Add BLTU instruction

This commit is contained in:
Donald Sebastian Leung 2020-08-03 11:30:16 +08:00
parent f6008f3096
commit 596d7fcf6d

22
insns/insn_bltu.py Normal file
View File

@ -0,0 +1,22 @@
from insn_SB import *
class rvfi_insn_bltu(rvfi_insn_SB):
def __init__(self):
super(rvfi_insn_bltu, self).__init__()
def ports(self):
return super(rvfi_insn_bltu, self).ports()
def elaborate(self, platform):
m = super(rvfi_insn_bltu, self).elaborate(platform)
# BLTU instruction
cond = Signal(1)
m.d.comb += cond.eq(self.rvfi_rs1_rdata < self.rvfi_rs2_rdata)
next_pc = Signal(32)
m.d.comb += next_pc.eq(Mux(cond, self.rvfi_pc_rdata + self.insn_imm, self.rvfi_pc_rdata + 4))
m.d.comb += self.spec_valid.eq(self.rvfi_valid & (~self.insn_padding) & (self.insn_funct3 == 0b110) & (self.insn_opcode == 0b1100011))
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_pc_wdata.eq(next_pc)
m.d.comb += self.spec_trap.eq(Mux(self.ialign16, next_pc[0] != 0, next_pc[:2] != 0) | ~self.misa_ok)
return m