112 lines · plain
1; RUN: opt %s -passes=instcombine -S | FileCheck %s2 3; Test sinking of dbg.values when instcombine sinks associated instructions.4 5declare void @llvm.dbg.value(metadata, metadata, metadata)6 7; This GEP is sunk, but can be folded into a DIExpression. Check that it8; gets folded. The dbg.value should be duplicated in the block its sunk9; into, to maximise liveness.10;11; CHECK-LABEL: define i32 @foo(ptr12; CHECK: #dbg_value(ptr %a, !{{[0-9]+}},13; CHECK-SAME: !DIExpression(DW_OP_plus_uconst, 4, DW_OP_stack_value),14; CHECK-NEXT: br label %sink115 16define i32 @foo(ptr %a) !dbg !7 {17entry:18 %gep = getelementptr i32, ptr %a, i32 119 call void @llvm.dbg.value(metadata ptr %gep, metadata !16, metadata !12), !dbg !1520 br label %sink121 22sink1:23; CHECK-LABEL: sink1:24; CHECK: #dbg_value(ptr %gep,25; CHECK-SAME: !{{[0-9]+}}, !DIExpression(),26; CHECK-NEXT: load27 %0 = load i32, ptr %gep, align 4, !dbg !1528 ret i32 %0, !dbg !1529}30 31; In this example the GEP cannot (yet) be salvaged. Check that not only is the32; dbg.value sunk, but an undef dbg.value is left to terminate any earlier33; value range.34 35; CHECK-LABEL: define i32 @bar(36; CHECK: #dbg_value(ptr poison,37; CHECK-NEXT: br label %sink238 39define i32 @bar(ptr %a, i32 %b) !dbg !70 {40entry:41 %gep = getelementptr <vscale x 4 x i32>, ptr %a, i32 %b42 call void @llvm.dbg.value(metadata ptr %gep, metadata !73, metadata !12), !dbg !7443 br label %sink244 45sink2:46; CHECK-LABEL: sink2:47; CHECK: #dbg_value(ptr %gep,48; CHECK-SAME: !{{[0-9]+}}, !DIExpression(),49; CHECK-NEXT: load50; CHECK-NEXT: extractelement51; CHECK-NEXT: ret52 %0 = load <vscale x 4 x i32>, ptr %gep53 %extract = extractelement <vscale x 4 x i32> %0, i32 154 ret i32 %extract55}56 57; This GEP is sunk, and has multiple debug uses in the same block. Check that58; only the last use is cloned into the sunk block, and that both of the59; original dbg.values are salvaged.60;61; CHECK-LABEL: define i32 @baz(ptr62; CHECK: #dbg_value(ptr %a, !{{[0-9]+}},63; CHECK-SAME: !DIExpression(DW_OP_plus_uconst, 4, DW_OP_stack_value),64; CHECK-NEXT: #dbg_value(ptr %a, !{{[0-9]+}},65; CHECK-SAME: !DIExpression(DW_OP_plus_uconst, 9, DW_OP_stack_value),66; CHECK-NEXT: br label %sink167 68define i32 @baz(ptr %a) !dbg !80 {69entry:70 %gep = getelementptr i32, ptr %a, i32 171 call void @llvm.dbg.value(metadata ptr %gep, metadata !83, metadata !12), !dbg !8472 call void @llvm.dbg.value(metadata ptr %gep, metadata !83, metadata !DIExpression(DW_OP_plus_uconst, 5)), !dbg !8573 br label %sink174 75sink1:76; CHECK-LABEL: sink1:77; CHECK: #dbg_value(ptr %gep,78; CHECK-SAME: !{{[0-9]+}}, !DIExpression(DW_OP_plus_uconst, 5),79; CHECK-NEXT: load80 %0 = load i32, ptr %gep, align 4, !dbg !8581 ret i32 %0, !dbg !8582}83 84!llvm.dbg.cu = !{!0}85!llvm.module.flags = !{!3, !4, !5}86!llvm.ident = !{!6}87 88!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)89!1 = !DIFile(filename: "a.c", directory: ".")90!2 = !{}91!3 = !{i32 2, !"Dwarf Version", i32 4}92!4 = !{i32 2, !"Debug Info Version", i32 3}93!5 = !{i32 1, !"PIC Level", i32 2}94!6 = !{!"clang"}95!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)96!8 = !DISubroutineType(types: !9)97!9 = !{!10, !10}98!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)99!11 = !DILocalVariable(name: "j", scope: !7, file: !1, line: 2, type: !10)100!12 = !DIExpression()101!15 = !DILocation(line: 5, column: 3, scope: !7)102!16 = !DILocalVariable(name: "h", scope: !7, file: !1, line: 4, type: !10)103!70 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 2, type: !71, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)104!71 = !DISubroutineType(types: !72)105!72 = !{!10, !10, !10}106!73 = !DILocalVariable(name: "k", scope: !70, file: !1, line: 2, type: !10)107!74 = !DILocation(line: 5, column: 3, scope: !70)108!80 = distinct !DISubprogram(name: "baz", scope: !1, file: !1, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)109!83 = !DILocalVariable(name: "l", scope: !80, file: !1, line: 2, type: !10)110!84 = !DILocation(line: 5, column: 3, scope: !80)111!85 = !DILocation(line: 6, column: 3, scope: !80)112