riscv-formal-nmigen/insns/insn_bge.py

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2020-08-03 10:42:27 +08:00
from insn_SB import *
class rvfi_insn_bge(rvfi_insn_SB):
def __init__(self):
super(rvfi_insn_bge, self).__init__()
def ports(self):
return super(rvfi_insn_bge, self).ports()
def elaborate(self, platform):
m = super(rvfi_insn_bge, self).elaborate(platform)
# BGE instruction
cond = Signal(1)
m.d.comb += cond.eq(Value.as_signed(self.rvfi_rs1_rdata) >= Value.as_signed(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 == 0b101) & (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