[fpc-devel] Optimization theory
J. Gareth Moreton
gareth at moreton-family.com
Sun Jun 17 20:36:57 CEST 2018
Aah, I was in error. I used agner as my source, but even that says 5
cycles for a near call and 17-33 for a far call, so I'm not sure where I
got 50 from. My apologies. I have probably been avoiding function calls
more than necessary!
Gareth aka. Kit
On Sun 17/06/18 18:06 , David Pethes public at satd.sk sent:
On 17. 6. 2018 12:16, J. Gareth Moreton wrote:
> The issue with DivMod is that the saving isn't that great because of the
> penalty of calling a subroutine, which amounts to around 50 cycles on
> x86-64, about equal to DIV.
That number sounds awfully high, what's your source?
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