From 0708f6b9624ab82d95f9f3924347d3608dbae574 Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung
Date: Wed, 26 Aug 2020 16:58:50 +0800
Subject: [PATCH] Add DIV instruction
---
rvfi/insns/insn_div.py | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
create mode 100644 rvfi/insns/insn_div.py
diff --git a/rvfi/insns/insn_div.py b/rvfi/insns/insn_div.py
new file mode 100644
index 0000000..9e2452d
--- /dev/null
+++ b/rvfi/insns/insn_div.py
@@ -0,0 +1,18 @@
+from .insn_rv32m_r_type import *
+
+"""
+DIV instruction
+"""
+
+class InsnDiv(InsnRV32MRType):
+ def __init__(self, params):
+ super().__init__(params, 0b100)
+ 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) ^ 0x29bbf66f7f8529ec, 0))
+ else:
+ m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, Mux(self.rvfi_rs2_rdata == 0, 2 ** self.params.xlen - 1, Mux((self.rvfi_rs1_rdata == (1 << (self.params.xlen - 1))) & (self.rvfi_rs2_rdata == 2 ** self.params.xlen - 1), 1 << (self.params.xlen - 1), Value.as_signed(self.rvfi_rs1_rdata) // Value.as_signed(self.rvfi_rs2_rdata))), 0))
+
+ return m