Home | History | Annotate | Download | only in CodeGenCXX 
      1 // RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-linux | FileCheck -check-prefix LINUX %s
      2 // RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 -mconstructor-aliases -fno-rtti | FileCheck -check-prefix WIN32 %s
      3 // RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-pc-win32 -mconstructor-aliases -fno-rtti | FileCheck -check-prefix WIN64 %s
      4 
      5 struct Empty {};
      6 
      7 struct EmptyWithCtor {
      8   EmptyWithCtor() {}
      9 };
     10 
     11 struct Small {
     12   int x;
     13 };
     14 
     15 // This is a C++11 trivial and standard-layout struct but not a C++03 POD.
     16 struct SmallCpp11NotCpp03Pod : Empty {
     17   int x;
     18 };
     19 
     20 struct SmallWithCtor {
     21   SmallWithCtor() {}
     22   int x;
     23 };
     24 
     25 struct SmallWithDtor {
     26   SmallWithDtor();
     27   ~SmallWithDtor();
     28   int x;
     29 };
     30 
     31 struct SmallWithVftable {
     32   int x;
     33   virtual void foo();
     34 };
     35 
     36 struct Medium {
     37   int x, y;
     38 };
     39 
     40 struct MediumWithCopyCtor {
     41   MediumWithCopyCtor();
     42   MediumWithCopyCtor(const struct MediumWithCopyCtor &);
     43   int x, y;
     44 };
     45 
     46 struct Big {
     47   int a, b, c, d, e, f;
     48 };
     49 
     50 struct BigWithDtor {
     51   BigWithDtor();
     52   ~BigWithDtor();
     53   int a, b, c, d, e, f;
     54 };
     55 
     56 // WIN32: declare void @"{{.*take_bools_and_chars.*}}"
     57 // WIN32:       (<{ i8, [3 x i8], i8, [3 x i8], %struct.SmallWithDtor,
     58 // WIN32:           i8, [3 x i8], i8, [3 x i8], i32, i8, [3 x i8] }>* inalloca)
     59 void take_bools_and_chars(char a, char b, SmallWithDtor c, char d, bool e, int f, bool g);
     60 void call_bools_and_chars() {
     61   take_bools_and_chars('A', 'B', SmallWithDtor(), 'D', true, 13, false);
     62 }
     63 
     64 // Returning structs that fit into a register.
     65 Small small_return() { return Small(); }
     66 // LINUX-LABEL: define void @_Z12small_returnv(%struct.Small* noalias sret %agg.result)
     67 // WIN32: define i32 @"\01?small_return@@YA?AUSmall@@XZ"()
     68 // WIN64: define i32 @"\01?small_return@@YA?AUSmall@@XZ"()
     69 
     70 Medium medium_return() { return Medium(); }
     71 // LINUX-LABEL: define void @_Z13medium_returnv(%struct.Medium* noalias sret %agg.result)
     72 // WIN32: define i64 @"\01?medium_return@@YA?AUMedium@@XZ"()
     73 // WIN64: define i64 @"\01?medium_return@@YA?AUMedium@@XZ"()
     74 
     75 // Returning structs that fit into a register but are not POD.
     76 SmallCpp11NotCpp03Pod small_non_pod_return() { return SmallCpp11NotCpp03Pod(); }
     77 // LINUX-LABEL: define void @_Z20small_non_pod_returnv(%struct.SmallCpp11NotCpp03Pod* noalias sret %agg.result)
     78 // WIN32: define void @"\01?small_non_pod_return@@YA?AUSmallCpp11NotCpp03Pod@@XZ"(%struct.SmallCpp11NotCpp03Pod* noalias sret %agg.result)
     79 // WIN64: define void @"\01?small_non_pod_return@@YA?AUSmallCpp11NotCpp03Pod@@XZ"(%struct.SmallCpp11NotCpp03Pod* noalias sret %agg.result)
     80 
     81 SmallWithCtor small_with_ctor_return() { return SmallWithCtor(); }
     82 // LINUX-LABEL: define void @_Z22small_with_ctor_returnv(%struct.SmallWithCtor* noalias sret %agg.result)
     83 // WIN32: define void @"\01?small_with_ctor_return@@YA?AUSmallWithCtor@@XZ"(%struct.SmallWithCtor* noalias sret %agg.result)
     84 // WIN64: define void @"\01?small_with_ctor_return@@YA?AUSmallWithCtor@@XZ"(%struct.SmallWithCtor* noalias sret %agg.result)
     85 
     86 SmallWithVftable small_with_vftable_return() { return SmallWithVftable(); }
     87 // LINUX-LABEL: define void @_Z25small_with_vftable_returnv(%struct.SmallWithVftable* noalias sret %agg.result)
     88 // WIN32: define void @"\01?small_with_vftable_return@@YA?AUSmallWithVftable@@XZ"(%struct.SmallWithVftable* noalias sret %agg.result)
     89 // WIN64: define void @"\01?small_with_vftable_return@@YA?AUSmallWithVftable@@XZ"(%struct.SmallWithVftable* noalias sret %agg.result)
     90 
     91 MediumWithCopyCtor medium_with_copy_ctor_return() { return MediumWithCopyCtor(); }
     92 // LINUX-LABEL: define void @_Z28medium_with_copy_ctor_returnv(%struct.MediumWithCopyCtor* noalias sret %agg.result)
     93 // WIN32: define void @"\01?medium_with_copy_ctor_return@@YA?AUMediumWithCopyCtor@@XZ"(%struct.MediumWithCopyCtor* noalias sret %agg.result)
     94 // WIN64: define void @"\01?medium_with_copy_ctor_return@@YA?AUMediumWithCopyCtor@@XZ"(%struct.MediumWithCopyCtor* noalias sret %agg.result)
     95 
     96 // Returning a large struct that doesn't fit into a register.
     97 Big big_return() { return Big(); }
     98 // LINUX-LABEL: define void @_Z10big_returnv(%struct.Big* noalias sret %agg.result)
     99 // WIN32: define void @"\01?big_return@@YA?AUBig@@XZ"(%struct.Big* noalias sret %agg.result)
    100 // WIN64: define void @"\01?big_return@@YA?AUBig@@XZ"(%struct.Big* noalias sret %agg.result)
    101 
    102 
    103 void small_arg(Small s) {}
    104 // LINUX-LABEL: define void @_Z9small_arg5Small(i32 %s.0)
    105 // WIN32: define void @"\01?small_arg@@YAXUSmall@@@Z"(%struct.Small* byval align 4 %s)
    106 // WIN64: define void @"\01?small_arg@@YAXUSmall@@@Z"(i32 %s.coerce)
    107 
    108 void medium_arg(Medium s) {}
    109 // LINUX-LABEL: define void @_Z10medium_arg6Medium(i32 %s.0, i32 %s.1)
    110 // WIN32: define void @"\01?medium_arg@@YAXUMedium@@@Z"(%struct.Medium* byval align 4 %s)
    111 // WIN64: define void @"\01?medium_arg@@YAXUMedium@@@Z"(i64 %s.coerce)
    112 
    113 void small_arg_with_ctor(SmallWithCtor s) {}
    114 // LINUX-LABEL: define void @_Z19small_arg_with_ctor13SmallWithCtor(%struct.SmallWithCtor* byval align 4 %s)
    115 // WIN32: define void @"\01?small_arg_with_ctor@@YAXUSmallWithCtor@@@Z"(%struct.SmallWithCtor* byval align 4 %s)
    116 // WIN64: define void @"\01?small_arg_with_ctor@@YAXUSmallWithCtor@@@Z"(i32 %s.coerce)
    117 
    118 // Test that dtors are invoked in the callee.
    119 void small_arg_with_dtor(SmallWithDtor s) {}
    120 // WIN32: define void @"\01?small_arg_with_dtor@@YAXUSmallWithDtor@@@Z"(<{ %struct.SmallWithDtor }>* inalloca) {{.*}} {
    121 // WIN32:   call x86_thiscallcc void @"\01??1SmallWithDtor@@QAE@XZ"
    122 // WIN32: }
    123 // WIN64: define void @"\01?small_arg_with_dtor@@YAXUSmallWithDtor@@@Z"(i32 %s.coerce) {{.*}} {
    124 // WIN64:   call void @"\01??1SmallWithDtor@@QEAA@XZ"
    125 // WIN64: }
    126 
    127 void call_small_arg_with_dtor() {
    128   small_arg_with_dtor(SmallWithDtor());
    129 }
    130 // The temporary is copied, so it's destroyed in the caller as well as the
    131 // callee.
    132 // WIN64-LABEL: define void @"\01?call_small_arg_with_dtor@@YAXXZ"()
    133 // WIN64:   call %struct.SmallWithDtor* @"\01??0SmallWithDtor@@QEAA@XZ"
    134 // WIN64:   call void @"\01?small_arg_with_dtor@@YAXUSmallWithDtor@@@Z"(i32 %{{.*}})
    135 // WIN64:   call void @"\01??1SmallWithDtor@@QEAA@XZ"
    136 // WIN64:   ret void
    137 
    138 // Test that references aren't destroyed in the callee.
    139 void ref_small_arg_with_dtor(const SmallWithDtor &s) { }
    140 // WIN32: define void @"\01?ref_small_arg_with_dtor@@YAXABUSmallWithDtor@@@Z"(%struct.SmallWithDtor* dereferenceable({{[0-9]+}}) %s) {{.*}} {
    141 // WIN32-NOT:   call x86_thiscallcc void @"\01??1SmallWithDtor@@QAE@XZ"
    142 // WIN32: }
    143 // WIN64-LABEL: define void @"\01?ref_small_arg_with_dtor@@YAXAEBUSmallWithDtor@@@Z"(%struct.SmallWithDtor* dereferenceable({{[0-9]+}}) %s)
    144 
    145 void big_arg_with_dtor(BigWithDtor s) {}
    146 // WIN64-LABEL: define void @"\01?big_arg_with_dtor@@YAXUBigWithDtor@@@Z"(%struct.BigWithDtor* %s)
    147 // WIN64:   call void @"\01??1BigWithDtor@@QEAA@XZ"
    148 // WIN64: }
    149 
    150 void call_big_arg_with_dtor() {
    151   big_arg_with_dtor(BigWithDtor());
    152 }
    153 // We can elide the copy of the temporary in the caller, because this object is
    154 // larger than 8 bytes and is passed indirectly.
    155 // WIN64-LABEL: define void @"\01?call_big_arg_with_dtor@@YAXXZ"()
    156 // WIN64:   call %struct.BigWithDtor* @"\01??0BigWithDtor@@QEAA@XZ"
    157 // WIN64:   call void @"\01?big_arg_with_dtor@@YAXUBigWithDtor@@@Z"(%struct.BigWithDtor* %{{.*}})
    158 // WIN64-NOT: call void @"\01??1BigWithDtor@@QEAA@XZ"
    159 // WIN64:   ret void
    160 
    161 // Test that temporaries passed by reference are destroyed in the caller.
    162 void temporary_ref_with_dtor() {
    163   ref_small_arg_with_dtor(SmallWithDtor());
    164 }
    165 // WIN32: define void @"\01?temporary_ref_with_dtor@@YAXXZ"() {{.*}} {
    166 // WIN32:   call x86_thiscallcc %struct.SmallWithDtor* @"\01??0SmallWithDtor@@QAE@XZ"
    167 // WIN32:   call void @"\01?ref_small_arg_with_dtor@@YAXABUSmallWithDtor@@@Z"
    168 // WIN32:   call x86_thiscallcc void @"\01??1SmallWithDtor@@QAE@XZ"
    169 // WIN32: }
    170 
    171 void takes_two_by_val_with_dtor(SmallWithDtor a, SmallWithDtor b);
    172 void eh_cleanup_arg_with_dtor() {
    173   takes_two_by_val_with_dtor(SmallWithDtor(), SmallWithDtor());
    174 }
    175 //   When exceptions are off, we don't have any cleanups.  See
    176 //   microsoft-abi-exceptions.cpp for these cleanups.
    177 // WIN32: define void @"\01?eh_cleanup_arg_with_dtor@@YAXXZ"() {{.*}} {
    178 // WIN32:   call x86_thiscallcc %struct.SmallWithDtor* @"\01??0SmallWithDtor@@QAE@XZ"
    179 // WIN32:   call x86_thiscallcc %struct.SmallWithDtor* @"\01??0SmallWithDtor@@QAE@XZ"
    180 // WIN32:   call void @"\01?takes_two_by_val_with_dtor@@YAXUSmallWithDtor@@0@Z"
    181 // WIN32-NOT: call x86_thiscallcc void @"\01??1SmallWithDtor@@QAE@XZ"
    182 // WIN32: }
    183 
    184 void small_arg_with_vftable(SmallWithVftable s) {}
    185 // LINUX-LABEL: define void @_Z22small_arg_with_vftable16SmallWithVftable(%struct.SmallWithVftable* %s)
    186 // WIN32: define void @"\01?small_arg_with_vftable@@YAXUSmallWithVftable@@@Z"(<{ %struct.SmallWithVftable }>* inalloca)
    187 // WIN64: define void @"\01?small_arg_with_vftable@@YAXUSmallWithVftable@@@Z"(%struct.SmallWithVftable* %s)
    188 
    189 void medium_arg_with_copy_ctor(MediumWithCopyCtor s) {}
    190 // LINUX-LABEL: define void @_Z25medium_arg_with_copy_ctor18MediumWithCopyCtor(%struct.MediumWithCopyCtor* %s)
    191 // WIN32: define void @"\01?medium_arg_with_copy_ctor@@YAXUMediumWithCopyCtor@@@Z"(<{ %struct.MediumWithCopyCtor }>* inalloca)
    192 // WIN64: define void @"\01?medium_arg_with_copy_ctor@@YAXUMediumWithCopyCtor@@@Z"(%struct.MediumWithCopyCtor* %s)
    193 
    194 void big_arg(Big s) {}
    195 // LINUX-LABEL: define void @_Z7big_arg3Big(%struct.Big* byval align 4 %s)
    196 // WIN32: define void @"\01?big_arg@@YAXUBig@@@Z"(%struct.Big* byval align 4 %s)
    197 // WIN64: define void @"\01?big_arg@@YAXUBig@@@Z"(%struct.Big* %s)
    198 
    199 class Class {
    200  public:
    201   Small thiscall_method_small() { return Small(); }
    202   // LINUX: define {{.*}} void @_ZN5Class21thiscall_method_smallEv(%struct.Small* noalias sret %agg.result, %class.Class* %this)
    203   // WIN32: define {{.*}} x86_thiscallcc void @"\01?thiscall_method_small@Class@@QAE?AUSmall@@XZ"(%class.Class* %this, %struct.Small* noalias sret %agg.result)
    204   // WIN64: define linkonce_odr void @"\01?thiscall_method_small@Class@@QEAA?AUSmall@@XZ"(%class.Class* %this, %struct.Small* noalias sret %agg.result)
    205 
    206   SmallWithCtor thiscall_method_small_with_ctor() { return SmallWithCtor(); }
    207   // LINUX: define {{.*}} void @_ZN5Class31thiscall_method_small_with_ctorEv(%struct.SmallWithCtor* noalias sret %agg.result, %class.Class* %this)
    208   // WIN32: define {{.*}} x86_thiscallcc void @"\01?thiscall_method_small_with_ctor@Class@@QAE?AUSmallWithCtor@@XZ"(%class.Class* %this, %struct.SmallWithCtor* noalias sret %agg.result)
    209   // WIN64: define linkonce_odr void @"\01?thiscall_method_small_with_ctor@Class@@QEAA?AUSmallWithCtor@@XZ"(%class.Class* %this, %struct.SmallWithCtor* noalias sret %agg.result)
    210 
    211   Small __cdecl cdecl_method_small() { return Small(); }
    212   // LINUX: define {{.*}} void @_ZN5Class18cdecl_method_smallEv(%struct.Small* noalias sret %agg.result, %class.Class* %this)
    213   // WIN32: define {{.*}} void @"\01?cdecl_method_small@Class@@QAA?AUSmall@@XZ"(%class.Class* %this, %struct.Small* noalias sret %agg.result)
    214   // WIN64: define linkonce_odr void @"\01?cdecl_method_small@Class@@QEAA?AUSmall@@XZ"(%class.Class* %this, %struct.Small* noalias sret %agg.result)
    215 
    216   Big __cdecl cdecl_method_big() { return Big(); }
    217   // LINUX: define {{.*}} void @_ZN5Class16cdecl_method_bigEv(%struct.Big* noalias sret %agg.result, %class.Class* %this)
    218   // WIN32: define {{.*}} void @"\01?cdecl_method_big@Class@@QAA?AUBig@@XZ"(%class.Class* %this, %struct.Big* noalias sret %agg.result)
    219   // WIN64: define linkonce_odr void @"\01?cdecl_method_big@Class@@QEAA?AUBig@@XZ"(%class.Class* %this, %struct.Big* noalias sret %agg.result)
    220 
    221   void thiscall_method_arg(Empty s) {}
    222   // LINUX: define {{.*}} void @_ZN5Class19thiscall_method_argE5Empty(%class.Class* %this)
    223   // WIN32: define {{.*}} void @"\01?thiscall_method_arg@Class@@QAEXUEmpty@@@Z"(%class.Class* %this, %struct.Empty* byval align 4 %s)
    224   // WIN64: define linkonce_odr void @"\01?thiscall_method_arg@Class@@QEAAXUEmpty@@@Z"(%class.Class* %this, i8 %s.coerce)
    225 
    226   void thiscall_method_arg(EmptyWithCtor s) {}
    227   // LINUX: define {{.*}} void @_ZN5Class19thiscall_method_argE13EmptyWithCtor(%class.Class* %this)
    228   // WIN32: define {{.*}} void @"\01?thiscall_method_arg@Class@@QAEXUEmptyWithCtor@@@Z"(%class.Class* %this, %struct.EmptyWithCtor* byval align 4 %s)
    229   // WIN64: define linkonce_odr void @"\01?thiscall_method_arg@Class@@QEAAXUEmptyWithCtor@@@Z"(%class.Class* %this, i8 %s.coerce)
    230 
    231   void thiscall_method_arg(Small s) {}
    232   // LINUX: define {{.*}} void @_ZN5Class19thiscall_method_argE5Small(%class.Class* %this, i32 %s.0)
    233   // WIN32: define {{.*}} void @"\01?thiscall_method_arg@Class@@QAEXUSmall@@@Z"(%class.Class* %this, %struct.Small* byval align 4 %s)
    234   // WIN64: define linkonce_odr void @"\01?thiscall_method_arg@Class@@QEAAXUSmall@@@Z"(%class.Class* %this, i32 %s.coerce)
    235 
    236   void thiscall_method_arg(SmallWithCtor s) {}
    237   // LINUX: define {{.*}} void @_ZN5Class19thiscall_method_argE13SmallWithCtor(%class.Class* %this, %struct.SmallWithCtor* byval align 4 %s)
    238   // WIN32: define {{.*}} void @"\01?thiscall_method_arg@Class@@QAEXUSmallWithCtor@@@Z"(%class.Class* %this, %struct.SmallWithCtor* byval align 4 %s)
    239   // WIN64: define linkonce_odr void @"\01?thiscall_method_arg@Class@@QEAAXUSmallWithCtor@@@Z"(%class.Class* %this, i32 %s.coerce)
    240 
    241   void thiscall_method_arg(Big s) {}
    242   // LINUX: define {{.*}} void @_ZN5Class19thiscall_method_argE3Big(%class.Class* %this, %struct.Big* byval align 4 %s)
    243   // WIN32: define {{.*}} void @"\01?thiscall_method_arg@Class@@QAEXUBig@@@Z"(%class.Class* %this, %struct.Big* byval align 4 %s)
    244   // WIN64: define linkonce_odr void @"\01?thiscall_method_arg@Class@@QEAAXUBig@@@Z"(%class.Class* %this, %struct.Big* %s)
    245 };
    246 
    247 void use_class() {
    248   Class c;
    249   c.thiscall_method_small();
    250   c.thiscall_method_small_with_ctor();
    251 
    252   c.cdecl_method_small();
    253   c.cdecl_method_big();
    254 
    255   c.thiscall_method_arg(Empty());
    256   c.thiscall_method_arg(EmptyWithCtor());
    257   c.thiscall_method_arg(Small());
    258   c.thiscall_method_arg(SmallWithCtor());
    259   c.thiscall_method_arg(Big());
    260 }
    261 
    262 struct X {
    263   X();
    264   ~X();
    265 };
    266 void g(X) {
    267 }
    268 // WIN32: define void @"\01?g@@YAXUX@@@Z"(<{ %struct.X, [3 x i8] }>* inalloca) {{.*}} {
    269 // WIN32:   call x86_thiscallcc void @"\01??1X@@QAE@XZ"(%struct.X* {{.*}})
    270 // WIN32: }
    271 void f() {
    272   g(X());
    273 }
    274 // WIN32: define void @"\01?f@@YAXXZ"() {{.*}} {
    275 // WIN32-NOT: call {{.*}} @"\01??1X@@QAE@XZ"
    276 // WIN32: }
    277 
    278 
    279 namespace test2 {
    280 // We used to crash on this due to the mixture of POD byval and non-trivial
    281 // byval.
    282 
    283 struct NonTrivial {
    284   NonTrivial();
    285   NonTrivial(const NonTrivial &o);
    286   ~NonTrivial();
    287   int a;
    288 };
    289 struct POD { int b; };
    290 
    291 int foo(NonTrivial a, POD b);
    292 void bar() {
    293   POD b;
    294   b.b = 13;
    295   int c = foo(NonTrivial(), b);
    296 }
    297 // WIN32-LABEL: define void @"\01?bar@test2@@YAXXZ"() {{.*}} {
    298 // WIN32:   %[[argmem:[^ ]*]] = alloca inalloca [[argmem_ty:<{ %"struct.test2::NonTrivial", %"struct.test2::POD" }>]]
    299 // WIN32:   getelementptr inbounds [[argmem_ty]], [[argmem_ty]]* %[[argmem]], i32 0, i32 1
    300 // WIN32:   call void @llvm.memcpy
    301 // WIN32:   getelementptr inbounds [[argmem_ty]], [[argmem_ty]]* %[[argmem]], i32 0, i32 0
    302 // WIN32:   call x86_thiscallcc %"struct.test2::NonTrivial"* @"\01??0NonTrivial@test2@@QAE@XZ"
    303 // WIN32:   call i32 @"\01?foo@test2@@YAHUNonTrivial@1@UPOD@1@@Z"([[argmem_ty]]* inalloca %argmem)
    304 // WIN32:   ret void
    305 // WIN32: }
    306 
    307 }
    308 
    309 namespace test3 {
    310 
    311 // Check that we padded the inalloca struct to a multiple of 4.
    312 struct NonTrivial {
    313   NonTrivial();
    314   NonTrivial(const NonTrivial &o);
    315   ~NonTrivial();
    316   int a;
    317 };
    318 void foo(NonTrivial a, bool b) { }
    319 // WIN32-LABEL: define void @"\01?foo@test3@@YAXUNonTrivial@1@_N@Z"(<{ %"struct.test3::NonTrivial", i8, [3 x i8] }>* inalloca)
    320 
    321 }
    322 
    323 // We would crash here because the later definition of ForwardDeclare1 results
    324 // in a different IR type for the value we want to store.  However, the alloca's
    325 // type will use the argument type selected by fn1.
    326 struct ForwardDeclare1;
    327 
    328 typedef void (*FnPtr1)(ForwardDeclare1);
    329 void fn1(FnPtr1 a, SmallWithDtor b) { }
    330 
    331 struct ForwardDeclare1 {};
    332 
    333 void fn2(FnPtr1 a, SmallWithDtor b) { fn1(a, b); };
    334 // WIN32-LABEL: define void @"\01?fn2@@YAXP6AXUForwardDeclare1@@@ZUSmallWithDtor@@@Z"
    335 // WIN32:   %[[a:[^ ]*]] = getelementptr inbounds [[argmem_ty:<{ {}\*, %struct.SmallWithDtor }>]], [[argmem_ty:<{ {}\*, %struct.SmallWithDtor }>]]* %{{.*}}, i32 0, i32 0
    336 // WIN32:   %[[a1:[^ ]*]] = bitcast {}** %[[a]] to void [[dst_ty:\(%struct.ForwardDeclare1\*\)\*]]*
    337 // WIN32:   %[[argmem:[^ ]*]] = alloca inalloca [[argmem_ty]]
    338 // WIN32:   %[[gep1:[^ ]*]] = getelementptr inbounds [[argmem_ty]], [[argmem_ty]]* %[[argmem]], i32 0, i32 1
    339 // WIN32:   %[[bc1:[^ ]*]] = bitcast %struct.SmallWithDtor* %[[gep1]] to i8*
    340 // WIN32:   call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[bc1]], i8* {{.*}}, i32 4, i32 4, i1 false)
    341 // WIN32:   %[[a2:[^ ]*]] = load void [[dst_ty]], void [[dst_ty]]* %[[a1]], align 4
    342 // WIN32:   %[[gep2:[^ ]*]] = getelementptr inbounds [[argmem_ty]], [[argmem_ty]]* %[[argmem]], i32 0, i32 0
    343 // WIN32:   %[[addr:[^ ]*]] = bitcast {}** %[[gep2]] to void [[dst_ty]]*
    344 // WIN32:   store void [[dst_ty]] %[[a2]], void [[dst_ty]]* %[[addr]], align 4
    345 // WIN32:   call void @"\01?fn1@@YAXP6AXUForwardDeclare1@@@ZUSmallWithDtor@@@Z"([[argmem_ty]]* inalloca %[[argmem]])
    346