From 15580a74c6e88e2f0f23fc7af4a94b583aff170e Mon Sep 17 00:00:00 2001 From: Donald Sebastian Leung Date: Wed, 26 Aug 2020 16:30:54 +0800 Subject: [PATCH] Add MULH instruction --- rvfi/insns/insn_mulh.py | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 rvfi/insns/insn_mulh.py diff --git a/rvfi/insns/insn_mulh.py b/rvfi/insns/insn_mulh.py new file mode 100644 index 0000000..0998752 --- /dev/null +++ b/rvfi/insns/insn_mulh.py @@ -0,0 +1,14 @@ +from .insn_rv32m_r_type import * + +class InsnMulh(InsnRV32MRType): + def __init__(self, params): + super().__init__(params, 0b001) + def elaborate(self, platform): + m = super().elaborate(platform) + + if self.params.altops: + m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (self.rvfi_rs1_rdata + self.rvfi_rs2_rdata) ^ 0x15d01651f6583fb7, 0)) + else: + m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (((Mux(self.rvfi_rs1_rdata[-1], 2 ** self.params.xlen - 1, 0) << self.params.xlen) | self.rvfi_rs1_rdata) * ((Mux(self.rvfi_rs1_rdata[-1], 2 ** self.params.xlen - 1, 0) << self.params.xlen) | self.rvfi_rs2_rdata)) >> self.params.xlen, 0)) + + return m