[Bug 105670] [regression][hang] Trine1EE hangs GPU after loading screen on Mesa3D-17.3 and later

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Mar 25 09:43:22 UTC 2018


--- Comment #12 from iive at yahoo.com ---
(In reply to Gert Wollny from comment #11)
> The if statement can be be true because  
> which means at this point R3.w can be zero.

But that's the point in my initial question.
When R3.w=0.0, will "if(+0.0 != -0.0)" be true of false, because float points
do have 2 different zeroes - positive and negative one, and both zero floats do
have different binary representation aka +0.0 = 0x00000000; -0.0 = 0x80000000.

My question is more of the lines: are shader float point operations always IEEE
complaint, and is it guaranteed that (+0.0 == -0.0) is true for all their
(For example, SSE float operations sometimes deviate from IEEE for speed

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