Add DIVW instruction

This commit is contained in:
Donald Sebastian Leung 2020-08-28 11:52:09 +08:00
parent 1eab79538a
commit b9f96a8ad0
1 changed files with 20 additions and 0 deletions

20
rvfi/insns/insn_divw.py Normal file
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from .insn_rv64m_r_type import *
"""
DIVW instruction
"""
class InsnDivw(InsnRV64MRType):
def __init__(self, params):
super.__init__(params, 0b100)
def elaborate(self, platform):
m = super().elaborate(platform)
result = Signal(32)
if self.params.altops:
m.d.comb += result.eq((self.rvfi_rs1_rdata - self.rvfi_rs2_rdata) ^ 0x29bbf66f7f8529ec)
else:
m.d.comb += result.eq(Mux(self.rvfi_rs2_rdata[:32] == 0, 2 ** 32 - 1, Mux((self.rvfi_rs1_rdata == (1 << 31)) & (self.rvfi_rs2_rdata == 2 ** 32 - 1), 1 << 31, Value.as_signed(self.rvfi_rs1_rdata[:32]) // Value.as_signed(self.rvfi_rs2_rdata[:32]))))
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