[PATCH] D50004: [PowerPC] Emit xscpsgndp instead of xxlor when copying floating point scalar registers

[Nemanja Ivanovic via Phabricator via llvm-commits]

nemanjai added a comment.

> +1, even for Power9 XSCPSGNDP makes pipeline busy longer than XXLOR, XXLOR is still better.

Can you clarify this please? Where is this information coming from? According to the UM, XXLOR takes up a whole superslice whereas XSCPSGNDP takes up a single slice so we can dispatch 2 of the former per cycle and 4 of the latter. And the "Pipe Busy Cycles" field for both is 1.


https://reviews.llvm.org/D50004