| // RUN: %clang_cc1 -emit-llvm -o - %s | FileCheck %s |
| |
| // Test code generation for the named return value optimization. |
| class X { |
| public: |
| X(); |
| X(const X&); |
| ~X(); |
| }; |
| |
| // CHECK: define void @_Z5test0v |
| X test0() { |
| X x; |
| // CHECK-NOT: call void @_ZN1XD1Ev |
| // CHECK: ret void |
| return x; |
| } |
| |
| // CHECK: define void @_Z5test1b( |
| X test1(bool B) { |
| // CHECK: call void @_ZN1XC1Ev |
| X x; |
| // CHECK-NOT: call void @_ZN1XD1Ev |
| // CHECK: ret void |
| if (B) |
| return (x); |
| return x; |
| } |
| |
| // CHECK: define void @_Z5test2b |
| X test2(bool B) { |
| // No NRVO |
| // CHECK: call void @_ZN1XC1Ev |
| X x; |
| // CHECK: call void @_ZN1XC1Ev |
| X y; |
| // CHECK: call void @_ZN1XC1ERKS_ |
| if (B) |
| return y; |
| // CHECK: call void @_ZN1XC1ERKS_ |
| return x; |
| // CHECK: call void @_ZN1XD1Ev |
| // CHECK: call void @_ZN1XD1Ev |
| // CHECK: ret void |
| } |
| |
| X test3(bool B) { |
| // FIXME: We don't manage to apply NRVO here, although we could. |
| { |
| X y; |
| return y; |
| } |
| X x; |
| return x; |
| } |