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
45 lines
1.9 KiB
LLVM
45 lines
1.9 KiB
LLVM
; RUN: opt -disable-basic-aa -passes=loop-rotate -verify-memoryssa -S %s | FileCheck %s
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; REQUIRES: asserts
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; CHECK-LABEL: @f_w4_i2
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define void @f_w4_i2(i1 %arg) {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.body, %entry
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%i.0 = phi i16 [ 0, %entry ], [ %inc, %for.body ]
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call void @llvm.dbg.value(metadata i16 %i.0, metadata !32, metadata !DIExpression()), !dbg !31
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br i1 %arg, label %for.body, label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond
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ret void
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for.body: ; preds = %for.cond
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store i32 undef, ptr undef, align 1
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%inc = add i16 %i.0, 1
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call void @llvm.dbg.value(metadata i16 %inc, metadata !32, metadata !DIExpression()), !dbg !31
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br label %for.cond
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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 = !{!14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0s", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None)
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!1 = !DIFile(filename: "vec.c", directory: "test")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
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!14 = !{i32 2, !"Debug Info Version", i32 3}
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!15 = distinct !DISubprogram(name: "f_w4_i2", scope: !1, file: !1, line: 36, type: !16, scopeLine: 38, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !23)
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!16 = !DISubroutineType(types: !17)
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!17 = !{null}
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!23 = !{}
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!30 = distinct !DILexicalBlock(scope: !15, file: !1, line: 43, column: 5)
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!31 = !DILocation(line: 0, scope: !30)
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!32 = !DILocalVariable(name: "i", scope: !30, file: !1, line: 43, type: !4)
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