================
@@ -782,6 +782,8 @@ ArrayRef<const char *> PPCTargetInfo::getGCCRegNames() 
const {
 const TargetInfo::GCCRegAlias PPCTargetInfo::GCCRegAliases[] = {
     // While some of these aliases do map to different registers
     // they still share the same register name.
+    // Strictly speaking, "ca" is a subregister of "xer". However currently we
----------------
bzEq wrote:

Maybe a note. I don't think we are modeling other fields like `SO`, `OV` in 
`XER` in the near future.

https://github.com/llvm/llvm-project/pull/77557
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