mac3n@babbage.acc.virginia.edu (Alex Colvin) (02/29/88)
> Prefix instructions in the GE RPM-40 >The HP Precision Architecture provides for these kinds of operations by its >Shift and Add instructions. There is a pre-shifter before one of the >inputs to the CPU. It allows for one of the operands to be pre-shifted by >upto 3 bits before an addition happens. aren't these pretty much the same? in the former case a PREFIX is folowed by an ordinary LOAD register (or PUSH). in the latter case an ordinary LOAD register is followed by a SHAD. it seems that the SHAD avoids the need for a special context after PREFIX. maybe it should be called SUFFIX. it also has other uses.