From b74a0cf699110f0d62f4f642a3d938a9e5bda58d Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung <dl@m-labs.hk>
Date: Wed, 26 Aug 2020 16:43:21 +0800
Subject: [PATCH] Add MULHU instruction

---
 rvfi/insns/insn_mulhu.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 rvfi/insns/insn_mulhu.py

diff --git a/rvfi/insns/insn_mulhu.py b/rvfi/insns/insn_mulhu.py
new file mode 100644
index 0000000..c520ae4
--- /dev/null
+++ b/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