https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110751
--- Comment #4 from Kito Cheng <kito at gcc dot gnu.org> --- > OK, so TA is either merge or all-ones. Yes, your understand is correct, just few more detail is that can be mixing with either merge or all-ones. e.g. An 4 x i32 vector with mask 1 0 1 0 Op = | a | b | c | d | Mask = | 1 | 0 | 1 | 0 | the result could be: | a | b | c | d | | a | all-1 | c | d | | a | all-1 | c | all-1 | | a | all-1 | c | d | > Not sure how you can use MA at the moment since you specify an existing > operand in your target hook. As far as > I can see there's no value the target hook can provide that matches any of the implementation semantics? That's the key point - we don't know how to return an undefined value there, we have intrinsic can generate undefined value, but it seems impossible to generate that within the hook.
