| ; RUN: opt < %s -passes=globalopt -S | FileCheck %s |
| |
| ; Test the evaluation of a store and a load via a bitcast, and check |
| ; that globals are constant folded to the correct value. |
| |
| ; CHECK: @u = dso_local local_unnamed_addr global %union.A { i8* inttoptr (i64 12345 to i8*) }, align 8 |
| ; CHECK: @l = dso_local local_unnamed_addr global i64 12345, align 8 |
| |
| ; Test derived from: |
| ; |
| ; union A { |
| ; A(long long ll) : l(ll) {} |
| ; void *p; |
| ; long long l; |
| ; } u(12345); |
| ; |
| ; long long l = u.l; |
| |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| %union.A = type { i8* } |
| |
| $_ZN1AC2Ex = comdat any |
| |
| @u = dso_local global %union.A zeroinitializer, align 8 |
| @l = dso_local global i64 0, align 8 |
| @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_test.cpp, i8* null }] |
| |
| define internal void @__cxx_global_var_init() section ".text.startup" { |
| call void @_ZN1AC2Ex(%union.A* @u, i64 12345) |
| ret void |
| } |
| |
| define linkonce_odr dso_local void @_ZN1AC2Ex(%union.A* %this, i64 %ll) unnamed_addr comdat align 2 { |
| %l = bitcast %union.A* %this to i64* |
| store i64 %ll, i64* %l, align 8 |
| ret void |
| } |
| |
| define internal void @__cxx_global_var_init.1() section ".text.startup" { |
| %1 = load i64, i64* bitcast (%union.A* @u to i64*), align 8 |
| store i64 %1, i64* @l, align 8 |
| ret void |
| } |
| |
| define internal void @_GLOBAL__sub_I_test.cpp() section ".text.startup" { |
| call void @__cxx_global_var_init() |
| call void @__cxx_global_var_init.1() |
| ret void |
| } |