search for: index_reg

...atus bits written. The result can also be %null meaning that the result is only written to the accumulator. Defining all the possible operand formats in separate instruction definitions would result in a huge number of instructions. The addressing modes are defined like this: offset[%base_reg, %index_reg] One, two or all three can be defined and the offset can be a relocatable symbol or a signed int. Memory operands need not be introduced until just before register allocation (maybe they couldn't be?). Any suggestions on how to attack this problem would be greatly appreciated. -Steve