78 lines
3.9 KiB
LLVM
78 lines
3.9 KiB
LLVM
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; RUN: opt -S -dse -dse-memoryssa-scanlimit=2 < %s | FileCheck %s
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; RUN: opt -S -strip-debug -dse -dse-memoryssa-scanlimit=2 < %s | FileCheck %s
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; Test case to check that DSE gets the same result even if we have a dbg value
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; between the memcpy.
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; This test case is less relevant for the MemorySSA backed version of DSE, as
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; debug values are not modeled in MemorySSA and are skipped regardless of the
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; exploration limit.
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@g = common global [1 x i8] zeroinitializer, align 1, !dbg !0
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; Function Attrs: noinline nounwind uwtable
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define void @foo() #0 !dbg !14 {
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entry:
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%i = alloca i8, align 1
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store i8 1, i8* %i, align 1, !dbg !19
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !17, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !17, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !17, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !17, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !17, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !17, metadata !DIExpression()), !dbg !18
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%0 = bitcast [1 x i8]* @g to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %i, i8* %0, i64 1, i1 false), !dbg !20
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br label %bb2
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bb2: ; preds = %0
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ret void, !dbg !21
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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; Function Attrs: argmemonly nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #2
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attributes #0 = { noinline nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "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"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone speculatable }
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attributes #2 = { argmemonly nounwind }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10, !11, !12}
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!llvm.ident = !{!13}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "g", scope: !2, file: !3, line: 3, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 6.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "foo.c", directory: "/bar")
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!4 = !{}
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!5 = !{!0}
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!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 8, elements: !8)
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!7 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!8 = !{!9}
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!9 = !DISubrange(count: 1)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"wchar_size", i32 4}
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!13 = !{!"clang version 6.0.0"}
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!14 = distinct !DISubprogram(name: "foo", scope: !3, file: !3, line: 5, type: !15, isLocal: false, isDefinition: true, scopeLine: 6, isOptimized: false, unit: !2, retainedNodes: !4)
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!15 = !DISubroutineType(types: !16)
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!16 = !{null}
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!17 = !DILocalVariable(name: "i", scope: !14, file: !3, line: 7, type: !7)
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!18 = !DILocation(line: 7, column: 10, scope: !14)
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!19 = !DILocation(line: 8, column: 7, scope: !14)
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!20 = !DILocation(line: 9, column: 5, scope: !14)
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!21 = !DILocation(line: 10, column: 1, scope: !14)
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; Check that the both the store and memcpy are removed because they both access
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; an alloca that is not read.
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; CHECK-LABEL: foo
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; CHECK-NOT: store i8
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; CHECK-NOT: call void @llvm.memcpy
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; CHECK: ret void
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