On 23/11/2016 10:35, Eric Botcazou wrote: > I now wonder > whether this also matters for !WORD_REGISTER_OPERATIONS targets, e.g. x86: > > (set (reg1:DI) ... > ... > (set (reg1:QI) (expression:QI)) > ... > (set (reg2:DI) (any_extend:DI (reg1:QI))) > ... > (use (reg1:DI)) > > where the use reads well-defined upper bits from the very first set.
Does it really do that with a (set (reg1:QI)), as opposed to a (set (strict_low_part (subreg:QI (reg1:DI)))? Paolo
