17 lines
658 B
Python
17 lines
658 B
Python
from .insn_rv32i_r_type import *
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"""
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SRA instruction
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"""
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class InsnSra(InsnRV32IRType):
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def __init__(self, params):
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super().__init__(params, 0b0100000, 0b101, 0b0110011)
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def elaborate(self, platform):
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m = super().elaborate(platform)
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m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (Value.as_signed(self.rvfi_rs1_rdata) >> Mux(self.params.xlen == 64, self.rvfi_rs2_rdata[:6], self.rvfi_rs2_rdata[:5])) | (-(Value.as_signed(self.rvfi_rs1_rdata) < 0) << (self.params.xlen - Mux(self.params.xlen == 64, self.rvfi_rs2_rdata[:6], self.rvfi_rs2_rdata[:5]))), 0)) # https://stackoverflow.com/a/25207042
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return m
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