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a2029fa58e
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
78 lines
3.8 KiB
LLVM
78 lines
3.8 KiB
LLVM
; RUN: opt -loop-vectorize -pass-remarks-analysis=loop-vectorize < %s 2>&1 | FileCheck %s
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; 1 extern int map[];
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; 2 extern int out[];
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; 3
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; 4 void f(int a, int n) {
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; 5 for (int i = 0; i < n; ++i) {
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; 6 out[i] = a;
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; 7 a = map[a];
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; 8 }
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; 9 }
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; CHECK: remark: /tmp/s.c:5:3: loop not vectorized: value that could not be identified as reduction is used outside the loop
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; %a.addr.08 is the phi corresponding to the remark. It does not have debug
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; location attached. In this case we should use the debug location of the
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; loop rather than emitting <unknown>:0:0:
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; ModuleID = '/tmp/s.c'
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source_filename = "/tmp/s.c"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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@out = external local_unnamed_addr global [0 x i32], align 4
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@map = external local_unnamed_addr global [0 x i32], align 4
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; Function Attrs: norecurse nounwind ssp uwtable
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define void @f(i32 %a, i32 %n) local_unnamed_addr #0 !dbg !6 {
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entry:
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%cmp7 = icmp sgt i32 %n, 0, !dbg !8
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br i1 %cmp7, label %for.body.preheader, label %for.cond.cleanup, !dbg !9
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for.body.preheader: ; preds = %entry
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%wide.trip.count = zext i32 %n to i64, !dbg !9
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br label %for.body, !dbg !10
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for.cond.cleanup: ; preds = %for.body, %entry
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ret void, !dbg !11
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for.body: ; preds = %for.body.preheader, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
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%a.addr.08 = phi i32 [ %0, %for.body ], [ %a, %for.body.preheader ]
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%arrayidx = getelementptr inbounds [0 x i32], [0 x i32]* @out, i64 0, i64 %indvars.iv, !dbg !10
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store i32 %a.addr.08, i32* %arrayidx, align 4, !dbg !12, !tbaa !13
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%idxprom1 = sext i32 %a.addr.08 to i64, !dbg !17
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%arrayidx2 = getelementptr inbounds [0 x i32], [0 x i32]* @map, i64 0, i64 %idxprom1, !dbg !17
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%0 = load i32, i32* %arrayidx2, align 4, !dbg !17, !tbaa !13
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !9
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%exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count, !dbg !9
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br i1 %exitcond, label %for.cond.cleanup, label %for.body, !dbg !9, !llvm.loop !18
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}
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attributes #0 = { norecurse nounwind ssp uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="core2" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+ssse3,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 281293) (llvm/trunk 281290)", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
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!1 = !DIFile(filename: "/tmp/s.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 1, !"PIC Level", i32 2}
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!5 = !{!"clang version 4.0.0 (trunk 281293) (llvm/trunk 281290)"}
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!6 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 4, type: !7, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
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!7 = !DISubroutineType(types: !2)
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!8 = !DILocation(line: 5, column: 21, scope: !6)
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!9 = !DILocation(line: 5, column: 3, scope: !6)
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!10 = !DILocation(line: 6, column: 5, scope: !6)
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!11 = !DILocation(line: 9, column: 1, scope: !6)
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!12 = !DILocation(line: 6, column: 12, scope: !6)
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!13 = !{!14, !14, i64 0}
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!14 = !{!"int", !15, i64 0}
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!15 = !{!"omnipotent char", !16, i64 0}
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!16 = !{!"Simple C/C++ TBAA"}
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!17 = !DILocation(line: 7, column: 9, scope: !6)
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!18 = distinct !{!18, !9}
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