1469d82e1c
As defined in LangRef, branching on `undef` is undefined behavior. This PR aims to remove undefined behavior from tests. As UB tests break Alive2 and may be the root cause of breaking future optimizations. Here's an Alive2 proof for one of the examples: https://alive2.llvm.org/ce/z/TncxhP
55 lines
2.4 KiB
LLVM
55 lines
2.4 KiB
LLVM
; RUN: opt -passes='print<memoryssa>' -disable-output %s 2>&1 | FileCheck %s
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; Note that the test crashes the MemorySSA verification when doing loop-rotate,
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; if debuginfo is modelled in MemorySSA, due to the fact that MemorySSA is not
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; updated when adding/removing debuginfo intrinsics.
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK-LABEL: @overflow_iter_var
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; CHECK-NOT: MemoryDef
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define void @overflow_iter_var(i1 %arg) !dbg !11 {
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entry:
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call void @llvm.dbg.value(metadata i16 0, metadata !16, metadata !DIExpression()), !dbg !18
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br label %for.cond
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for.cond: ; preds = %for.body, %entry
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call void @llvm.dbg.value(metadata i16 0, metadata !16, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i16 undef, metadata !20, metadata !DIExpression()), !dbg !21
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br i1 %arg, label %for.end, label %for.body
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for.body: ; preds = %for.cond
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%0 = load i16, ptr undef, align 1
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br label %for.cond
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for.end: ; preds = %for.cond
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ret void
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #1 = { nounwind readnone speculatable willreturn }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3, nameTableKind: None)
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!1 = !DIFile(filename: "2_loops.c", directory: "/")
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!2 = !{}
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!3 = !{}
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!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 4096, elements: !8)
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!7 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
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!8 = !{!9}
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!9 = !DISubrange(count: 256)
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!10 = !{i32 2, !"Debug Info Version", i32 3}
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!11 = distinct !DISubprogram(name: "overflow_iter_var", scope: !1, file: !1, line: 20, type: !12, scopeLine: 21, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null, !14, !14}
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!14 = !DIBasicType(name: "unsigned int", size: 16, encoding: DW_ATE_unsigned)
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!16 = !DILocalVariable(name: "i", scope: !17, file: !1, line: 23, type: !14)
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!17 = distinct !DILexicalBlock(scope: !11, file: !1, line: 23, column: 3)
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!18 = !DILocation(line: 0, scope: !17)
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!20 = !DILocalVariable(name: "stop1", arg: 1, scope: !11, file: !1, line: 20, type: !14)
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!21 = !DILocation(line: 0, scope: !11)
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