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llvm-project/llvm/test/DebugInfo/unrolled-loop-remainder.ll

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[LoopUnroll][DebugInfo] Don't add metadata to unrolled remainder loop Debug information can be, and was, corrupted when the runtime remainder loop was fully unrolled. This is because a !null node can be created instead of a unique one describing the loop. In this case, the original node gets incorrectly updated with the NewLoopID metadata. In the case when the remainder loop is going to be quickly fully unrolled, there isn't the need to add loop metadata for it anyway. Differential Revision: https://reviews.llvm.org/D37338 llvm-svn: 312471
2017-09-04 16:12:16 +08:00
; RUN: opt -loop-unroll -unroll-runtime -unroll-allow-remainder -unroll-count=4 -unroll-remainder -S %s -o - | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@b = common local_unnamed_addr global i32 0, align 4, !dbg !0
@a = common local_unnamed_addr global i32* null, align 8, !dbg !6
; Test that loop remainder unrolling doesn't corrupt debuginfo. This example
; used to cause an assert, but also test that the unrolled backwards branches
; have the same DILocation.
; CHECK-LABEL: func_c
; CHECK-LABEL: for.body.lr.ph:
; CHECK: br i1 %[[CMP0:.*]], label %[[PRE:.*]], label %for.body.prol.loopexit, !dbg !24
; CHECK-LABEL: for.body:
; CHECK: br i1 %[[CMP1:.*]], label %[[CRIT_EDGE:.*]], label %for.body, !dbg !24, !llvm.loop !30
; CHECK-LABEL: for.cond.for.end_crit_edge:
; CHECK: br label %for.end, !dbg !24
; CHECK-LABEL: for.body.prol.1:
; CHECK: br i1 %[[CMP2:.*]], label %for.body.prol.2, label %[[EXIT:.*]], !dbg !24
; CHECK-LABEL: for.body.prol.2:
define i32 @func_c() local_unnamed_addr #0 !dbg !14 {
entry:
%.pr = load i32, i32* @b, align 4, !dbg !17, !tbaa !20
%tobool1 = icmp eq i32 %.pr, 0, !dbg !24
br i1 %tobool1, label %for.end, label %for.body.lr.ph, !dbg !24
for.body.lr.ph:
%a.promoted = load i32*, i32** @a, align 8, !dbg !25, !tbaa !26
%0 = sub i32 -2, %.pr, !dbg !24
%1 = and i32 %0, -2, !dbg !24
%2 = add i32 %.pr, %1, !dbg !24
br label %for.body, !dbg !24
for.body:
%3 = phi i32* [ %a.promoted, %for.body.lr.ph ], [ %6, %for.body ], !dbg !28
%4 = phi i32 [ %.pr, %for.body.lr.ph ], [ %add, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %3, i64 1, !dbg !28
%5 = load i32, i32* %arrayidx, align 4, !dbg !28, !tbaa !20
%conv = sext i32 %5 to i64, !dbg !28
%6 = inttoptr i64 %conv to i32*, !dbg !28
%add = add nsw i32 %4, 2, !dbg !29
%tobool = icmp eq i32 %add, 0, !dbg !24
br i1 %tobool, label %for.cond.for.end_crit_edge, label %for.body, !dbg !24, !llvm.loop !30
for.cond.for.end_crit_edge:
%7 = add i32 %2, 2, !dbg !24
store i32* %6, i32** @a, align 8, !dbg !25, !tbaa !26
store i32 %7, i32* @b, align 4, !dbg !32, !tbaa !20
br label %for.end, !dbg !24
for.end:
ret i32 undef, !dbg !33
}
; CHECK-LABEL: func_d
define void @func_d() local_unnamed_addr #1 !dbg !34 {
entry:
ret void, !dbg !37
}
attributes #0 = { norecurse nounwind uwtable }
attributes #0 = { norecurse nounwind readnone uwtable }
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!10, !11, !12}
!llvm.ident = !{!13}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 2, type: !9, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 6.0.0 (http://llvm.org/git/clang.git 044091b728654e62444a7ea10e6efb489c705bed) (http://llvm.org/git/llvm.git 1c7b55afdb1c5791e0557d9e32e2dd07c7acb2b0)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "loop.c", directory: "/work/projects/src/tests/unroll-debug-info")
!4 = !{}
!5 = !{!6, !0}
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!10 = !{i32 2, !"Dwarf Version", i32 4}
!11 = !{i32 2, !"Debug Info Version", i32 3}
!12 = !{i32 1, !"wchar_size", i32 4}
!13 = !{!"clang version 6.0.0 (http://llvm.org/git/clang.git 044091b728654e62444a7ea10e6efb489c705bed) (http://llvm.org/git/llvm.git 1c7b55afdb1c5791e0557d9e32e2dd07c7acb2b0)"}
!14 = distinct !DISubprogram(name: "c", scope: !3, file: !3, line: 3, type: !15, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !2, variables: !4)
!15 = !DISubroutineType(types: !16)
!16 = !{!9}
!17 = !DILocation(line: 4, column: 12, scope: !18)
!18 = distinct !DILexicalBlock(scope: !19, file: !3, line: 4, column: 5)
!19 = distinct !DILexicalBlock(scope: !14, file: !3, line: 4, column: 5)
!20 = !{!21, !21, i64 0}
!21 = !{!"int", !22, i64 0}
!22 = !{!"omnipotent char", !23, i64 0}
!23 = !{!"Simple C/C++ TBAA"}
!24 = !DILocation(line: 4, column: 5, scope: !19)
!25 = !DILocation(line: 5, column: 13, scope: !18)
!26 = !{!27, !27, i64 0}
!27 = !{!"any pointer", !22, i64 0}
!28 = !DILocation(line: 5, column: 15, scope: !18)
!29 = !DILocation(line: 4, column: 21, scope: !18)
!30 = distinct !{!30, !24, !31}
!31 = !DILocation(line: 5, column: 18, scope: !19)
!32 = !DILocation(line: 4, column: 17, scope: !18)
!33 = !DILocation(line: 6, column: 1, scope: !14)
!34 = distinct !DISubprogram(name: "d", scope: !3, file: !3, line: 7, type: !35, isLocal: false, isDefinition: true, scopeLine: 7, isOptimized: true, unit: !2, variables: !4)
!35 = !DISubroutineType(types: !36)
!36 = !{null}
!37 = !DILocation(line: 7, column: 11, scope: !34)