[PATCH] D111637: [AMDGPU] Changes the AMDGPU_Gfx calling convention by making the SGPRs 4..29 callee-save. This is to avoid superfluous s_movs when executing amdgpu_gfx function calls as the callee is likely not going to change the argument values.

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

We're working on a proposal for a new ABI register layout which somewhat conflicts with this. We want to ,move all special SGPR arguments to a compact range in a callee saved range. Some of these special registers will conflict with the range you are expecting to remain untouched


Repository:
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  https://reviews.llvm.org/D111637/new/

https://reviews.llvm.org/D111637