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Subject: Re: [boost] Reforming Boost.System and <system_error> round 2
From: Peter Dimov (lists_at_[hidden])
Date: 2018-01-16 13:54:26

Andrey Semashev wrote:

> In the generated code I noticed that the compiler generated a check of
> whether the virtual function `failure` is actually
`experimental::error_category::failure`. If it is, the code uses an inlined
version of this function (otherwise, the actual indirect call is performed).
So if you comment `code_category_impl::failure` the test succeeds and the
indirect call is avoided. Here are the results for this case:
> Experimental test: 71711 usec, 1394486201.559036 tests per second
> std test: 48177 usec, 2075679266.039812 tests per second
> This is still a 1.5x difference.

That's pretty good. In practice, if the function does something nontrivial,
this amount of overhead will be entirely lost in the noise.

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