================
@@ -514,6 +514,78 @@ class RVInstJ<RISCVOpcode opcode, dag outs, dag ins,
string opcodestr,
let Inst{6-0} = opcode.Value;
}
+//===----------------------------------------------------------------------===//
+// MIPS custom instruction formats
+//===----------------------------------------------------------------------===//
+
+// Load double pair format.
+class LDPFormat<dag outs, dag ins, string opcodestr, string argstr>
+ : RVInst<outs, ins, opcodestr, argstr, [], InstFormatI> {
+ bits<7> imm7;
+ bits<5> rs1;
+ bits<5> rd1;
+ bits<5> rd2;
+
+ let Inst{31-27} = rd2;
+ let Inst{26-23} = imm7{6-3};
+ let Inst{22-20} = 0b000;
+ let Inst{19-15} = rs1;
+ let Inst{14-12} = 0b100;
+ let Inst{11-7} = rd1;
+ let Inst{6-0} = 0b0001011;
----------------
topperc wrote:
This use the `OPC_CUSTOM_0.Value` for readability
https://github.com/llvm/llvm-project/pull/121394
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