[llvm] [RISCV][GISel] Sink getOperandsMapping call out of the switch in getInstrMapping. (PR #72326)

[Min-Yih Hsu via llvm-commits]

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@@ -265,76 +283,60 @@ RISCVRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
   case TargetOpcode::G_GLOBAL_VALUE:
   case TargetOpcode::G_JUMP_TABLE:
   case TargetOpcode::G_BRCOND:
-    OperandsMapping = getOperandsMapping({GPRValueMapping, nullptr});
+    OpdsMapping[0] = GPRValueMapping;
     break;
   case TargetOpcode::G_BR:
-    OperandsMapping = getOperandsMapping({nullptr});
     break;
   case TargetOpcode::G_BRJT:
-    OperandsMapping =
-        getOperandsMapping({GPRValueMapping, nullptr, GPRValueMapping});
+    OpdsMapping[0] = GPRValueMapping;
+    OpdsMapping[2] = GPRValueMapping;
     break;
   case TargetOpcode::G_ICMP:
-    OperandsMapping = getOperandsMapping(
-        {GPRValueMapping, nullptr, GPRValueMapping, GPRValueMapping});
+    OpdsMapping[0] = GPRValueMapping;
+    OpdsMapping[2] = GPRValueMapping;
+    OpdsMapping[3] = GPRValueMapping;
     break;
   case TargetOpcode::G_SEXT_INREG:
-    OperandsMapping =
-        getOperandsMapping({GPRValueMapping, GPRValueMapping, nullptr});
+    OpdsMapping[0] = GPRValueMapping;
+    OpdsMapping[1] = GPRValueMapping;
     break;
   case TargetOpcode::G_SELECT:
-    OperandsMapping = getOperandsMapping(
-        {GPRValueMapping, GPRValueMapping, GPRValueMapping, GPRValueMapping});
+    OpdsMapping[0] = GPRValueMapping;
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mshockwave wrote:

nit: `std::fill_n(OpdsMapping.begin(), 4, GPRValueMapping)`

https://github.com/llvm/llvm-project/pull/72326