Raymond Chen's take on so-called zero cost exceptions

[deadalnix]

On Monday, 28 February 2022 at 21:39:03 UTC, H. S. Teoh wrote:
> How is this any worse than explicitly checking for error codes? 
> Isn't the optimization situation of:
>
> 	MyObj obj;
> 	mayThrow();
> 	...
> 	// obj.dtor called
>
> different from:
>
> 	MyObj obj;
> 	if (mayError() == ERROR)
> 		goto END;
> 	...
> 	END:
> 	// obj.dtor called
>
> ?
>
>
> T

obj can be kept in a register in the goto case, it cannot in the 
exception case. So you'll have a couple extra load/store vs extra 
branches.