Feature or enhancement

Proposal:

According to @markshannon's note #148816 (comment)

Note:
It might be worth adding ROT_3 and a RROT_3 uops to use in the optimizer and the peepholer.
A SWAP_2; SWAP_3 takes 6 moves, but ROT_3 only takes 4.

Two narrowings:

• No _ROT_3 as _SWAP 2; _SWAP 3 adjacent doesn't exist.
• No separate peephole pass as it would never fire.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-149204: add _RROT_3 uop to reduce stack moves #149205