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Mailing list archive
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Message #43456
Re: Internal units in the KiCAD source code
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To:
kicad-developers@xxxxxxxxxxxxxxxxxxx
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From:
Simon Richter <Simon.Richter@xxxxxxxxxx>
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Date:
Thu, 13 Feb 2020 22:10:28 +0100
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Autocrypt:
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In-reply-to:
<9f7bcd40-8418-46a3-c29a-0ae17f0e8c29@gmail.com>
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User-agent:
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.2
Hi Wayne,
On 13.02.20 20:47, Wayne Stambaugh wrote:
> One thing that can be said
> for sure about 64 bit internal units is that there will be a performance
> hit on 32 bit architectures. The questions are how much and do we care?
I'd expect that to be negligible compared to cache effects, where we
lose a bit because objects grow in size, and gain a bit because we get
rid of a few megabytes of almost-but-not-quite duplicated code.
If we were interested in micro-optimizing, unified internal units would
allow linking everything into a big application, dropping the
requirement for kifaces to be position-independent code, which would
give 32-bit x86 a 2-5% speedup.
The big gain of unified internal units would be on the developer side,
because we'd improve compilation speed, and we'd spend a lot less time
explaining to new developers why we're building position independent
static libraries, and why certain functions cannot be used from
functions inside common/.
Simon
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