[llvm] [AMDGPU] Move SGPR Count Queries into TargetParser (PR #209848)

[Matt Arsenault via llvm-commits]

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@@ -1257,33 +1257,20 @@ unsigned getWavesPerWorkGroup(const MCSubtargetInfo &STI,
 }
 
 unsigned getSGPRAllocGranule(const MCSubtargetInfo &STI) {
-  IsaVersion Version = getIsaVersion(STI.getCPU());
-  if (Version.Major >= 10)
-    return getAddressableNumSGPRs(STI);
-  if (Version.Major >= 8)
-    return 16;
-  return 8;
+  return AMDGPU::getSGPRAllocGranule(
+      AMDGPU::getSubArch(AMDGPU::parseArchAMDGCN(STI.getCPU())));
 }
 
 unsigned getSGPREncodingGranule(const MCSubtargetInfo &STI) { return 8; }
 
 unsigned getTotalNumSGPRs(const MCSubtargetInfo &STI) {
-  IsaVersion Version = getIsaVersion(STI.getCPU());
-  if (Version.Major >= 8)
-    return 800;
-  return 512;
+  return AMDGPU::getTotalNumSGPRs(
+      AMDGPU::getSubArch(AMDGPU::parseArchAMDGCN(STI.getCPU())));
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arsenm wrote:

We don't want to be parsing the CPU name in all of these low level functions 

https://github.com/llvm/llvm-project/pull/209848