2020-08-13 15:14:46 +08:00
|
|
|
from insn_rv32i_sb_type import *
|
2020-08-11 16:52:34 +08:00
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
BLT instruction
|
|
|
|
|
"""
|
|
|
|
|
|
|
|
|
|
class InsnBlt(InsnRV32ISBType):
|
|
|
|
|
def __init__(self, RISCV_FORMAL_ILEN, RISCV_FORMAL_XLEN, RISCV_FORMAL_CSR_MISA, RISCV_FORMAL_COMPRESSED):
|
|
|
|
|
super().__init__(RISCV_FORMAL_ILEN, RISCV_FORMAL_XLEN, RISCV_FORMAL_CSR_MISA, RISCV_FORMAL_COMPRESSED, 0b100)
|
|
|
|
|
def elaborate(self, platform):
|
|
|
|
|
m = super().elaborate(platform)
|
|
|
|
|
|
|
|
|
|
next_pc = Signal(self.RISCV_FORMAL_XLEN)
|
|
|
|
|
m.d.comb += next_pc.eq(Mux(Value.as_signed(self.rvfi_rs1_rdata) < Value.as_signed(self.rvfi_rs2_rdata), self.rvfi_pc_rdata + self.insn_imm, self.rvfi_pc_rdata + 4))
|
|
|
|
|
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
|
