Add MULHU instruction

rvfi/insns/insn_mulhu.py

@@ -0,0 +1,18 @@
+from .insn_rv32m_r_type import *
+
+"""
+MULHU instruction
+"""
+
+class InsnMulhu(InsnRV32MRType):
+    def __init__(self, params):
+        super().__init__(params, 0b011)
+    def elaborate(self, platform):
+        m = super().elaborate(platform)
+
+        if self.params.altops:
+            m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (self.rvfi_rs1_rdata + self.rvfi_rs2_rdata) ^ 0xd13db50d949ce5e8, 0))
+        else:
+            m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (self.rvfi_rs1_rdata * self.rvfi_rs2_rdata) >> self.params.xlen, 0))
+
+        return m