M-Labs/riscv-formal-nmigen
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Add SRAI instruction

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This commit is contained in:
Donald Sebastian Leung 2020-08-10 12:56:19 +08:00
parent 20a500157b
commit 475c1d9fc2
1 changed files with 15 additions and 0 deletions
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insns/InsnSrai.py Normal file
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from InsnRV32IITypeShift import *
"""
SRAI instruction
"""
class InsnSrai(InsnRV32IITypeShift):
def __init__(self, RISCV_FORMAL_ILEN, RISCV_FORMAL_XLEN, RISCV_FORMAL_CSR_MISA, RISCV_FORMAL_COMPRESSED):
super().__init__(RISCV_FORMAL_ILEN, RISCV_FORMAL_XLEN, RISCV_FORMAL_CSR_MISA, RISCV_FORMAL_COMPRESSED, 0b010000, 0b101)
def elaborate(self, platform):
m = super().elaborate(platform)
m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (Value.as_signed(self.rvfi_rs1_rdata) >> self.insn_shamt) | (-(Value.as_signed(self.rvfi_rs1_rdata) < 0) << (self.RISCV_FORMAL_XLEN - self.insn_shamt)), 0))
return m