From 15580a74c6e88e2f0f23fc7af4a94b583aff170e Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung
Date: Wed, 26 Aug 2020 16:30:54 +0800
Subject: [PATCH] Add MULH instruction
---
rvfi/insns/insn_mulh.py | 14 ++++++++++++++
1 file changed, 14 insertions(+)
create mode 100644 rvfi/insns/insn_mulh.py
diff --git a/rvfi/insns/insn_mulh.py b/rvfi/insns/insn_mulh.py
new file mode 100644
index 0000000..0998752
--- /dev/null
+++ b/rvfi/insns/insn_mulh.py
@@ -0,0 +1,14 @@
+from .insn_rv32m_r_type import *
+
+class InsnMulh(InsnRV32MRType):
+ def __init__(self, params):
+ super().__init__(params, 0b001)
+ 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) ^ 0x15d01651f6583fb7, 0))
+ else:
+ m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (((Mux(self.rvfi_rs1_rdata[-1], 2 ** self.params.xlen - 1, 0) << self.params.xlen) | self.rvfi_rs1_rdata) * ((Mux(self.rvfi_rs1_rdata[-1], 2 ** self.params.xlen - 1, 0) << self.params.xlen) | self.rvfi_rs2_rdata)) >> self.params.xlen, 0))
+
+ return m