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Generate code for the move assignment operator using memcpy, the same as we do

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for the copy assignment operator.

llvm-svn: 190385
This commit is contained in:
Nick Lewycky 2013-09-10 05:14:39 +00:00
parent e2622c2acc
commit b39be1f38e
2 changed files with 28 additions and 1 deletions
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3
clang/lib/CodeGen/CodeGenFunction.cpp
View File

@ -702,7 +702,8 @@ void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn,
// clones the body of the function call operator (but is actually static).
EmitLambdaStaticInvokeFunction(cast<CXXMethodDecl>(FD));
} else if (FD->isDefaulted() && isa<CXXMethodDecl>(FD) &&
cast<CXXMethodDecl>(FD)->isCopyAssignmentOperator()) {
(cast<CXXMethodDecl>(FD)->isCopyAssignmentOperator() ||
cast<CXXMethodDecl>(FD)->isMoveAssignmentOperator())) {
// Implicit copy-assignment gets the same special treatment as implicit
// copy-constructors.
emitImplicitAssignmentOperatorBody(Args);

26
clang/test/CodeGenCXX/move-assignment.cpp Normal file
View File

@ -0,0 +1,26 @@
// RUN: %clang_cc1 -emit-llvm -std=c++11 -o - %s -triple x86_64-pc-linux-gnu | FileCheck %s
struct A {
A &operator=(A&&);
};
struct B {
A a;
int i;
bool b;
char c;
long l;
float f;
};
void test1() {
B b1, b2;
b1 = static_cast<B&&>(b2);
}
// CHECK-LABEL: define {{.*}} @_ZN1BaSEOS_
// CHECK: call {{.*}} @_ZN1AaSEOS_
// CHECK-NOT: store
// CHECK: call {{.*}}memcpy{{.*}}, i64 24
// CHECK-NOT: store
// CHECK: ret