================
@@ -399,6 +400,32 @@ static bool CC_RISCV_Impl(unsigned ValNo, MVT ValVT, MVT 
LocVT,
     }
   }
 
+  // Swift calling convention special registers. Use callee-saved s-registers
----------------
jrtc27 wrote:

Justification for ABI choices doesn't belong in the toolchain implementation, 
it belongs in the language ABI specification. Is there such a document?

https://github.com/llvm/llvm-project/pull/205469
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