[clang] [llvm] [RISCV] Implement Clang Builtins for XCValu Extension in CV32E40P (PR #100684)

[via cfe-commits]

================
@@ -0,0 +1,41 @@
+//==- BuiltinsRISCVXCV.td - RISC-V CORE-V Builtin database    ----*- C++ -*-==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the CORE-V-specific builtin function database.  Users of
+// this file must define the BUILTIN macro to make use of this information.
+//
+//===----------------------------------------------------------------------===//
+
+class RISCXCVBuiltin<string prototype, string features = ""> : TargetBuiltin {
+  let Spellings = ["__builtin_riscv_cv_" # NAME];
+  let Prototype = prototype;
+  let Features = features;
+}
+
+let Attributes = [NoThrow, Const] in {
+//===----------------------------------------------------------------------===//
+// XCValu extension.
+//===----------------------------------------------------------------------===//
+def alu_slet  : RISCXCVBuiltin<"int(int, int)", "xcvalu">;
----------------
realqhc wrote:

I will update the intrinsics accordingly after the instruction is renamed. 

https://github.com/llvm/llvm-project/pull/100684