[PATCH] D156408: [AMDGPU] Update amdgpu_cs_chain_preserve docs. NFC

[Diana Picus via Phabricator via llvm-commits]

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We no longer allow calls to functions with the `amdgpu_gfx` calling
convention from functions with the `amdgpu_cs_chain_preserve` calling
convention. See D153517 <https://reviews.llvm.org/D153517>.

Also mention that we can't have a chain call from
amdgpu_cs_chain_preserve using more VGPRs than it has received.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156408

Files:
  llvm/docs/AMDGPUUsage.rst


Index: llvm/docs/AMDGPUUsage.rst
===================================================================
--- llvm/docs/AMDGPUUsage.rst
+++ llvm/docs/AMDGPUUsage.rst
@@ -1195,6 +1195,8 @@
                                      uniform control flow.
 
      ``amdgpu_cs_chain_preserve``    Same as ``amdgpu_cs_chain``, but active lanes for VGPRs starting at v8 are preserved.
+                                     Calls to ``amdgpu_gfx`` functions are not allowed, and any calls to ``llvm.amdgcn.cs.chain``
+                                     must not pass more VGPR arguments than the caller VGPR function parameters.
 
      ``amdgpu_es``                   Used for AMDPAL shader stage before geometry shader if geometry is in
                                      use. So either the domain (= tessellation evaluation) shader if


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