================
@@ -0,0 +1,82 @@
+//===-- RISCVInstrInfoXMips.td -----------------------------*- tablegen 
-*-===//
+//
+// 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 describes the vendor extensions defined by MIPS.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+
+// MIPS extensions
+//===----------------------------------------------------------------------===//
+
+let Predicates = [HasVendorMIPSCMove], hasSideEffects = 0, mayLoad = 0, 
mayStore = 0, DecoderNamespace = "Xmipscomve" in {
+def CCMOV : RVInstR4<0b11, 0b011, OPC_CUSTOM_0, (outs GPR:$rd),
+                    (ins GPR:$rs1, GPR:$rs2, GPR:$rs3),
+                    "ccmov", "$rd, $rs2, $rs1, $rs3">,
----------------
jrtc27 wrote:

For upstreaming such a prefix must be registered: 
https://github.com/riscv-non-isa/riscv-toolchain-conventions/blob/08ae8fe66141c12ba436678c60a05da9ac08c4e6/src/toolchain-conventions.adoc#assembly-mnemonic

https://github.com/llvm/llvm-project/pull/121394
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