[PATCH v2 1/4] Cygwin: console: Add workaround for broken IL/DL in xterm mode.

[Hans-Bernhard Bröker]

Am 01.03.2020 um 07:33 schrieb Takashi Yano:

> However, from the view point of performance, just inline
> static function is better. 

I don't see how that could be the case.  Inline methods of a static C++ 
object should not suffer any perfomance penalty compared to inline 
functions operating on static variables.

> Attached code measures the
> performance of access speed for wpbuf.
> I compiled it by g++ 7.4.0 with -O2 option.
> 
> The result is as follows.
> 
> Total1: 2.315627 second
> Total2: 1.588511 second
> Total3: 1.571572 second

Strange.  The result here (with GCC 9.2) is rather different:

$ g++ -O2 -o tt wpbuf-bench.cc && ./tt
Total1: 0.753815 second
Total2: 0.757444 second
Total3: 1.217352 second

And on inspection, all three bench*() functions do appear to have 
exactly the same machine code, too.  They may be inlined and mixed into 
main() somewhat differently, though.  That might explain the difference 
more readily than any actual difference in speed between the three 
implementations.