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Re: [ft-devel] different output from 32-bit and 64bit version of gray_re


From: Alexei Podtelezhnikov
Subject: Re: [ft-devel] different output from 32-bit and 64bit version of gray_render_scanline
Date: Thu, 6 Jun 2019 10:00:17 -0400

> > So, is this a surprise to anyone?  Should the two versions behave
> > identically in the absence of overflow or other extreme cases?
>
> The behaviour should be identical, yes.  Reason for two code paths is
> velocity.

Yes. The original version involves complex remainder accounting. I
strongly suspect that it breaks down a bit upon entering
gray_render_scanline. That function should be aware of the remainder
above, but it is not. You are welcome to track it down but it is a
tough code to grasp.



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