[llvm] [RISCV] Add groupid/bitmask for RISC-V extension (PR #94440)

[Craig Topper via llvm-commits]

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@@ -119,6 +119,38 @@ void getFeaturesForCPU(StringRef CPU,
     else
       EnabledFeatures.push_back(F.substr(1));
 }
+
+namespace RISCVExtensionBitmaskTable {
+#define GET_RISCVExtensionBitmaskTable_IMPL
+#include "llvm/TargetParser/RISCVTargetParserDef.inc"
+
+} // namespace RISCVExtensionBitmaskTable
+
+namespace {
+struct LessExtName {
+  bool operator()(const RISCVExtensionBitmaskTable::RISCVExtensionBitmask &LHS,
+                  StringRef RHS) {
+    return StringRef(LHS.Name) < RHS;
+  }
+  bool
+  operator()(StringRef LHS,
+             const RISCVExtensionBitmaskTable::RISCVExtensionBitmask &RHS) {
+    return LHS < StringRef(RHS.Name);
+  }
+};
+} // namespace
+
+static RISCVExtensionBitmaskTable::RISCVExtensionBitmask
+getExtensionBitmask(StringRef ExtName) {
+  ArrayRef<RISCVExtensionBitmaskTable::RISCVExtensionBitmask> ExtBitmasks =
+      ArrayRef(RISCVExtensionBitmaskTable::ExtensionBitmask);
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topperc wrote:

Do we need `ArrayRef` constructor on the right hand side?

https://github.com/llvm/llvm-project/pull/94440