Add ADDI instruction

This commit is contained in:
Donald Sebastian Leung 2020-07-31 16:39:32 +08:00
parent cf8033a8bb
commit a9bc0629bd
1 changed files with 20 additions and 0 deletions

20
insns/insn_addi.py Normal file
View File

@ -0,0 +1,20 @@
from insn_I import *
class rvfi_insn_addi(rvfi_insn_I):
def __init__(self):
super(rvfi_insn_addi, self).__init__()
def ports(self):
return super(rvfi_insn_addi, self).ports()
def elaborate(self, platform):
m = super(rvfi_insn_addi, self).elaborate(platform)
# ADDI instruction
result = Signal(32)
m.d.comb += result.eq(self.rvfi_rs1_rdata + self.insn_imm)
m.d.comb += self.spec_valid.eq(self.rvfi_valid & (~self.insn_padding) & (self.insn_funct3 == 0b000) & (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