https://bugs.freedesktop.org/show_bug.cgi?id=86432

--- Comment #5 from Marek Olšák maraeo@gmail.com --- (In reply to Matt Arsenault from comment #4)

Created attachment 109693 [details] [review] Tentative fix

I think this is because I was assuming this would only ever see ordered comparisons. This tries disabling the combine for unordered compares

Your patch fixes this issue.