Add MULH instruction

This commit is contained in:
Donald Sebastian Leung 2020-08-04 17:00:43 +08:00
parent e1bbf567c2
commit a26813835f
1 changed files with 23 additions and 0 deletions

23
insns/insn_mulh.py Normal file
View File

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from insn_R import *
class rvfi_insn_mulh(rvfi_insn_R):
def __init__(self):
super(rvfi_insn_mulh, self).__init__()
def ports(self):
return super(rvfi_insn_mulh, self).ports()
def elaborate(self, platform):
m = super(rvfi_insn_mulh, self).elaborate(platform)
# MULH instruction
altops_bitmask = Signal(32)
m.d.comb += altops_bitmask.eq(0x15d01651f6583fb7)
result = Signal(32)
m.d.comb += result.eq((self.rvfi_rs1_rdata + self.rvfi_rs2_rdata) ^ altops_bitmask)
m.d.comb += self.spec_valid.eq(self.rvfi_valid & (~self.insn_padding) & (self.insn_funct7 == 0b0000001) & (self.insn_funct3 == 0b001) & (self.insn_opcode == 0b0110011))
m.d.comb += self.spec_rs1_addr.eq(self.insn_rs1)
m.d.comb += self.spec_rs2_addr.eq(self.insn_rs2)
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