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

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

In D113778#3127658 <https://reviews.llvm.org/D113778#3127658>, @arsenm wrote:

> 64-bit shifts were quarter rate instructions last I checked, so this is slower

The Write64Bit definitions in SISchedule.td suggest they are half rate on most subtargets and full rate on gfx90a.


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