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Add test for disabling Dead Virtual Function Elimination 

Differential Revision: https://reviews.llvm.org/D88349
This commit is contained in:
Dominic Chen 2020-09-25 21:46:49 -04:00
parent 4d5b1de40e
commit c102488293
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GPG Key ID: 7661C15B1B8EC438
1 changed files with 22 additions and 1 deletions
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23
clang/test/CodeGenCXX/virtual-function-elimination.cpp
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@ -1,5 +1,5 @@
// RUN: %clang_cc1 -triple x86_64-unknown-linux -flto -flto-unit -fvirtual-function-elimination -fwhole-program-vtables -emit-llvm -o - %s | FileCheck %s
// RUN: %clang -target x86_64-unknown-linux -flto -fvirtual-function-elimination -fno-virtual-function-elimination -fwhole-program-vtables -S -emit-llvm -o - %s | FileCheck %s -check-prefix=NOVFE
struct __attribute__((visibility("default"))) A {
virtual void foo();
@ -8,9 +8,13 @@ struct __attribute__((visibility("default"))) A {
void test_1(A *p) {
// A has default visibility, so no need for type.checked.load.
// CHECK-LABEL: define void @_Z6test_1P1A
// NOVFE-LABEL: define dso_local void @_Z6test_1P1A
// CHECK: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds void (%struct.A*)*, void (%struct.A*)** {{%.+}}, i64 0
// NOVFE: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds void (%struct.A*)*, void (%struct.A*)** {{%.+}}, i64 0
// CHECK: [[FN_PTR:%.+]] = load void (%struct.A*)*, void (%struct.A*)** [[FN_PTR_ADDR]]
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.A*)*, void (%struct.A*)** [[FN_PTR_ADDR]]
// CHECK: call void [[FN_PTR]](
// NOVFE: call void [[FN_PTR]](
p->foo();
}
@ -22,9 +26,13 @@ struct __attribute__((visibility("hidden"))) [[clang::lto_visibility_public]] B
void test_2(B *p) {
// B has public LTO visibility, so no need for type.checked.load.
// CHECK-LABEL: define void @_Z6test_2P1B
// NOVFE-LABEL: define dso_local void @_Z6test_2P1B
// CHECK: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds void (%struct.B*)*, void (%struct.B*)** {{%.+}}, i64 0
// NOVFE: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds void (%struct.B*)*, void (%struct.B*)** {{%.+}}, i64 0
// CHECK: [[FN_PTR:%.+]] = load void (%struct.B*)*, void (%struct.B*)** [[FN_PTR_ADDR]]
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.B*)*, void (%struct.B*)** [[FN_PTR_ADDR]]
// CHECK: call void [[FN_PTR]](
// NOVFE: call void [[FN_PTR]](
p->foo();
}
@ -37,10 +45,14 @@ struct __attribute__((visibility("hidden"))) C {
void test_3(C *p) {
// C has hidden visibility, so we generate type.checked.load to allow VFE.
// CHECK-LABEL: define void @_Z6test_3P1C
// NOVFE-LABEL: define dso_local void @_Z6test_3P1C
// CHECK: [[LOAD:%.+]] = call { i8*, i1 } @llvm.type.checked.load(i8* {{%.+}}, i32 0, metadata !"_ZTS1C")
// NOVFE: call i1 @llvm.type.test(i8* {{%.+}}, metadata !"_ZTS1C")
// CHECK: [[FN_PTR_I8:%.+]] = extractvalue { i8*, i1 } [[LOAD]], 0
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.C*)*, void (%struct.C*)** {{%.+}}, align 8
// CHECK: [[FN_PTR:%.+]] = bitcast i8* [[FN_PTR_I8]] to void (%struct.C*)*
// CHECK: call void [[FN_PTR]](
// NOVFE: call void [[FN_PTR]](
p->foo();
}
@ -48,10 +60,14 @@ void test_4(C *p) {
// When using type.checked.load, we pass the vtable offset to the intrinsic,
// rather than adding it to the pointer with a GEP.
// CHECK-LABEL: define void @_Z6test_4P1C
// NOVFE-LABEL: define dso_local void @_Z6test_4P1C
// CHECK: [[LOAD:%.+]] = call { i8*, i1 } @llvm.type.checked.load(i8* {{%.+}}, i32 8, metadata !"_ZTS1C")
// NOVFE: call i1 @llvm.type.test(i8* {{%.+}}, metadata !"_ZTS1C")
// CHECK: [[FN_PTR_I8:%.+]] = extractvalue { i8*, i1 } [[LOAD]], 0
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.C*)*, void (%struct.C*)** {{%.+}}, align 8
// CHECK: [[FN_PTR:%.+]] = bitcast i8* [[FN_PTR_I8]] to void (%struct.C*)*
// CHECK: call void [[FN_PTR]](
// NOVFE: call void [[FN_PTR]](
p->bar();
}
@ -64,12 +80,17 @@ void test_5(C *p, void (C::*q)(void)) {
// function pointer to the intrinsic, this information would be lost. No
// codegen changes on the non-virtual side.
// CHECK-LABEL: define void @_Z6test_5P1CMS_FvvE(
// NOVFE-LABEL: define dso_local void @_Z6test_5P1CMS_FvvE(
// CHECK: [[FN_PTR_ADDR:%.+]] = getelementptr i8, i8* %vtable, i64 {{%.+}}
// CHECK: [[LOAD:%.+]] = call { i8*, i1 } @llvm.type.checked.load(i8* [[FN_PTR_ADDR]], i32 0, metadata !"_ZTSM1CFvvE.virtual")
// NOVFE-NOT: call { i8*, i1 } @llvm.type.checked.load(i8* {{%.+}}, i32 0, metadata !"_ZTSM1CFvvE.virtual")
// CHECK: [[FN_PTR_I8:%.+]] = extractvalue { i8*, i1 } [[LOAD]], 0
// CHECK: [[FN_PTR:%.+]] = bitcast i8* [[FN_PTR_I8]] to void (%struct.C*)*
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.C*)*, void (%struct.C*)** {{%.+}}, align 8
// CHECK: [[PHI:%.+]] = phi void (%struct.C*)* {{.*}}[ [[FN_PTR]], {{.*}} ]
// NOVFE: [[PHI:%.+]] = phi void (%struct.C*)* {{.*}}[ [[FN_PTR]], {{.*}} ]
// CHECK: call void [[PHI]](
// NOVFE: call void [[PHI]](
(p->*q)();
}