> 31 bit constants are not useful for a GPU, where the most common use > would be masking or adding with a 32 bit RGBA value. Nor would it be > any use for doing crypto work where you want to do logic ops on all > 32 bits.
You probably missed the discussion on floating point constants last week. > I suggest sticking with 16 bit immediates which handles most loop > or pointer increments, most PC-relative jumps, most struct offsets, > etc. For 32 bit, load from memory. However, loading from memory is slow, and using 16 bits constants you need three instructions to load a 32 bit constant (load, shift and or), where with 31 bit constants you can load any constant in one or two instructions. Best Regards, Chris Matrakidis PS. I was wrong earlier: you can make 80000000h in two instructions with the current instruction set: load 40000000h and add it to itself or load 7fffffffh and invert it. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
