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llvm-project/clang/test/CodeGenCXX/microsoft-vector-deleting-dtors.cpp
Mariya Podchishchaeva d714a6c210
Reland [MS][clang] Add support for vector deleting destructors (#170337) 
This reverts commit
54a4da9df6.

MSVC supports an extension allowing to delete an array of objects via
pointer whose static type doesn't match its dynamic type. This is done
via generation of special destructors - vector deleting destructors.
MSVC's virtual tables always contain a pointer to the vector deleting
destructor for classes with virtual destructors, so not having this
extension implemented causes clang to generate code that is not
compatible with the code generated by MSVC, because clang always puts a
pointer to a scalar deleting destructor to the vtable. As a bonus the
deletion of an array of polymorphic object will work just like it does
with MSVC - no memory leaks and correct destructors are called.

This patch will cause clang to emit code that is compatible with code
produced by MSVC but not compatible with code produced with clang of
older versions, so the new behavior can be disabled via passing
-fclang-abi-compat=21 (or lower).

Fixes https://github.com/llvm/llvm-project/issues/19772
2025-12-12 09:54:32 +01:00

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// RUN: %clang_cc1 -emit-llvm -fms-extensions %s -triple=x86_64-pc-windows-msvc -o - | FileCheck --check-prefixes=X64,CHECK %s
// RUN: %clang_cc1 -emit-llvm -fms-extensions %s -triple=i386-pc-windows-msvc -o - | FileCheck --check-prefixes=X86,CHECK %s
// RUN: %clang_cc1 -emit-llvm -fms-extensions %s -triple=x86_64-pc-windows-msvc -fclang-abi-compat=21 -o - | FileCheck --check-prefixes=CLANG21 %s
struct Bird {
virtual ~Bird();
};
struct Parrot : public Bird {
// X64: @[[ParrotVtable:[0-9]+]] = private unnamed_addr constant { [2 x ptr] } { [2 x ptr] [ptr @"??_R4Parrot@@6B@", ptr @"??_EParrot@@UEAAPEAXI@Z"] }, comdat($"??_7Parrot@@6B@")
// X86: @[[ParrotVtable:[0-9]+]] = private unnamed_addr constant { [2 x ptr] } { [2 x ptr] [ptr @"??_R4Parrot@@6B@", ptr @"??_EParrot@@UAEPAXI@Z"] }, comdat($"??_7Parrot@@6B@")
// CLANG21: @[[ParrotVtable:[0-9]+]] = private unnamed_addr constant { [2 x ptr] } { [2 x ptr] [ptr @"??_R4Parrot@@6B@", ptr @"??_GParrot@@UEAAPEAXI@Z"] }, comdat($"??_7Parrot@@6B@")
// X64: @[[Bird:[0-9]+]] = private unnamed_addr constant { [2 x ptr] } { [2 x ptr] [ptr @"??_R4Bird@@6B@", ptr @"??_EBird@@UEAAPEAXI@Z"] }, comdat($"??_7Bird@@6B@")
// X86: @[[Bird:[0-9]+]] = private unnamed_addr constant { [2 x ptr] } { [2 x ptr] [ptr @"??_R4Bird@@6B@", ptr @"??_EBird@@UAEPAXI@Z"] }, comdat($"??_7Bird@@6B@")
// CLANG21: @[[Bird:[0-9]+]] = private unnamed_addr constant { [2 x ptr] } { [2 x ptr] [ptr @"??_R4Bird@@6B@", ptr @"??_GBird@@UEAAPEAXI@Z"] }, comdat($"??_7Bird@@6B@")
virtual ~Parrot() {}
};
Bird::~Bird() {}
// For the weird bird we first emit scalar deleting destructor, then find out
// that we need vector deleting destructor and remove the alias.
struct JustAWeirdBird {
virtual ~JustAWeirdBird() {}
bool doSmth(int n) {
JustAWeirdBird *c = new JustAWeirdBird[n];
delete[] c;
return true;
}
};
int i = 0;
struct HasOperatorDelete : public Bird{
~HasOperatorDelete() { }
void operator delete(void *p) { i-=2; }
void operator delete[](void *p) { i--; }
};
struct AllocatedAsArray : public Bird {
};
// Vector deleting dtor for Bird is an alias because no new Bird[] expressions
// in the TU.
// X64: @"??_EBird@@UEAAPEAXI@Z" = weak dso_local unnamed_addr alias ptr (ptr, i32), ptr @"??_GBird@@UEAAPEAXI@Z"
// X86: @"??_EBird@@UAEPAXI@Z" = weak dso_local unnamed_addr alias ptr (ptr, i32), ptr @"??_GBird@@UAEPAXI@Z"
// No scalar destructor for Parrot.
// CHECK-NOT: @"??_GParrot"
// No vector destructor definition for Bird.
// CHECK-NOT: define{{.*}}@"??_EBird"
// No scalar deleting dtor for JustAWeirdBird.
// CHECK-NOT: @"??_GJustAWeirdBird"
// CLANG21-NOT: @"??_E
void dealloc(Bird *p) {
delete[] p;
}
Bird* alloc() {
Parrot* P = new Parrot[38];
return P;
}
template<class C>
struct S {
void foo() { void *p = new C(); delete (C *)p; }
};
S<AllocatedAsArray[1][3]> sp;
void bar() {
dealloc(alloc());
JustAWeirdBird B;
B.doSmth(38);
Bird *p = new HasOperatorDelete[2];
dealloc(p);
sp.foo();
}
// CHECK-LABEL: define dso_local void @{{.*}}dealloc{{.*}}(
// CHECK-SAME: ptr noundef %[[PTR:.*]])
// CHECK: entry:
// CHECK-NEXT: %[[PTRADDR:.*]] = alloca ptr
// CHECK-NEXT: store ptr %[[PTR]], ptr %[[PTRADDR]]
// CHECK-NEXT: %[[LPTR:.*]] = load ptr, ptr %[[PTRADDR]]
// CHECK-NEXT: %[[ISNULL:.*]] = icmp eq ptr %[[LPTR]], null
// CHECK-NEXT: br i1 %[[ISNULL]], label %delete.end, label %delete.notnull
// CHECK: delete.notnull:
// X64-NEXT: %[[COOKIEGEP:.*]] = getelementptr inbounds i8, ptr %[[LPTR]], i64 -8
// X86-NEXT: %[[COOKIEGEP:.*]] = getelementptr inbounds i8, ptr %[[LPTR]], i32 -4
// X64-NEXT: %[[HOWMANY:.*]] = load i64, ptr %[[COOKIEGEP]]
// X86-NEXT: %[[HOWMANY:.*]] = load i32, ptr %[[COOKIEGEP]]
// X64-NEXT: %[[ISNOELEM:.*]] = icmp eq i64 %2, 0
// X86-NEXT: %[[ISNOELEM:.*]] = icmp eq i32 %2, 0
// CHECK-NEXT: br i1 %[[ISNOELEM]], label %vdtor.nocall, label %vdtor.call
// CHECK: vdtor.nocall:
// X64-NEXT: %[[HOWMANYBYTES:.*]] = mul i64 8, %[[HOWMANY]]
// X86-NEXT: %[[HOWMANYBYTES:.*]] = mul i32 4, %[[HOWMANY]]
// X64-NEXT: %[[ADDCOOKIESIZE:.*]] = add i64 %[[HOWMANYBYTES]], 8
// X86-NEXT: %[[ADDCOOKIESIZE:.*]] = add i32 %[[HOWMANYBYTES]], 4
// X64-NEXT: call void @"??_V@YAXPEAX_K@Z"(ptr noundef %[[COOKIEGEP]], i64 noundef %[[ADDCOOKIESIZE]])
// X86-NEXT: call void @"??_V@YAXPAXI@Z"(ptr noundef %[[COOKIEGEP]], i32 noundef %[[ADDCOOKIESIZE]])
// CHECK-NEXT: br label %delete.end
// CHECK: vdtor.call:
// CHECK-NEXT: %[[VTABLE:.*]] = load ptr, ptr %[[LPTR]]
// CHECK-NEXT: %[[FPGEP:.*]] = getelementptr inbounds ptr, ptr %[[VTABLE]], i64 0
// CHECK-NEXT: %[[FPLOAD:.*]] = load ptr, ptr %[[FPGEP]]
// X64-NEXT: %[[CALL:.*]] = call noundef ptr %[[FPLOAD]](ptr noundef nonnull align 8 dereferenceable(8) %[[LPTR]], i32 noundef 3)
// X86-NEXT: %[[CALL:.*]] = call x86_thiscallcc noundef ptr %[[FPLOAD]](ptr noundef nonnull align 4 dereferenceable(4) %[[LPTR]], i32 noundef 3)
// CHECK-NEXT: br label %delete.end
// CHECK: delete.end:
// CHECK-NEXT: ret void
// Normal loop over the array elements for clang21 ABI
// CLANG21-LABEL: define dso_local void @"?dealloc@@YAXPEAUBird@@@Z"
// CLANG21: %p.addr = alloca ptr
// CLANG21-NEXT: store ptr %p, ptr %p.addr
// CLANG21-NEXT: %0 = load ptr, ptr %p.addr
// CLANG21-NEXT: %isnull = icmp eq ptr %0, null
// CLANG21-NEXT: br i1 %isnull, label %delete.end2, label %delete.notnull
// CLANG21: delete.notnull:
// CLANG21-NEXT: %1 = getelementptr inbounds i8, ptr %0, i64 -8
// CLANG21-NEXT: %2 = load i64, ptr %1
// CLANG21-NEXT: %delete.end = getelementptr inbounds %struct.Bird, ptr %0, i64 %2
// CLANG21-NEXT: %arraydestroy.isempty = icmp eq ptr %0, %delete.end
// CLANG21-NEXT: br i1 %arraydestroy.isempty, label %arraydestroy.done1, label %arraydestroy.body
// CLANG21: arraydestroy.body:
// CLANG21-NEXT: %arraydestroy.elementPast = phi ptr [ %delete.end, %delete.notnull ], [ %arraydestroy.element, %arraydestroy.body ]
// CLANG21-NEXT: %arraydestroy.element = getelementptr inbounds %struct.Bird, ptr %arraydestroy.elementPast, i64 -1
// CLANG21-NEXT: call void @"??1Bird@@UEAA@XZ"(ptr noundef nonnull align 8 dereferenceable(8) %arraydestroy.element)
// CLANG21-NEXT: %arraydestroy.done = icmp eq ptr %arraydestroy.element, %0
// CLANG21-NEXT: br i1 %arraydestroy.done, label %arraydestroy.done1, label %arraydestroy.body
// CLANG21: arraydestroy.done1:
// CLANG21-NEXT: %3 = mul i64 8, %2
// CLANG21-NEXT: %4 = add i64 %3, 8
// CLANG21-NEXT: call void @"??_V@YAXPEAX_K@Z"(ptr noundef %1, i64 noundef %4)
// CLANG21-NEXT: br label %delete.end2
// Definition of S::foo, check that it has vector deleting destructor call
// X64-LABEL: define linkonce_odr dso_local void @"?foo@?$S@$$BY102UAllocatedAsArray@@@@QEAAXXZ"
// X86-LABEL: define linkonce_odr dso_local x86_thiscallcc void @"?foo@?$S@$$BY102UAllocatedAsArray@@@@QAEXXZ"
// X64: %[[NEWCALL:.*]] = call noalias noundef nonnull ptr @"??_U@YAPEAX_K@Z"(i64 noundef 32)
// X86: %[[NEWCALL:.*]] = call noalias noundef nonnull ptr @"??_U@YAPAXI@Z"(i32 noundef 16)
// X64: %[[ARR:.*]] = getelementptr inbounds i8, ptr %[[NEWCALL]], i64 8
// X86: %[[ARR:.*]] = getelementptr inbounds i8, ptr %[[NEWCALL]], i32 4
// CHECK: store ptr %[[ARR]], ptr %[[DP:.*]]
// CHECK: %[[DEL_PTR:.*]] = load ptr, ptr %[[DP:.*]]
// CHECK: delete.notnull:
// X64-NEXT: %[[COOKIEGEP:.*]] = getelementptr inbounds i8, ptr %[[DEL_PTR]], i64 -8
// X86-NEXT: %[[COOKIEGEP:.*]] = getelementptr inbounds i8, ptr %[[DEL_PTR]], i32 -4
// X64-NEXT: %[[HOWMANY:.*]] = load i64, ptr %[[COOKIEGEP]]
// X86-NEXT: %[[HOWMANY:.*]] = load i32, ptr %[[COOKIEGEP]]
// X64-NEXT: %[[ISNOELEM:.*]] = icmp eq i64 %[[HOWMANY]], 0
// X86-NEXT: %[[ISNOELEM:.*]] = icmp eq i32 %[[HOWMANY]], 0
// CHECK-NEXT: br i1 %[[ISNOELEM]], label %vdtor.nocall, label %vdtor.call
// CHECK: vdtor.nocall: ; preds = %delete.notnull
// X64-NEXT: %[[HOWMANYBYTES:.*]] = mul i64 8, %[[HOWMANY]]
// X86-NEXT: %[[HOWMANYBYTES:.*]] = mul i32 4, %[[HOWMANY]]
// X64-NEXT: %[[ADDCOOKIESIZE:.*]] = add i64 %[[HOWMANYBYTES]], 8
// X86-NEXT: %[[ADDCOOKIESIZE:.*]] = add i32 %[[HOWMANYBYTES]], 4
// X64-NEXT: call void @"??_V@YAXPEAX_K@Z"(ptr noundef %[[COOKIEGEP]], i64 noundef %[[ADDCOOKIESIZE]])
// X86-NEXT: call void @"??_V@YAXPAXI@Z"(ptr noundef %[[COOKIEGEP]], i32 noundef %[[ADDCOOKIESIZE]])
// CHECK-NEXT: br label %delete.end
// CHECK: vdtor.call: ; preds = %delete.notnull
// CHECK-NEXT: %[[VTABLE:.*]] = load ptr, ptr %[[DEL_PTR]]
// CHECK-NEXT: %[[FPGEP:.*]] = getelementptr inbounds ptr, ptr %[[VTABLE]], i64 0
// CHECK-NEXT: %[[FPLOAD:.*]] = load ptr, ptr %[[FPGEP]]
// X64-NEXT: %[[CALL:.*]] = call noundef ptr %[[FPLOAD]](ptr noundef nonnull align 8 dereferenceable(8) %[[DEL_PTR]], i32 noundef 3)
// X86-NEXT: %[[CALL:.*]] = call x86_thiscallcc noundef ptr %[[FPLOAD]](ptr noundef nonnull align 4 dereferenceable(4) %[[DEL_PTR]], i32 noundef 3)
// CHECK-NEXT: br label %delete.end
// CHECK: delete.end:
// CHECK-NEXT: ret void
// Vector dtor definition for Parrot.
// X64-LABEL: define weak dso_local noundef ptr @"??_EParrot@@UEAAPEAXI@Z"(
// X64-SAME: ptr {{.*}} %[[THIS:.*]], i32 {{.*}} %[[IMPLICIT_PARAM:.*]]) unnamed_addr
// X86-LABEL: define weak dso_local x86_thiscallcc noundef ptr @"??_EParrot@@UAEPAXI@Z"(
// X86-SAME: ptr noundef nonnull align 4 dereferenceable(4) %[[THIS:.*]], i32 noundef %[[IMPLICIT_PARAM:.*]]) unnamed_addr
// CHECK: entry:
// CHECK-NEXT: %[[RET:.*]] = alloca ptr
// CHECK-NEXT: %[[IPADDR:.*]] = alloca i32
// CHECK-NEXT: %[[THISADDR:.*]] = alloca ptr
// CHECK-NEXT: store i32 %[[IMPLICIT_PARAM]], ptr %[[IPADDR]]
// CHECK-NEXT: store ptr %[[THIS]], ptr %[[THISADDR]]
// CHECK-NEXT: %[[LTHIS:.*]] = load ptr, ptr %[[THISADDR]]
// CHECK-NEXT: store ptr %[[LTHIS]], ptr %[[RET]]
// CHECK-NEXT: %[[LIP:.*]] = load i32, ptr %[[IPADDR]]
// CHECK-NEXT: %[[SECONDBIT:.*]] = and i32 %[[LIP]], 2
// CHECK-NEXT: %[[ISSECONDBITZERO:.*]] = icmp eq i32 %[[SECONDBIT]], 0
// CHECK-NEXT: br i1 %[[ISSECONDBITZERO:.*]], label %dtor.scalar, label %dtor.vector
// CHECK: dtor.vector:
// X64-NEXT: %[[COOKIEGEP:.*]] = getelementptr inbounds i8, ptr %[[LTHIS]], i64 -8
// X86-NEXT: %[[COOKIEGEP:.*]] = getelementptr inbounds i8, ptr %[[LTHIS]], i32 -4
// X64-NEXT: %[[HOWMANY:.*]] = load i64, ptr %[[COOKIEGEP]]
// X86-NEXT: %[[HOWMANY:.*]] = load i32, ptr %[[COOKIEGEP]]
// X64-NEXT: %[[END:.*]] = getelementptr inbounds %struct.Parrot, ptr %[[LTHIS]], i64 %[[HOWMANY]]
// X86-NEXT: %[[END:.*]] = getelementptr inbounds %struct.Parrot, ptr %[[LTHIS]], i32 %[[HOWMANY]]
// CHECK-NEXT: br label %arraydestroy.body
// CHECK: arraydestroy.body:
// CHECK-NEXT: %[[PASTELEM:.*]] = phi ptr [ %delete.end, %dtor.vector ], [ %arraydestroy.element, %arraydestroy.body ]
// X64-NEXT: %[[CURELEM:.*]] = getelementptr inbounds %struct.Parrot, ptr %[[PASTELEM]], i64 -1
// X86-NEXT: %[[CURELEM:.*]] = getelementptr inbounds %struct.Parrot, ptr %[[PASTELEM]], i32 -1
// X64-NEXT: call void @"??1Parrot@@UEAA@XZ"(ptr noundef nonnull align 8 dereferenceable(8) %[[CURELEM]])
// X86-NEXT: call x86_thiscallcc void @"??1Parrot@@UAE@XZ"(ptr noundef nonnull align 4 dereferenceable(4) %[[CURELEM]])
// CHECK-NEXT: %[[DONE:.*]] = icmp eq ptr %[[CURELEM]], %[[LTHIS]]
// CHECK-NEXT: br i1 %[[DONE]], label %arraydestroy.done3, label %arraydestroy.body
// CHECK: arraydestroy.done3:
// CHECK-NEXT: br label %dtor.vector.cont
// CHECK: dtor.vector.cont:
// CHECK-NEXT: %[[FIRSTBIT:.*]] = and i32 %[[LIP]], 1
// CHECK-NEXT: %[[ISFIRSTBITZERO:.*]] = icmp eq i32 %[[FIRSTBIT]], 0
// CHECK-NEXT: br i1 %[[ISFIRSTBITZERO]], label %dtor.continue, label %dtor.call_delete_after_array_destroy
// CHECK: dtor.call_delete_after_array_destroy:
// X64-NEXT: call void @"??_V@YAXPEAX_K@Z"(ptr noundef %[[COOKIEGEP]], i64 noundef 8)
// X86-NEXT: call void @"??_V@YAXPAXI@Z"(ptr noundef %[[COOKIEGEP]], i32 noundef 4)
// CHECK-NEXT: br label %dtor.continue
// CHECK: dtor.scalar:
// X64-NEXT: call void @"??1Parrot@@UEAA@XZ"(ptr noundef nonnull align 8 dereferenceable(8) %[[LTHIS]])
// X86-NEXT: call x86_thiscallcc void @"??1Parrot@@UAE@XZ"(ptr noundef nonnull align 4 dereferenceable(4) %[[LTHIS]])
// CHECK-NEXT: %[[FIRSTBIT:.*]] = and i32 %[[LIP]], 1
// CHECK-NEXT: %[[ISFIRSTBITZERO:.*]] = icmp eq i32 %[[FIRSTBIT]], 0
// CHECK-NEXT: br i1 %[[ISFIRSTBITZERO]], label %dtor.continue, label %dtor.call_delete
// CHECK: dtor.call_delete:
// X64-NEXT: call void @"??3@YAXPEAX_K@Z"(ptr noundef %[[LTHIS]], i64 noundef 8)
// X86-NEXT: call void @"??3@YAXPAXI@Z"(ptr noundef %[[LTHIS]], i32 noundef 4)
// CHECK-NEXT: br label %dtor.continue
// CHECK: dtor.continue:
// CHECK-NEXT: %[[LOADRET:.*]] = load ptr, ptr %[[RET]]
// CHECK-NEXT: ret ptr %[[LOADRET]]
// X64: define weak dso_local noundef ptr @"??_EJustAWeirdBird@@UEAAPEAXI@Z"(
// X64-SAME: ptr noundef nonnull align 8 dereferenceable(8) %this, i32 noundef %should_call_delete)
// CLANG21: define linkonce_odr dso_local noundef ptr @"??_GJustAWeirdBird@@UEAAPEAXI@Z"(
// X86: define weak dso_local x86_thiscallcc noundef ptr @"??_EJustAWeirdBird@@UAEPAXI@Z"(
// X86-SAME: ptr noundef nonnull align 4 dereferenceable(4) %this, i32 noundef %should_call_delete) unnamed_addr
// X64-LABEL: define weak dso_local noundef ptr @"??_EHasOperatorDelete@@UEAAPEAXI@Z"
// X86-LABEL: define weak dso_local x86_thiscallcc noundef ptr @"??_EHasOperatorDelete@@UAEPAXI@Z"
// CLANG21: define linkonce_odr dso_local noundef ptr @"??_GHasOperatorDelete@@UEAAPEAXI@Z"
// CHECK: dtor.call_delete_after_array_destroy:
// CHECK-NEXT: %[[SHOULD_CALL_GLOB_DELETE:.*]] = and i32 %should_call_delete2, 4
// CHECK-NEXT: %[[CHK:.*]] = icmp eq i32 %[[SHOULD_CALL_GLOB_DELETE]], 0
// CHECK-NEXT: br i1 %[[CHK]], label %dtor.call_class_delete_after_array_destroy, label %dtor.call_glob_delete_after_array_destroy
// CHECK: dtor.call_class_delete_after_array_destroy:
// X64-NEXT: call void @"??_VHasOperatorDelete@@SAXPEAX@Z"(ptr noundef %2)
// X86-NEXT: call void @"??_VHasOperatorDelete@@SAXPAX@Z"
// CHECK-NEXT: br label %dtor.continue
// CHECK: dtor.call_glob_delete_after_array_destroy:
// X64-NEXT: call void @"??_V@YAXPEAX_K@Z"(ptr noundef %2, i64 noundef 8)
// X86-NEXT: call void @"??_V@YAXPAXI@Z"(ptr noundef %2, i32 noundef 4)
// CHECK-NEXT: br label %dtor.continue
struct BaseDelete1 {
void operator delete[](void *);
};
struct BaseDelete2 {
void operator delete[](void *);
};
struct BaseDestructor {
BaseDestructor() {}
virtual ~BaseDestructor() = default;
};
struct Derived : BaseDelete1, BaseDelete2, BaseDestructor {
Derived() {}
};
void foobartest() {
Derived *a = new Derived[10]();
::delete[] a;
}
// X64-LABEL: define weak dso_local noundef ptr @"??_EDerived@@UEAAPEAXI@Z"(ptr {{.*}} %this, i32 noundef %should_call_delete)
// X86-LABEL: define weak dso_local x86_thiscallcc noundef ptr @"??_EDerived@@UAEPAXI@Z"(ptr {{.*}} %this, i32 noundef %should_call_delete)
// CHECK: %retval = alloca ptr
// CHECK-NEXT: %should_call_delete.addr = alloca i32, align 4
// CHECK-NEXT: %this.addr = alloca ptr
// CHECK-NEXT: store i32 %should_call_delete, ptr %should_call_delete.addr, align 4
// CHECK-NEXT: store ptr %this, ptr %this.addr
// CHECK-NEXT: %this1 = load ptr, ptr %this.addr
// CHECK-NEXT: store ptr %this1, ptr %retval
// CHECK-NEXT: %should_call_delete2 = load i32, ptr %should_call_delete.addr, align 4
// CHECK-NEXT: %0 = and i32 %should_call_delete2, 2
// CHECK-NEXT: %1 = icmp eq i32 %0, 0
// CHECK-NEXT: br i1 %1, label %dtor.scalar, label %dtor.vector
// CHECK: dtor.vector:
// X64-NEXT: %2 = getelementptr inbounds i8, ptr %this1, i64 -8
// X86-NEXT: %2 = getelementptr inbounds i8, ptr %this1, i32 -4
// X64-NEXT: %3 = load i64, ptr %2
// X86-NEXT: %3 = load i32, ptr %2
// X64-NEXT: %delete.end = getelementptr inbounds %struct.Derived, ptr %this1, i64 %3
// X86-NEXT: %delete.end = getelementptr inbounds %struct.Derived, ptr %this1, i32 %3
// CHECK-NEXT: br label %arraydestroy.body
// CHECK: arraydestroy.body:
// CHECK-NEXT: %arraydestroy.elementPast = phi ptr [ %delete.end, %dtor.vector ], [ %arraydestroy.element, %arraydestroy.body ]
// X64-NEXT: %arraydestroy.element = getelementptr inbounds %struct.Derived, ptr %arraydestroy.elementPast, i64 -1
// X86-NEXT: %arraydestroy.element = getelementptr inbounds %struct.Derived, ptr %arraydestroy.elementPast, i32 -1
// X64-NEXT: call void @"??1Derived@@UEAA@XZ"(ptr noundef nonnull align 8 dereferenceable(16) %arraydestroy.element)
// X86-NEXT: call x86_thiscallcc void @"??1Derived@@UAE@XZ"(ptr noundef nonnull align 4 dereferenceable(8) %arraydestroy.element)
// CHECK-NEXT: %arraydestroy.done = icmp eq ptr %arraydestroy.element, %this1
// CHECK-NEXT: br i1 %arraydestroy.done, label %arraydestroy.done3, label %arraydestroy.body
// CHECK: arraydestroy.done3:
// CHECK-NEXT: br label %dtor.vector.cont
// CHECK: dtor.vector.cont:
// CHECK-NEXT: %4 = and i32 %should_call_delete2, 1
// CHECK-NEXT: %5 = icmp eq i32 %4, 0
// CHECK-NEXT: br i1 %5, label %dtor.continue, label %dtor.call_delete_after_array_destroy
// CHECK: dtor.call_delete_after_array_destroy:
// X64-NEXT: call void @"??_V@YAXPEAX_K@Z"(ptr noundef %2, i64 noundef 16)
// X86-NEXT: call void @"??_V@YAXPAXI@Z"(ptr noundef %2, i32 noundef 8)
// CHECK-NEXT: br label %dtor.continue
// CHECK: dtor.scalar:
// X64-NEXT: call void @"??1Derived@@UEAA@XZ"(ptr noundef nonnull align 8 dereferenceable(16) %this1)
// X86-NEXT: call x86_thiscallcc void @"??1Derived@@UAE@XZ"(ptr noundef nonnull align 4 dereferenceable(8) %this1)
// CHECK-NEXT: %6 = and i32 %should_call_delete2, 1
// CHECK-NEXT: %7 = icmp eq i32 %6, 0
// CHECK-NEXT: br i1 %7, label %dtor.continue, label %dtor.call_delete
// CHECK: dtor.call_delete:
// X64-NEXT: call void @"??3@YAXPEAX_K@Z"(ptr noundef %this1, i64 noundef 16)
// X86-NEXT: call void @"??3@YAXPAXI@Z"(ptr noundef %this1, i32 noundef 8)
// CHECK-NEXT: br label %dtor.continue
// CHECK: dtor.continue:
// CHECK-NEXT: %8 = load ptr, ptr %retval
// CHECK-NEXT: ret ptr %8
// X64: define weak dso_local noundef ptr @"??_EAllocatedAsArray@@UEAAPEAXI@Z"
// X86: define weak dso_local x86_thiscallcc noundef ptr @"??_EAllocatedAsArray@@UAEPAXI@Z"
// CLANG21: define linkonce_odr dso_local noundef ptr @"??_GAllocatedAsArray@@UEAAPEAXI@Z"
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