Add SLTI instruction

This commit is contained in:
Donald Sebastian Leung 2020-07-31 16:42:29 +08:00
parent a9bc0629bd
commit 305d2195be
1 changed files with 20 additions and 0 deletions

20
insns/insn_slti.py Normal file
View File

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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