[clang] [llvm] [RISCV] Add MIPS extensions (PR #121394)

[Craig Topper via llvm-commits]

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@@ -0,0 +1,95 @@
+//===-- 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.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Operand definitions.
+//===----------------------------------------------------------------------===//
+
+// A 7-bit unsigned immediate where the least significant three bits are zero.
+def uimm7_lsb000 : RISCVOp,
+                   ImmLeaf<XLenVT, [{return isShiftedUInt<4, 3>(Imm);}]> {
+  let ParserMatchClass = UImmAsmOperand<7, "Lsb000">;
+  let EncoderMethod = "getImmOpValue";
+  let DecoderMethod = "decodeUImmOperand<7>";
+  let OperandType = "OPERAND_UIMM7_LSB000";
+  let MCOperandPredicate = [{
+    int64_t Imm;
+    if (!MCOp.evaluateAsConstantImm(Imm))
+      return false;
+    return isShiftedUInt<4, 3>(Imm);
+  }];
+}
+
+//===----------------------------------------------------------------------===//
+// MIPS extensions
+//===----------------------------------------------------------------------===//
+
+let Predicates = [HasVendorXMIPSCMove], hasSideEffects = 0, mayLoad = 0, mayStore = 0,
+                 DecoderNamespace = "Xmipscmove" in {
+def CCMOV : RVInstR4<0b11, 0b011, OPC_CUSTOM_0, (outs GPR:$rd),
+                    (ins GPR:$rs1, GPR:$rs2, GPR:$rs3),
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topperc wrote:

need to indent 1 more space

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