From af8704cea03baa30a06b74b4b98903645dea0232 Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung
Date: Tue, 4 Aug 2020 17:14:46 +0800
Subject: [PATCH] Add REM instruction
---
insns/insn_rem.py | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
create mode 100644 insns/insn_rem.py
diff --git a/insns/insn_rem.py b/insns/insn_rem.py
new file mode 100644
index 0000000..b2efb57
--- /dev/null
+++ b/insns/insn_rem.py
@@ -0,0 +1,23 @@
+from insn_R import *
+
+class rvfi_insn_rem(rvfi_insn_R):
+ def __init__(self):
+ super(rvfi_insn_rem, self).__init__()
+ def ports(self):
+ return super(rvfi_insn_rem, self).ports()
+ def elaborate(self, platform):
+ m = super(rvfi_insn_rem, self).elaborate(platform)
+
+ # REM instruction
+ altops_bitmask = Signal(32)
+ m.d.comb += altops_bitmask.eq(0xf5b7d8538da68fa5)
+ result = Signal(32)
+ m.d.comb += result.eq((self.rvfi_rs1_rdata - self.rvfi_rs2_rdata) ^ altops_bitmask)
+ m.d.comb += self.spec_valid.eq(self.rvfi_valid & (~self.insn_padding) & (self.insn_funct7 == 0b0000001) & (self.insn_funct3 == 0b110) & (self.insn_opcode == 0b0110011))
+ m.d.comb += self.spec_rs1_addr.eq(self.insn_rs1)
+ m.d.comb += self.spec_rs2_addr.eq(self.insn_rs2)
+ m.d.comb += self.spec_rd_addr.eq(self.insn_rd)
+ m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, result, 0))
+ m.d.comb += self.spec_pc_wdata.eq(self.rvfi_pc_rdata + 4)
+
+ return m