; RUN: opt < %s -basicaa -inline -instcombine -reassociate -dse -disable-output
; PR12245

@a = common global i32 0, align 4
@d = common global i32 0, align 4

define i32 @fn2() nounwind uwtable ssp {
entry:
  %0 = load i32* @a, align 4, !tbaa !0
  %dec = add nsw i32 %0, -1
  store i32 %dec, i32* @a, align 4, !tbaa !0
  %1 = load i32* @d, align 4, !tbaa !0
  %sub = sub nsw i32 %dec, %1
  store i32 %sub, i32* @d, align 4, !tbaa !0
  %2 = load i32* @a, align 4, !tbaa !0
  %dec1 = add nsw i32 %2, -1
  store i32 %dec1, i32* @a, align 4, !tbaa !0
  %3 = load i32* @d, align 4, !tbaa !0
  %sub2 = sub nsw i32 %dec1, %3
  store i32 %sub2, i32* @d, align 4, !tbaa !0
  %4 = load i32* @a, align 4, !tbaa !0
  %dec3 = add nsw i32 %4, -1
  store i32 %dec3, i32* @a, align 4, !tbaa !0
  %5 = load i32* @d, align 4, !tbaa !0
  %sub4 = sub nsw i32 %dec3, %5
  store i32 %sub4, i32* @d, align 4, !tbaa !0
  %6 = load i32* @a, align 4, !tbaa !0
  %dec5 = add nsw i32 %6, -1
  store i32 %dec5, i32* @a, align 4, !tbaa !0
  %7 = load i32* @d, align 4, !tbaa !0
  %sub6 = sub nsw i32 %dec5, %7
  store i32 %sub6, i32* @d, align 4, !tbaa !0
  %8 = load i32* @a, align 4, !tbaa !0
  %dec7 = add nsw i32 %8, -1
  store i32 %dec7, i32* @a, align 4, !tbaa !0
  %9 = load i32* @d, align 4, !tbaa !0
  %sub8 = sub nsw i32 %dec7, %9
  store i32 %sub8, i32* @d, align 4, !tbaa !0
  ret i32 0
}

define i32 @fn1() nounwind uwtable ssp {
entry:
  %call = call i32 @fn2()
  ret i32 %call
}

!0 = metadata !{metadata !"int", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA"}