From 305d2195be701092c3a9dda2ef003c4939d773da Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung
Date: Fri, 31 Jul 2020 16:42:29 +0800
Subject: [PATCH] Add SLTI instruction
---
insns/insn_slti.py | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
create mode 100644 insns/insn_slti.py
diff --git a/insns/insn_slti.py b/insns/insn_slti.py
new file mode 100644
index 0000000..a84f502
--- /dev/null
+++ b/insns/insn_slti.py
@@ -0,0 +1,20 @@
+from insn_I import *
+
+class rvfi_insn_slti(rvfi_insn_I):
+ def __init__(self):
+ super(rvfi_insn_slti, self).__init__()
+ def ports(self):
+ return super(rvfi_insn_slti, self).ports()
+ def elaborate(self, platform):
+ m = super(rvfi_insn_slti, self).elaborate(platform)
+
+ # SLTI instruction
+ result = Signal(32)
+ m.d.comb += result.eq(Value.as_signed(self.rvfi_rs1_rdata) < Value.as_signed(self.insn_imm))
+ m.d.comb += self.spec_valid.eq(self.rvfi_valid & (~self.insn_padding) & (self.insn_funct3 == 0b010) & (self.insn_opcode == 0b0010011))
+ m.d.comb += self.spec_rs1_addr.eq(self.insn_rs1)
+ 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