69 lines · plain
1; RUN: llc -start-before=codegenprepare -stop-after=codegenprepare -mtriple=x86_64-unknown-unknown %s -o - | FileCheck %s2;3; CGP duplicates address calculation into each basic block that contains loads4; or stores, so that they can be folded into instruction memory operands for5; example. dbg.value's should be redirected to identify such local address6; computations, to give the best opportunity for variable locations to be7; preserved.8; This test has two dbg.values in it, one before and one after the relevant9; memory instruction. Test that the one before does _not_ get updated (as that10; would either make it use-before-def or shift when the variable appears), and11; that the dbg.value after the memory instruction does get updated.12 13define dso_local i8 @foo(ptr %p, i32 %cond) !dbg !7 {14entry:15; There should be no dbg.values in this block.16; CHECK-LABEL: entry:17; CHECK-NOT: #dbg_value18 %arith = getelementptr i8, ptr %p, i32 319 %load1 = load i8, ptr %arith20 %cmpresult = icmp eq i32 %cond, 021 br i1 %cmpresult, label %next, label %ret22 23next:24; Address calcs should be duplicated into this block. One dbg.value should be25; updated, and the other should not.26; CHECK-LABEL: next:27; CHECK: #dbg_value(ptr %arith, ![[DIVAR:[0-9]+]],28; CHECK-SAME: !DIExpression()29; CHECK-NEXT: %[[GEPVAR:[0-9a-zA-Z]+]] = getelementptr i8, ptr %p,30; CHECK-SAME: i64 331; CHECK-NEXT: %loaded = load i8, ptr %[[GEPVAR]]32; CHECK-NEXT: #dbg_value(ptr %[[GEPVAR]],33; CHECK-SAME: ![[DIVAR]],34; CHECK-NEXT: #dbg_value(!DIArgList(ptr %[[GEPVAR]],35; CHECK-SAME: ptr %[[GEPVAR]]), ![[DIVAR]],36 call void @llvm.dbg.value(metadata ptr %arith, metadata !12, metadata !DIExpression()), !dbg !1437 %loaded = load i8, ptr %arith38 call void @llvm.dbg.value(metadata ptr %arith, metadata !12, metadata !DIExpression()), !dbg !1439 call void @llvm.dbg.value(metadata !DIArgList(ptr %arith, ptr %arith), metadata !12, metadata !DIExpression()), !dbg !1440 ret i8 %loaded41 42ret:43 ret i8 044}45 46; CHECK: ![[DIVAR]] = !DILocalVariable(name: "p",47 48declare void @llvm.dbg.value(metadata, metadata, metadata)49 50!llvm.dbg.cu = !{!0}51!llvm.module.flags = !{!3, !4, !5}52!llvm.ident = !{!6}53 54!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)55!1 = !DIFile(filename: "test.cpp", directory: ".")56!2 = !{}57!3 = !{i32 2, !"Dwarf Version", i32 4}58!4 = !{i32 2, !"Debug Info Version", i32 3}59!5 = !{i32 1, !"wchar_size", i32 4}60!6 = !{!"clang version 8.0.0 (trunk 348209)"}61!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)62!8 = !DISubroutineType(types: !9)63!9 = !{null, !10}64!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)65!11 = !{!12}66!12 = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 4, type: !10)67!14 = !DILocation(line: 4, column: 15, scope: !7)68!20 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)69