> While working on overlap for widening instructions, I realize that we set > vwadd.wx/vfwadd.wf as earlyclobber which is incorrect. > > Since according to RVV ISA: > "The destination EEW equals the source EEW." > > For both vwadd.wx/vfwadd.wf source vector and dest vector operand are same > EEW. > So, they should be able to overlap registers.
A bit more verbose: vwadd.vx widens the first source operand (i.e. 2 * source EEW = dest EEW) while vwadd.wx only widens the second/scalar source operand. Therefore overlap is legal for wx but not for vx. OK from my side as it's a fix. Regards Robin
