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