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llvm-project/llvm/test/CodeGen/Mips/pr34975.ll

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[DebugInfo] Don't insert DEBUG_VALUE after terminators r314974 introduced insertion of DEBUG_VALUEs after each redefinition of debug value register in the slot index range. In case the instruction redefining the debug value register was a terminator, machine verifier would complain since it enforces the rule of no non-terminator instructions following the first terminator. Differential Revision: https://reviews.llvm.org/D42801 llvm-svn: 324734
2018-02-09 22:03:26 +08:00
; RUN: llc -mtriple=mips64-unknown-freebsd -target-abi n64 -relocation-model pic -verify-machineinstrs -o /dev/null %s -O2
[mips] Fix analyzeBranch to handle debug data In the case where there was a conditional branch followed by a unconditional branch with debug instruction separating them, MipsInstrInfo::analyzeBranch would not skip past debug instruction when searching for the second branch which give erroneous results about the control flow of the block. This could lead to the branch folder to merge the non-fall through case into it's predecessor, leaving the conditional branch with a dangling basic block operand. This resolves PR34975. Thanks to Alexander Richardson for reporting the issue! Reviewers: atanasyan Differential Revision: https://reviews.llvm.org/D39003 llvm-svn: 316084
2017-10-18 22:35:29 +08:00
; Test that the presence of debug information does not cause the branch folder
; to rewrite branches to have negative basic block ids, which would cause the
; long branch pass to crash.
@c = external global i32, align 4
define void @e() !dbg !19 {
entry:
%0 = load i32, i32* @c, align 4, !dbg !28, !tbaa !31
%tobool8 = icmp eq i32 %0, 0, !dbg !35
br i1 %tobool8, label %for.end, label %for.body.preheader, !dbg !35
for.body.preheader: ; preds = %entry
br label %for.body, !dbg !36
for.body: ; preds = %for.body.preheader
%1 = load i8, i8* undef, align 1, !dbg !36, !tbaa !38
%conv = zext i8 %1 to i32, !dbg !36
%cmp = icmp sgt i32 %0, %conv, !dbg !39
br i1 %cmp, label %if.end, label %if.then, !dbg !40
if.then: ; preds = %for.body
tail call void @llvm.dbg.value(metadata i32 %conv, metadata !41, metadata !DIExpression()), !dbg !43
%idxprom5 = zext i8 %1 to i64, !dbg !44
%call = tail call i32 bitcast (i32 (...)* @g to i32 (i32)*)(i32 signext undef) #3, !dbg !45
br label %if.end, !dbg !46
if.end: ; preds = %if.then, %for.body
unreachable
for.end: ; preds = %entry
ret void
}
declare i32 @g(...)
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!17, !18}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)
!1 = !DIFile(filename: "/local/scratch/alr48/cheri/llvm/tools/clang/test/CodeGen/<stdin>", directory: "/local/scratch/alr48/cheri/llvm/cmake-build-debug/tools/clang/test/CodeGen")
!2 = !{}
!3 = !{!4, !9, !13, !15}
!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
!5 = distinct !DIGlobalVariable(name: "a", scope: !0, file: !6, line: 6, type: !7, isLocal: false, isDefinition: true)
!6 = !DIFile(filename: "/crash.c", directory: "/tmp")
!7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
!8 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
!10 = distinct !DIGlobalVariable(name: "b", scope: !0, file: !6, line: 7, type: !11, isLocal: false, isDefinition: true)
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !DIGlobalVariableExpression(var: !14, expr: !DIExpression())
!14 = distinct !DIGlobalVariable(name: "c", scope: !0, file: !6, line: 8, type: !12, isLocal: false, isDefinition: true)
!15 = !DIGlobalVariableExpression(var: !16, expr: !DIExpression())
!16 = distinct !DIGlobalVariable(name: "d", scope: !0, file: !6, line: 8, type: !12, isLocal: false, isDefinition: true)
!17 = !{i32 2, !"Debug Info Version", i32 3}
!18 = !{i32 7, !"PIC Level", i32 2}
!19 = distinct !DISubprogram(name: "e", scope: !6, file: !6, line: 9, type: !20, isLocal: false, isDefinition: true, scopeLine: 9, isOptimized: true, unit: !0, variables: !22)
!20 = !DISubroutineType(types: !21)
!21 = !{!12}
!22 = !{!23}
!23 = !DILocalVariable(name: "f", scope: !24, file: !6, line: 12, type: !12)
!24 = distinct !DILexicalBlock(scope: !25, file: !6, line: 11, column: 20)
!25 = distinct !DILexicalBlock(scope: !26, file: !6, line: 11, column: 9)
!26 = distinct !DILexicalBlock(scope: !27, file: !6, line: 10, column: 3)
!27 = distinct !DILexicalBlock(scope: !19, file: !6, line: 10, column: 3)
!28 = !DILocation(line: 10, column: 10, scope: !29)
!29 = distinct !DILexicalBlock(scope: !30, file: !6, line: 10, column: 3)
!30 = distinct !DILexicalBlock(scope: !19, file: !6, line: 10, column: 3)
!31 = !{!32, !32, i64 0}
!32 = !{!"int", !33, i64 0}
!33 = !{!"omnipotent char", !34, i64 0}
!34 = !{!"Simple C/C++ TBAA"}
!35 = !DILocation(line: 10, column: 3, scope: !30)
!36 = !DILocation(line: 11, column: 9, scope: !37)
!37 = distinct !DILexicalBlock(scope: !29, file: !6, line: 11, column: 9)
!38 = !{!33, !33, i64 0}
!39 = !DILocation(line: 11, column: 14, scope: !37)
!40 = !DILocation(line: 11, column: 9, scope: !29)
!41 = !DILocalVariable(name: "f", scope: !42, file: !6, line: 12, type: !12)
!42 = distinct !DILexicalBlock(scope: !37, file: !6, line: 11, column: 20)
!43 = !DILocation(line: 12, column: 11, scope: !42)
!44 = !DILocation(line: 13, column: 9, scope: !42)
!45 = !DILocation(line: 13, column: 7, scope: !42)
!46 = !DILocation(line: 14, column: 5, scope: !42)