turkeyman at gmail.com
Sat Feb 4 11:57:30 PST 2012
So I've been trying to collate a sensible framework for a standard
cross-platform simd module since Walter added the SIMD stuff.
I'm sure everyone will have a million opinions on this, so I've drawn my
approach up to a point where it properly conveys the intent, and I've
proven the code gen works, and is good. Now I figure I should get everyone
to shoot it down before I commit to the tedious work filling in all the
(Note: I've only written code against GDC as yet, since DMD's SSE only
supports x64, and x64 is not supported in Windows)
The code might surprise a lot of people... so I'll give a few words about
The key goal here is to provide the lowest level USEFUL set of functions,
all the basic functions that people actually use in their algorithms,
without requiring them to understand the quirks of various platforms vector
Different SIMD hardware tends to have very different shuffling, load/store,
component addressing, support for more/less of the primitive maths
This library, which is the lowest level library I expect programmers would
ever want to use in their apps, should provide that API at the lowest
First criticism I expect is for many to insist on a class-style vector
library, which I personally think has no place as a low level, portable API.
Everyone has a different idea of what the perfect vector lib should look
like, and it tends to change significantly with respect to its application.
I feel this flat API is easier to implement, maintain, and understand, and
I expect the most common use of this lib will be in the back end of peoples
own vector/matrix/linear algebra libs that suit their apps.
My key concern is with my function names... should I be worried about name
collisions in such a low level lib? I already shadow a lot of standard
I prefer them abbreviated in this (fairly standard) way, keeps lines of
code short and compact. It should be particularly familiar to anyone who
has written shaders and such.
Opinions? Shall I continue as planned?
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