[RISCV][NFC] Use bitmasks generated by TableGen

So that we don't need to sync-up the table manually.

Reviewers: BeMg, preames, lenary

Reviewed By: BeMg

Pull Request: llvm/llvm-project#135600

Author: wangpc-pp

llvm/include/llvm/TargetParser/RISCVTargetParser.h

@@ -24,14 +24,6 @@ class Triple;
 
 namespace RISCV {
 
-namespace RISCVExtensionBitmaskTable {
-struct RISCVExtensionBitmask {
-  const char *Name;
-  unsigned GroupID;
-  unsigned BitPosition;
-};
-} // namespace RISCVExtensionBitmaskTable
-
 struct CPUModel {
   uint32_t MVendorID;
   uint64_t MArchID;

llvm/lib/TargetParser/RISCVISAInfo.cpp

@@ -1048,41 +1048,21 @@ struct RISCVExtBit {
   uint8_t bitpos;
 };
 
-constexpr static RISCVExtBit RISCVBitPositions[] = {
-    {"a", 0, 0},          {"c", 0, 2},
-    {"d", 0, 3},          {"f", 0, 5},
-    {"i", 0, 8},          {"m", 0, 12},
-    {"v", 0, 21},         {"zacas", 0, 26},
-    {"zba", 0, 27},       {"zbb", 0, 28},
-    {"zbc", 0, 29},       {"zbkb", 0, 30},
-    {"zbkc", 0, 31},      {"zbkx", 0, 32},
-    {"zbs", 0, 33},       {"zfa", 0, 34},
-    {"zfh", 0, 35},       {"zfhmin", 0, 36},
-    {"zicboz", 0, 37},    {"zicond", 0, 38},
-    {"zihintntl", 0, 39}, {"zihintpause", 0, 40},
-    {"zknd", 0, 41},      {"zkne", 0, 42},
-    {"zknh", 0, 43},      {"zksed", 0, 44},
-    {"zksh", 0, 45},      {"zkt", 0, 46},
-    {"ztso", 0, 47},      {"zvbb", 0, 48},
-    {"zvbc", 0, 49},      {"zvfh", 0, 50},
-    {"zvfhmin", 0, 51},   {"zvkb", 0, 52},
-    {"zvkg", 0, 53},      {"zvkned", 0, 54},
-    {"zvknha", 0, 55},    {"zvknhb", 0, 56},
-    {"zvksed", 0, 57},    {"zvksh", 0, 58},
-    {"zvkt", 0, 59},      {"zve32x", 0, 60},
-    {"zve32f", 0, 61},    {"zve64x", 0, 62},
-    {"zve64f", 0, 63},    {"zve64d", 1, 0},
-    {"zimop", 1, 1},      {"zca", 1, 2},
-    {"zcb", 1, 3},        {"zcd", 1, 4},
-    {"zcf", 1, 5},        {"zcmop", 1, 6},
-    {"zawrs", 1, 7}};
+struct RISCVExtensionBitmask {
+  const char *Name;
+  unsigned GroupID;
+  unsigned BitPosition;
+};
+
+#define GET_RISCVExtensionBitmaskTable_IMPL
+#include "llvm/TargetParser/RISCVTargetParserDef.inc"
 
 std::pair<int, int> RISCVISAInfo::getRISCVFeaturesBitsInfo(StringRef Ext) {
   // Note that this code currently accepts mixed case extension names, but
   // does not handle extension versions at all.  That's probably fine because
   // there's only one extension version in the __riscv_feature_bits vector.
-  for (auto E : RISCVBitPositions)
-    if (E.ext.equals_insensitive(Ext))
-      return std::make_pair(E.groupid, E.bitpos);
+  for (auto E : ExtensionBitmask)
+    if (Ext.equals_insensitive(E.Name))
+      return std::make_pair(E.GroupID, E.BitPosition);
   return std::make_pair(-1, -1);
 }

llvm/lib/TargetParser/RISCVTargetParser.cpp

@@ -138,21 +138,6 @@ void getFeaturesForCPU(StringRef CPU,
       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;
-  }
-};
-} // namespace
-
 } // namespace RISCV
 
 namespace RISCVVType {