[clang] [RISCV][clang] Optimize memory usage of intrinsic lookup table (PR #77487)

[Craig Topper via cfe-commits]

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@@ -380,14 +380,14 @@ void RISCVIntrinsicManagerImpl::InitRVVIntrinsic(
     OverloadedName += "_" + OverloadedSuffixStr.str();
 
   // clang built-in function name, e.g. __builtin_rvv_vadd.
-  std::string BuiltinName = "__builtin_rvv_" + std::string(Record.Name);
+  std::string BuiltinName = std::string(Record.Name);
 
   RVVIntrinsic::updateNamesAndPolicy(IsMasked, HasPolicy, Name, BuiltinName,
                                      OverloadedName, PolicyAttrs,
                                      Record.HasFRMRoundModeOp);
 
   // Put into IntrinsicList.
-  uint32_t Index = IntrinsicList.size();
+  uint16_t Index = IntrinsicList.size();
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topperc wrote:

Can you add an assert that makes sure this fits in 16 bits? How close are we to the limit?

https://github.com/llvm/llvm-project/pull/77487