On Fri, Apr 25, 2014 at 12:52 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: > And then you have a peephole pass that looks for this and converts it > into a single instruction. Additionally this has the advantage of > working on code where people manually implemented uaddCarry (although > there are other ways to implement it, and this would only detect one > of them).
CMP on i965 returns 0 or 0xFFFFFFFF rather than 0 or 1. It also unconditionally writes the flag register, which won't be used, and will only cause scheduling conflicts. I think I'd prefer you do a carry -> SLT lowering pass until I have a peephole pass in place. But I'm also not really concerned about performance from this at the moment either... _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
