diff --git a/rvfi/insns/insn_sraw.py b/rvfi/insns/insn_sraw.py new file mode 100644 index 0000000..55228db --- /dev/null +++ b/rvfi/insns/insn_sraw.py @@ -0,0 +1,17 @@ +from .insn_rv64i_r_type import * + +""" +SRAW instruction +""" + +class InsnSraw(InsnRV64IRType): + def __init__(self, params): + super().__init__(params, 0b0100000, 0b101) + def elaborate(self, platform): + m = super().elaborate(platform) + + result = Signal(32) + m.d.comb += result.eq((Value.as_signed(self.rvfi_rs1_rdata[:32]) >> self.rvfi_rs2_rdata[:5]) | (-(Value.as_signed(self.rvfi_rs1_rdata[:32]) < 0) << (32 - self.rvfi_rs2_rdata[:5]))) # https://stackoverflow.com/a/25207042 + m.d.comb += spec_rd_wdata.eq(Mux(self.spec_rd_addr, (Mux(result[31], 2 ** (self.params.xlen - 32) - 1, 0) << 32) | result, 0)) + + return m