Hi, Richard.

>> Does IFN_COND_LEN make conceptual sense on RVV?  If so, would defining
>> it solve some of these problems?
Yes, IFN_COND_LEN make sense to RVV. We have vmerge instruction which depending on VL/AVL.

I must say my internal RVV GCC has IFN_LEN_VCOND_MASK which simplify

COND_LEN_ADD (mask, a, 0, b, len, bias) into LEN_VCOND_MASK (mask, a, b, len, bias)

I think upstream GCC could consider this approach.

Thanks.


juzhe.zhong@rivai.ai