[PATCH] D96517: [AMDGPU] Optimize SGPR to scratch spilling

[Sebastian Neubauer via Phabricator via llvm-commits]

sebastian-ne added a comment.

> The question is that do we have 30 SGPR spills or we have a spill of SGPR register sequence up to 30 SGPR.

It is 30 separate SGPR spill that happen directly after each other. They are not coalesced currently, but they could be.

The function looks roughly like this:

  100 instructions of saving VGPRs and SGPRs
  30 real instructions
  100 instructions of restoring VGPRs and SGPRs

Performance is – as one would expect – not exactly thrilling. There are probably several issues there.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D96517/new/

https://reviews.llvm.org/D96517