enable", i1 true}
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!14 = !DILocation(line: 4, column: 5, scope: !15)
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!15 = distinct !DILexicalBlock(line: 3, column: 36, file: !1, scope: !11)
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!16 = !{!17, !17, i64 0}
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!17 = !{!"int", !18, i64 0}
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!18 = !{!"omnipotent char", !19, i64 0}
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!19 = !{!"Simple C/C++ TBAA"}
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!20 = !DILocation(line: 6, column: 7, scope: !21)
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!21 = distinct !DILexicalBlock(line: 4, column: 18, file: !1, scope: !15)
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!22 = !DILocation(line: 7, column: 5, scope: !21)
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!23 = !DILocation(line: 9, column: 7, scope: !21)
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!24 = !DILocation(line: 14, column: 1, scope: !4)
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