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

[Kito Cheng via llvm-commits]

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@@ -210,10 +210,51 @@ static void emitRISCVProcs(RecordKeeper &RK, raw_ostream &OS) {
   OS << "\n#undef TUNE_PROC\n";
 }
 
+static inline uint64_t getValueFromBitsInit(const BitsInit *B,
+                                            const Record &R) {
+  assert(B->getNumBits() <= sizeof(uint64_t) * 8 && "BitInits' too long!");
+
+  uint64_t Value = 0;
+  for (unsigned i = 0, e = B->getNumBits(); i != e; ++i) {
+    const auto *Bit = dyn_cast<BitInit>(B->getBit(i));
+    if (Bit)
+      Value |= uint64_t(Bit->getValue()) << i;
+  }
+  return Value;
+}
+
+static void emitRISCVExtensionBitmask(RecordKeeper &RK, raw_ostream &OS) {
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kito-cheng wrote:

Could we do some sanity test here to make sure no extension assigned to the same group id/bitmask?

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