On Mon, 2009-12-21 at 18:44 +0000, Paul Brook wrote: > > > > I am doing a port in GCC 4.4.0 for a 32 bit target. As a part of > > > > scheduling framework i have to write the move patterns with more > > > > clarity, so that i could control the scheduling with the help of > > > > attributes. Re-writting the pattern resulted in movsi pattern with 41 > > > > alternatives :( > > > > > > Use rtl expressions instead of alternatives. e.g. arm.md:arith_shiftsi > > > > Or use the more modern iterators approach. > > Aren't iterators for generating multiple insns (e.g. movsi and movdi) from > the > same pattern, whereas in this case we have a single insn that needs to > accept > many different operand combinartions?
Yes, but that is often better, I suspect, than having too fancy a pattern that breaks the optimization simplifications that genrecog does. Note that the attributes that were requested could be made part of the iterator as well, using a mode_attribute. R.
