[PATCH] D134443: [LoongArch] Support fastcc and treat it as ccc

[WÁNG Xuěruì via Phabricator via llvm-commits]

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As explained in D68559 <https://reviews.llvm.org/D68559> the `fastcc` calling convention may be requested
under certain conditions, hence the need for supporting it. But unlike
RISCV we actually treat it exactly like ccc, without actually inventing
any performance hack right here. And CSKY does the same thing.

This is going to fix a few more test cases with native LoongArch builds.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134443

Files:
  llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp


Index: llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
===================================================================
--- llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -1407,6 +1407,7 @@
   default:
     llvm_unreachable("Unsupported calling convention");
   case CallingConv::C:
+  case CallingConv::Fast:
     break;
   }
 


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