test/Transforms/GlobalOpt/externally-initialized-global-ctr.ll

; RUN: opt < %s -passes=globalopt -S | FileCheck %s
; rdar://12580965.
; ObjC++ test case.

; Make it easier to verify that alignment is correct/optimal:
; 16-bit pointers with 32-bit ABI alignment and 128-bit preferred alignment

target datalayout = "p:16:32:128" 

%struct.ButtonInitData = type { ptr }

@_ZL14buttonInitData = internal global [1 x %struct.ButtonInitData] zeroinitializer, align 4

@"\01L_OBJC_METH_VAR_NAME_40" = internal global [7 x i8] c"print:\00", section "__TEXT,__objc_methname,cstring_literals", align 1
@"\01L_OBJC_SELECTOR_REFERENCES_41" = internal externally_initialized  global ptr @"\01L_OBJC_METH_VAR_NAME_40", section "__DATA, __objc_selrefs, literal_pointers, no_dead_strip"

@llvm.global_ctors = appending global [1 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 65535, ptr @_GLOBAL__I_a, ptr null }]
@llvm.used = appending global [2 x ptr] [ptr @"\01L_OBJC_METH_VAR_NAME_40",  ptr @"\01L_OBJC_SELECTOR_REFERENCES_41"]

; Choose the preferred alignment.

; CHECK: @[[_ZL14BUTTONINITDATA_0_0:[a-zA-Z0-9_$"\\.-]+]] = internal unnamed_addr global ptr null, align 16
;.
define internal void @__cxx_global_var_init() section "__TEXT,__StaticInit,regular,pure_instructions" {
  %1 = load ptr, ptr @"\01L_OBJC_SELECTOR_REFERENCES_41", !invariant.load !2009
  store ptr %1, ptr @_ZL14buttonInitData, align 4
  ret void
}

define internal void @_GLOBAL__I_a() section "__TEXT,__StaticInit,regular,pure_instructions" {
  call void @__cxx_global_var_init()
  ret void
}

declare void @test(ptr)

; The preferred alignment is available.

define void @print() {
; CHECK-LABEL: @print(
; CHECK-NEXT:    [[TMP1:%.*]] = load ptr, ptr @_ZL14buttonInitData.0, align 16
; CHECK-NEXT:    call void @test(ptr [[TMP1]])
; CHECK-NEXT:    ret void
;
  %1 = load ptr, ptr @_ZL14buttonInitData, align 4
  call void @test(ptr %1)
  ret void
}

!2009 = !{}