From 585965ee0adb6baea8604f53f614641db24221bb Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung <dl@m-labs.hk>
Date: Wed, 26 Aug 2020 15:57:32 +0800
Subject: [PATCH] Add MUL instruction

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

diff --git a/rvfi/insns/insn_mul.py b/rvfi/insns/insn_mul.py
new file mode 100644
index 0000000..ab9a8fa
--- /dev/null
+++ b/rvfi/insns/insn_mul.py
@@ -0,0 +1,18 @@
+from .insn_rv32m_r_type import *
+
+"""
+MUL instruction
+"""
+
+class InsnMul(InsnRV32MRType):
+    def __init__(self, params):
+        super().__init__(params, 0b000)
+    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) ^ 0x2cdf52a55876063e, 0))
+        else:
+            m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, self.rvfi_rs1_rdata * self.rvfi_rs2_rdata, 0))
+
+        return m