why vslideup intrinsics have dest parameter

[datao2001]

Hi, I am confused that vslideup intrinsics have dest parameter and vslidedown intrinsics don't have. Is dest parameter redundant?

[topperc]

The dest parameter is there to support the "unchanged" part of this from the vector spec.

vslideup behavior for destination elements
 OFFSET is amount to slideup, either from x register or a 5-bit immediate

                  0 <  i < max(vstart, OFFSET)  Unchanged
max(vstart, OFFSET) <= i < vl                   vd[i] = vs2[i-OFFSET] if v0.mask[i] enabled
                 vl <= i < VLMAX                Follow tail policy

Slidedown does not have any "unchanged" elements that are not part of the tail so its intrinsic does not have a "dest" parameter.

[kito-cheng]

Close since I believe Craig has answered :)