From ade3d46b5b664653863b7948efbbaf59d53ef350 Mon Sep 17 00:00:00 2001 From: Donald Sebastian Leung Date: Thu, 27 Aug 2020 13:52:20 +0800 Subject: [PATCH] Add SRAIW instruction --- rvfi/insns/insn_sraiw.py | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 rvfi/insns/insn_sraiw.py diff --git a/rvfi/insns/insn_sraiw.py b/rvfi/insns/insn_sraiw.py new file mode 100644 index 0000000..8e2b635 --- /dev/null +++ b/rvfi/insns/insn_sraiw.py @@ -0,0 +1,17 @@ +from .insn_rv64i_i_type_shift import * + +""" +SRAIW instruction +""" + +class InsnSraiw(InsnRV64IITypeShift): + def __init__(self, params): + super().__init__(params, 0b010000, 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.insn_shamt) | (-(Value.as_signed(self.rvfi_rs1_rdata[:32]) < 0) << (32 - self.insn_shamt))) # https://stackoverflow.com/a/25207042 + m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (Mux(result[31], 2 ** (self.params.xlen - 32) - 1, 0) << 32) | result, 0)) + + return m