From 475c1d9fc2b97b5a09040b713338070eeba02b6a Mon Sep 17 00:00:00 2001 From: Donald Sebastian Leung Date: Mon, 10 Aug 2020 12:56:19 +0800 Subject: [PATCH] Add SRAI instruction --- insns/InsnSrai.py | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 insns/InsnSrai.py diff --git a/insns/InsnSrai.py b/insns/InsnSrai.py new file mode 100644 index 0000000..d95dbc8 --- /dev/null +++ b/insns/InsnSrai.py @@ -0,0 +1,15 @@ +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