Hi! On Wed, Feb 09, 2022 at 10:43:17AM +0800, HAO CHEN GUI wrote: > This patch removes TImode from mode iterator BOOL_128. Thus, bool > operations (AND, IOR, XOR, NOT) > on TImode will be split to the relevant operations on word mode during expand > (in optabs.c).
But we also want to allow TImode in VSRs. This of course is a never- ending story, no choice works very well here. > Potential > optimizations can be implemented after the split. The former practice splits > it after the reload > pass which is too later for some optimizations. The new test case illustrates > it. All that are arguments for expanding to split form, not for removing TImode from the iterator. And you leave PTImode, which *always* is in GPRs! It may be that only leaving the "V" modes there works well; that needs testing though, more than just asaserting this. Just doing it and handling the ICEs later is fine, but in stage 1. (You'll also have to show it is *correct*, you need to prove (or show it really likely :-) ) that after this change there are no TImode things generated anywhere (anywhere!) that are no longer handled now). Segher
