On 12/6/15 6:01 PM, Andrew LaChance wrote:
On Saturday, 5 December 2015 at 23:27:31 UTC, Steven Schveighoffer wrote:
On 12/5/15 6:06 PM, Andrew LaChance wrote:
I was reading a blog post here: http://3d.benjamin-thaut.de/?p=20 which
mentions:
"Calls to the druntime invariant handler are emitted in release build
also and there is no way to turn them off. Even if the class does not
have any invariants the invariant handler will always be called, walk
the class hirarchy and generate multiple cache misses without actually
doing anything."
I was curious if this was still true today (the post was written 3 years
ago in Sept 2012).
Thanks!
I don't remember that the invariant was ever called in release mode.
But maybe I'm not understanding the statement.
I think what he was saying was that even in release mode, the druntime
would keep the invariant "subsystem," but just wouldn't call the
invariant handlers. So even in release mode, the code to get a list of
all handlers would happen, they just wouldn't be invoked. Rather than
completely ripping out the invariant system.
I don't think that's true. The invariant is called as part of function
execution.
Using obj2asm, the code emitted for an empty class function is vastly
larger without -release.
-Steve
