llvm/test/DebugInfo/ARM/instr-ref-tcreturn.ll

; RUN: llc %s -o - -stop-after=finalize-isel -verify-machineinstrs -experimental-debug-variable-locations | FileCheck %s

; In the sequence below, the sdiv is converted to a function call to __divsi3,
; which is then tail call optimised. The dbg.value is suddenly stuck between
; terminators, and the corresponding DBG_INSTR_REF is forced-placed to be
; immediately before the TCRETURN.
; However, with the function having the sspstrong attribute, we then try to
; peel apart the terminator sequence, DBG_INSTR_REF is interpreted as being
; a "real" instruction, and the stack check is inserted at that point rather
; than before the copies-to-physreg setting up the call. This breaks the
; code, and MachineVerifier complains.
;
; Check that the tail sequence is stack-protected, and split at the correct
; position, ignoring the DBG_INSTR_REF

target datalayout = "e-m:o-p:32:32-Fi8-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
target triple = "thumbv7-apple-ios7.0.0"

; CHECK-LABEL:  bb.0.entry:
; CHECK:        LOAD_STACK_GUARD

; CHECK-LABEL:  bb.2.entry:
; CHECK:        tBL {{.*}} &__stack_chk_fail,

; CHECK-LABEL:  bb.1.entry:
; CHECK:          $r0 = COPY %0
; CHECK-NEXT:     $r1 = COPY %1
; CHECK-NEXT:     DBG_INSTR_REF 1, 0
; CHECK-NEXT:     TCRETURNdi &__divsi3, 0, implicit $sp, implicit $r0, implicit $r1

declare i1 @ext()

define i32 @test(i32 %a1, i32 %a2) #1 !dbg !5 {
entry:
  %foo = alloca i32, i32 %a1
  %bool = call i1 @ext()
  %res = sdiv i32 %a1, %a2
  call void @llvm.dbg.value(metadata i32 %a1, metadata !13, metadata !DIExpression()), !dbg !16
  ret i32 %res
}

attributes #1 = {sspstrong}

; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}

!0 = distinct !DICompileUnit(language: DW_LANG_Swift, file: !1, producer: "Swift", isOptimized: true, runtimeVersion: 5, emissionKind: FullDebug)
!1 = !DIFile(filename: "foo.swift", directory: "/tmp")
!2 = !{}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"Swift Minor Version", i8 3}
!5 = distinct !DISubprogram(name: "n0", linkageName: "n1", scope: !7, file: !6, line: 86, type: !8, scopeLine: 86, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
!6 = !DIFile(filename: "bar.swift", directory: "")
!7 = !DIModule(scope: null, name: "Swift")
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !12}
!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Int", scope: !7, file: !11, size: 32, elements: !2, runtimeLang: DW_LANG_Swift, identifier: "$i1")
!11 = !DIFile(filename: "f1.swift", directory: "")
!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "n2", scope: !7, file: !6, size: 32, elements: !2, runtimeLang: DW_LANG_Swift, identifier: "n3")
!13 = !DILocalVariable(name: "n4", scope: !14, file: !1, line: 89, type: !15)
!14 = distinct !DILexicalBlock(scope: !5, file: !6, line: 86, column: 34)
!15 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !10)
!16 = !DILocation(line: 89, column: 9, scope: !14)