[Issue 14] ARM: runnable/testmath.d Arm not precise enough?

[gdc-bugzilla at gdcproject.org]

http://gdcproject.org/bugzilla/show_bug.cgi?id=14

--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject.org> 2012-09-25 16:53:49 UTC ---
An alternate option could be to rethink the codegen for floating comparisons in
GDC overall, as certain floating point comparisons fail in GDC x86/x86_64 too.


Problem:
Simply doing (A == B) is not correct.


Possible solution:
The comparison with an epsilon value is what most tends to be done in game
programming.

However the following:
(diff = A - B, (diff < EPSILON) && (-diff > EPSILON)))

Is a bit of wasted processing for something that should be fast, yet effective.


Here's an interesting read-up: http://realtimecollisiondetection.net/blog/?p=89


Regards
Iain

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