On Thursday 07 January 2010 09:11:11 michal wrote: > Zack, > > 1. Do I understand correctly that while > > D_ADD dst.xy, src1.xy, src2.zw > > will add one double, is the following code > > D_ADD dst, src1, src2.zwxy > > also valid, and results in two doubles being added together?
Good question. I guess that would be up to us to define. The DX/AMD CAL don't allow that because they define inputs as being in the xy component only so all the double instructions operate on exclusively one double. We could allow it but simply not use it right away from the state tracker side. > 2. Is the list of double-precision opcodes proposed by Igor roughly > enough for OpenCL implementation? Another good question. It will largely depend how our implementation of math functions for CL 1.1 will look like. CL 1.1 defines double support for such math functions as acos, acosh, acospi, cs, cosh, cospu (same with sin and tan), ceil, copysign, exp, exp2, exp10, fabs, fdim, floor, fmax, fmin, fmod, frack, frexp, hypot(x, y) [computes value of the square root of x^2+y^2], log, log2, log10, mad, mod, pow, pown, remainder, rint, round, rsqurt, sqrt, trunc (and various permutations of those and some that are obviously implementable with above), so it all boils down to how we'll implement those functions. I think that a minimal set that could be enough would be: dadd, ddiv, deq, dlt, dfrac, dfracexp, dldexp, dmax, dmin, dmov, dmul, dmuladd, drcp and dsqrt, plus conversion instructions that convert between float and double and back. (this is assuming table or some other fixed implementation of trigonometric functions and in general assumes that we trade performance for simplicity at least for the time being). z ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
