| Issue |
146303
|
| Summary |
missing tail call optimization on RVO
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
rockeet
|
```c++
struct Slice {
const char* data;
unsigned long size;
~Slice();
};
Slice get_s_impl();
Slice get_s() { return get_s_impl(); }
```
clang produces:
```asm
get_s():
push rbx
mov rbx, rdi
call get_s_impl()
mov rax, rbx
pop rbx
ret
```
icc recognized tail call and produces:
```asm
get_s():
..B1.1: # Preds ..B1.0
jmp get_s_impl() #7.24
```
g++ also missed such tail call optimization.
If delete `~Slice;`, g++ & clang recognize the tail call, but icc fails.
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