1; RUN: opt < %s -globalopt -S | FileCheck %s
2
3; Test the evaluation of a store and a load via a bitcast, and check
4; that globals are constant folded to the correct value.
5
6; CHECK: @u = dso_local local_unnamed_addr global %union.A { i8* inttoptr (i64 12345 to i8*) }, align 8
7; CHECK: @l = dso_local local_unnamed_addr global i64 12345, align 8
8
9; Test derived from:
10;
11; union A {
12;   A(long long ll) : l(ll) {}
13;   void *p;
14;   long long l;
15; } u(12345);
16;
17; long long l = u.l;
18
19target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
20target triple = "x86_64-unknown-linux-gnu"
21
22%union.A = type { i8* }
23
24$_ZN1AC2Ex = comdat any
25
26@u = dso_local global %union.A zeroinitializer, align 8
27@l = dso_local global i64 0, align 8
28@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_test.cpp, i8* null }]
29
30define internal void @__cxx_global_var_init() section ".text.startup" {
31  call void @_ZN1AC2Ex(%union.A* @u, i64 12345)
32  ret void
33}
34
35define linkonce_odr dso_local void @_ZN1AC2Ex(%union.A* %this, i64 %ll) unnamed_addr comdat align 2 {
36  %l = bitcast %union.A* %this to i64*
37  store i64 %ll, i64* %l, align 8
38  ret void
39}
40
41define internal void @__cxx_global_var_init.1() section ".text.startup" {
42  %1 = load i64, i64* bitcast (%union.A* @u to i64*), align 8
43  store i64 %1, i64* @l, align 8
44  ret void
45}
46
47define internal void @_GLOBAL__sub_I_test.cpp() section ".text.startup" {
48  call void @__cxx_global_var_init()
49  call void @__cxx_global_var_init.1()
50  ret void
51}
52