> Of course this matters only to >64bit (i.e. >registersize) values like > TImode, alias __int128. The problem here is that group-loading a > constant for a function return-value doesn't work; it's passed to > simplify_gen_subreg which horks on the VOIDmode constant. Thankfully, > the code below the context handles this case, twice the register-mode, > just fine, so let's just gate the simplify_gen_subreg call with a test > for a VOIDmode source.
IMO that's not as clear a cut as it seems. simplify_gen_subreg is supposed to work on VOIDmode constants, at least to be callable on them, because there is the simplify_gen_subreg -> simplify_subreg -> simplify_immed_subreg path. -- Eric Botcazou
