2012/3/8 Georg-Johann Lay <a...@gjlay.de>: > This patch adds a "w" alternative to *addhi3 and addhi3_clobber in order to > vote for class "w". This is similar to the orgiginal addhi3 insn up to version > 4.6. And there is no more explicit vote for "l" in addhi3_clobber, it's just > "r". > > Intention is to get a better usage of ADIW and SBIW instructions. > > Would it be good to split the alternatives even more and add "?" costs to > non-w > registers? > > Moreover, it might be advantageous to move addhi3_clobber up and before > *addhi3?
You can try and look at output. > > Passed without regressions. > > Ok for trunk? > > Johann > > * config/avr/avr.md (*addhi3, addhi3_clobber): Add "w" alternative > for constants in [-63,63]. Approved. Denis.
