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1; RUN: llc %s -o - -stop-after=finalize-isel -verify-machineinstrs -experimental-debug-variable-locations | FileCheck %s2 3; In the sequence below, the sdiv is converted to a function call to __divsi3,4; which is then tail call optimised. The dbg.value is suddenly stuck between5; terminators, and the corresponding DBG_INSTR_REF is forced-placed to be6; immediately before the TCRETURN.7; However, with the function having the sspstrong attribute, we then try to8; peel apart the terminator sequence, DBG_INSTR_REF is interpreted as being9; a "real" instruction, and the stack check is inserted at that point rather10; than before the copies-to-physreg setting up the call. This breaks the11; code, and MachineVerifier complains.12;13; Check that the tail sequence is stack-protected, and split at the correct14; position, ignoring the DBG_INSTR_REF15 16target datalayout = "e-m:o-p:32:32-Fi8-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"17target triple = "thumbv7-apple-ios7.0.0"18 19; CHECK-LABEL: bb.0.entry:20; CHECK: LOAD_STACK_GUARD21 22; CHECK-LABEL: bb.2.entry:23; CHECK: tBL {{.*}} &__stack_chk_fail,24 25; CHECK-LABEL: bb.1.entry:26; CHECK: $r0 = COPY %027; CHECK-NEXT: $r1 = COPY %128; CHECK-NEXT: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)29; CHECK-NEXT: TCRETURNdi &__divsi3, 0, csr_ios, implicit $sp, implicit $r0, implicit $r130 31declare i1 @ext()32 33define i32 @test(i32 %a1, i32 %a2) #1 !dbg !5 {34entry:35 %foo = alloca i32, i32 %a136 %bool = call i1 @ext()37 %res = sdiv i32 %a1, %a238 call void @llvm.dbg.value(metadata i32 %a1, metadata !13, metadata !DIExpression()), !dbg !1639 ret i32 %res40}41 42attributes #1 = {sspstrong}43 44; Function Attrs: nounwind readnone speculatable willreturn45declare void @llvm.dbg.value(metadata, metadata, metadata)46 47!llvm.dbg.cu = !{!0}48!llvm.module.flags = !{!3, !4}49 50!0 = distinct !DICompileUnit(language: DW_LANG_Swift, file: !1, producer: "Swift", isOptimized: true, runtimeVersion: 5, emissionKind: FullDebug)51!1 = !DIFile(filename: "foo.swift", directory: "/tmp")52!2 = !{}53!3 = !{i32 2, !"Debug Info Version", i32 3}54!4 = !{i32 1, !"Swift Minor Version", i8 3}55!5 = distinct !DISubprogram(name: "n0", linkageName: "n1", scope: !7, file: !6, line: 86, type: !8, scopeLine: 86, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)56!6 = !DIFile(filename: "bar.swift", directory: "")57!7 = !DIModule(scope: null, name: "Swift")58!8 = !DISubroutineType(types: !9)59!9 = !{!10, !12}60!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Int", scope: !7, file: !11, size: 32, elements: !2, runtimeLang: DW_LANG_Swift, identifier: "$i1")61!11 = !DIFile(filename: "f1.swift", directory: "")62!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "n2", scope: !7, file: !6, size: 32, elements: !2, runtimeLang: DW_LANG_Swift, identifier: "n3")63!13 = !DILocalVariable(name: "n4", scope: !14, file: !1, line: 89, type: !15)64!14 = distinct !DILexicalBlock(scope: !5, file: !6, line: 86, column: 34)65!15 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !10)66!16 = !DILocation(line: 89, column: 9, scope: !14)67