Index: llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
===================================================================
--- llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -2554,7 +2554,10 @@
         continue;
       }
 
-      if (isa<CallInst>(&*PrevInstIt) && &*PrevInstIt != PrevInst) {
+      // Debug informations don't impact spill cost.
+      if ((isa<CallInst>(&*PrevInstIt) &&
+           !isa<DbgInfoIntrinsic>(&*PrevInstIt)) &&
+          &*PrevInstIt != PrevInst) {
         SmallVector<Type*, 4> V;
         for (auto *II : LiveValues)
           V.push_back(VectorType::get(II->getType(), BundleWidth));
Index: llvm/test/Transforms/SLPVectorizer/AArch64/spillcost-di.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/SLPVectorizer/AArch64/spillcost-di.ll
@@ -0,0 +1,81 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+// Debug intrinsics shouldn't affect spill cost.
+
+// RUN: opt -S -slp-vectorizer %s | FileCheck %s
+
+// CHECK: %0 = bitcast i64* %x1 to <2 x i64>*, !dbg !26
+// CHECK: %1 = load <2 x i64>, <2 x i64>* %0, align 8, !dbg !26, !tbaa !29
+// CHECK: store <2 x i64> %1, <2 x i64>* %2, align 8, !dbg !36, !tbaa !29
+
+target triple = "aarch64"
+
+%struct.S = type { i64, i64 }
+
+define void @foo(i64 %n, i64 %i, %struct.S* %p) !dbg !7 {
+entry:
+  call void @llvm.dbg.value(metadata i64 %n, metadata !18, metadata !DIExpression()), !dbg !23
+  call void @llvm.dbg.value(metadata i64 %i, metadata !19, metadata !DIExpression()), !dbg !24
+  call void @llvm.dbg.value(metadata %struct.S* %p, metadata !20, metadata !DIExpression()), !dbg !25
+  %x1 = getelementptr inbounds %struct.S, %struct.S* %p, i64 %n, i32 0, !dbg !26
+  %0 = load i64, i64* %x1, align 8, !dbg !26, !tbaa !27
+  call void @llvm.dbg.value(metadata i64 %0, metadata !21, metadata !DIExpression()), !dbg !32
+  %y3 = getelementptr inbounds %struct.S, %struct.S* %p, i64 %n, i32 1, !dbg !33
+  %1 = load i64, i64* %y3, align 8, !dbg !33, !tbaa !34
+  call void @llvm.dbg.value(metadata i64 %1, metadata !22, metadata !DIExpression()), !dbg !35
+  %x5 = getelementptr inbounds %struct.S, %struct.S* %p, i64 %i, i32 0, !dbg !36
+  store i64 %0, i64* %x5, align 8, !dbg !37, !tbaa !27
+  %y7 = getelementptr inbounds %struct.S, %struct.S* %p, i64 %i, i32 1, !dbg !38
+  store i64 %1, i64* %y7, align 8, !dbg !39, !tbaa !34
+  ret void, !dbg !40
+}
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+
+attributes #1 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0 (trunk 330946) (llvm/trunk 330976)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "slp-reduced.c", directory: "/usr2/gberry/local/loop-align")
+!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 7.0.0 (trunk 330946) (llvm/trunk 330976)"}
+!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 6, type: !8, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !17)
+!8 = !DISubroutineType(types: !9)
+!9 = !{null, !10, !10, !11}
+!10 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
+!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
+!12 = !DIDerivedType(tag: DW_TAG_typedef, name: "S", file: !1, line: 4, baseType: !13)
+!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !1, line: 1, size: 128, elements: !14)
+!14 = !{!15, !16}
+!15 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !13, file: !1, line: 2, baseType: !10, size: 64)
+!16 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !13, file: !1, line: 3, baseType: !10, size: 64, offset: 64)
+!17 = !{!18, !19, !20, !21, !22}
+!18 = !DILocalVariable(name: "n", arg: 1, scope: !7, file: !1, line: 6, type: !10)
+!19 = !DILocalVariable(name: "i", arg: 2, scope: !7, file: !1, line: 6, type: !10)
+!20 = !DILocalVariable(name: "p", arg: 3, scope: !7, file: !1, line: 6, type: !11)
+!21 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 7, type: !10)
+!22 = !DILocalVariable(name: "y", scope: !7, file: !1, line: 8, type: !10)
+!23 = !DILocation(line: 6, column: 15, scope: !7)
+!24 = !DILocation(line: 6, column: 23, scope: !7)
+!25 = !DILocation(line: 6, column: 29, scope: !7)
+!26 = !DILocation(line: 7, column: 19, scope: !7)
+!27 = !{!28, !29, i64 0}
+!28 = !{!"", !29, i64 0, !29, i64 8}
+!29 = !{!"long", !30, i64 0}
+!30 = !{!"omnipotent char", !31, i64 0}
+!31 = !{!"Simple C/C++ TBAA"}
+!32 = !DILocation(line: 7, column: 10, scope: !7)
+!33 = !DILocation(line: 8, column: 19, scope: !7)
+!34 = !{!28, !29, i64 8}
+!35 = !DILocation(line: 8, column: 10, scope: !7)
+!36 = !DILocation(line: 9, column: 10, scope: !7)
+!37 = !DILocation(line: 9, column: 12, scope: !7)
+!38 = !DILocation(line: 10, column: 10, scope: !7)
+!39 = !DILocation(line: 10, column: 12, scope: !7)
+!40 = !DILocation(line: 11, column: 1, scope: !7)