68 lines
3.1 KiB
LLVM
68 lines
3.1 KiB
LLVM
; RUN: llc -start-before=codegenprepare -stop-after=codegenprepare -mtriple=x86_64-unknown-unknown %s -o - | FileCheck %s
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;
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; CGP duplicates address calculation into each basic block that contains loads
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; or stores, so that they can be folded into instruction memory operands for
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; example. dbg.value's should be redirected to identify such local address
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; computations, to give the best opportunity for variable locations to be
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; preserved.
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; This test has two dbg.values in it, one before and one after the relevant
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; memory instruction. Test that the one before does _not_ get updated (as that
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; would either make it use-before-def or shift when the variable appears), and
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; that the dbg.value after the memory instruction does get updated.
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define dso_local i8 @foo(i32 *%p, i32 %cond) !dbg !7 {
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entry:
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; There should be no dbg.values in this block.
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; CHECK-LABEL: entry:
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; CHECK-NOT: dbg.value
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%casted = bitcast i32 *%p to i8*
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%arith = getelementptr i8, i8 *%casted, i32 3
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%load1 = load i8, i8 *%arith
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%cmpresult = icmp eq i32 %cond, 0
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br i1 %cmpresult, label %next, label %ret
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next:
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; Address calcs should be duplicated into this block. One dbg.value should be
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; updated, and the other should not.
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; CHECK-LABEL: next:
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; CHECK: dbg.value(metadata i8* %arith, metadata ![[DIVAR:[0-9]+]],
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; CHECK-SAME: metadata !DIExpression()
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; CHECK-NEXT: %[[CASTVAR:[0-9a-zA-Z]+]] = bitcast i32* %p to i8*
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; CHECK-NEXT: %[[GEPVAR:[0-9a-zA-Z]+]] = getelementptr i8, i8* %[[CASTVAR]],
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; CHECK-SAME: i64 3
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; CHECK-NEXT: %loaded = load i8, i8* %[[GEPVAR]]
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i8* %[[GEPVAR]],
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; CHECK-SAME: metadata ![[DIVAR]],
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call void @llvm.dbg.value(metadata i8 *%arith, metadata !12, metadata !DIExpression()), !dbg !14
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%loaded = load i8, i8 *%arith
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call void @llvm.dbg.value(metadata i8 *%arith, metadata !12, metadata !DIExpression()), !dbg !14
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ret i8 %loaded
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ret:
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ret i8 0
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}
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; CHECK: ![[DIVAR]] = !DILocalVariable(name: "p",
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "test.cpp", directory: ".")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 8.0.0 (trunk 348209)"}
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!7 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: !1, file: !1, line: 4, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!12}
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!12 = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 4, type: !10)
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!14 = !DILocation(line: 4, column: 15, scope: !7)
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!20 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)
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