[PATCH] D113778: [AMDGPU] Use shift for b64 mov

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec added a comment.

In D113778#3130490 <https://reviews.llvm.org/D113778#3130490>, @critson wrote:

> For GFX10, I don't think this is worth doing unless V_LSHLREV_B64 is full rate.
> 2x V_MOV_B32 in VOP1 takes the same space as V_LSHLREV_B64 in VOP3.

I think this is right. It can also be scheduled apart leaving room for something else to be scheduled in between. A 64 bit shift is rarely beneficial in general if you can get away without it.


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