rt
-mev4 | -mev45 | -mev5 | -mev56 | -mpca56 | -mev6 | -mev67 | -mev68 | -mall
			specify variant of Alpha architecture
-m21064 | -m21066 | -m21164 | -m21164a | -m21164pc | -m21264 | -m21264a | -m21264b
			these variants include PALcode opcodes