<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Graphical glitches r600 in game this war of mine linux native" href="https://bugs.freedesktop.org/show_bug.cgi?id=103544#c6">Comment # 6</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Graphical glitches r600 in game this war of mine linux native" href="https://bugs.freedesktop.org/show_bug.cgi?id=103544">bug 103544</a> from <a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> Ilia Mirkin</a> <pre>(In reply to Roland Scheidegger from <a href="show_bug.cgi?id=103544#c5">comment #5</a>) > I've actually got that game myself here. > So I did the bisect and the winner is: > ce7a045feeef8cad155f1c9aa07f166e146e3d00 is the first bad commit > commit ce7a045feeef8cad155f1c9aa07f166e146e3d00 > Author: Ilia Mirkin <<a href="mailto:imirkin@alum.mit.edu">imirkin@alum.mit.edu</a>> > Date: Mon Jan 23 20:53:50 2017 -0500 > > r600g: use ieee variants of multiplication instructions > > This matches the behavior of most other drivers, including nouveau, > radeonsi, and i965. > > Signed-off-by: Ilia Mirkin <<a href="mailto:imirkin@alum.mit.edu">imirkin@alum.mit.edu</a>> > Reviewed-by: Nicolai Hähnle <<a href="mailto:nicolai.haehnle@amd.com">nicolai.haehnle@amd.com</a>> > > Looks like some numerical issue then, albeit I don't know if the game is at > fault here. Apologies for the trouble. The main difference between IEEE and non-IEEE is whether 0 * infinity = 0 or NaN. IEEE makes it mean NaN. DX9 behavior is 0. I added a flag to be used by st/nine to enable the DX9 behavior optionally, but leave the IEEE behavior for GLSL. (There was some additional desire to expose that in a GL ext for WINE to use, but it got shot down pretty quickly.) Perhaps there are other changes from using the IEEE instruction variants, e.g. denorms, which would be undesirable. I was never too familiar with the R600 ISA.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>