2012/2/16 Georg-Johann Lay <a...@gjlay.de>: > neghi2's "r,0" alternative reads > > com %B0 > neg %A0 > sbc %B0,__zero_reg__ > inc %B0 > > The INC commutates with the NEG+SBC and can be moved 2 instructions up: > > com %B0 > inc %B0 > neg %A0 > sbc %B0,__zero_reg__ > > COM+INC can be fused to NEG: > > neg %B0 > neg %A0 > sbc %B0,__zero_reg__ > > with the additional benefit that cc0 is always set_czn now. > > The *dec-and-branchhi!=-1 text peephole just coverd vanilla addhi3 without > clobber register. As addhi3 now has a clobber added in many cases, > that peephole don't match them any more. The patch adds peephole alternatives > for clobber variants of addhi3. > > Passed without regressions. > > Ok to apply? > > Johann > > * config/avr/avr.md (neghi2): Remove "!d,0" alternative. Tweak "r,0". > (*dec-and-branchhi!=-1.d.clobber): New text peephole. > (*dec-and-branchhi!=-1.l.clobber): New text peephole. >
Approved. Denis.
