Hi! On Mon, May 11, 2020 at 02:38:10PM +0100, Maxim Blinov via Gcc-help wrote: > So i was playing around with adding an intel-like cmov insn to a gcc > 7.5 based backend. syntax is > cmov %a,%b,%c,%d > > semantics is > a = (%b ? %c : %d) > > Now I am aware of two predefined rtl insns for this purpose (from optabs.def): > > mov$acc > cmov$a6 > > my question is, what are the differences, and in what context is one > selected over the other? cmov<mode>6 is never generated, but mov<mode>cc is. The former isn't documented either, but the latter is. It looks like cmov<nmode>6 is just historical? Or even was *never* used? Segher
