notzed

catalyst 12.4, tahiti, floating point exception with small local work size

Discussion created by notzed on May 31, 2012
Latest reply on May 31, 2012 by kcarney

Strange bug, again with catalyst 12.4 and a HD 7970 and on a linux 64-bit machine.

 

If i run the attached programme with a local work size < 64, it throws a floating point exception.  See also the backtrace, as it is.  It works fine if i use the CPU device instead of the Tahiti device, or if the size >= 64.

 

It seems this is normally ignored in C, but in Java(JOCL) it causes an abort, for no apparently adequate reason.

 

I've been pulling my hair out for a couple of days with various bugs in my or others code exposed by the new driver/device, but I think this is one is at least not mine (the reason it's 42 is i was playing with a port of clsurf).

Attachments

Outcomes