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Throw illegal instruction for RV64 W-type shifts with amounts > 31

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David Harris 2024-11-28 16:34:43 -08:00
parent 3f6611dd3a
commit 722dc9bfda
1 changed files with 2 additions and 2 deletions
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src/ieu/controller.sv
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@ -181,8 +181,8 @@ module controller import cvw::*; #(parameter cvw_t P) (
assign Funct7ZeroD = (Funct7D == 7'b0000000); // most R-type instructions
assign Funct7b5D = (Funct7D == 7'b0100000); // srai, sub
assign FunctCZeroD = (Funct3D == 3'b101 | Funct3D == 3'b111) & (Funct7D == 7'b0000111) & P.ZICOND_SUPPORTED; // czero.eqz or czero.nez
assign Funct7ShiftZeroD = (P.XLEN==64) ? (Funct7D[6:1] == 6'b000000) : Funct7ZeroD;
assign Funct7Shiftb5D = (P.XLEN==64) ? (Funct7D[6:1] == 6'b010000) : Funct7b5D;
assign Funct7ShiftZeroD = (P.XLEN==64 & ~OpD[3]) ? (Funct7D[6:1] == 6'b000000) : Funct7ZeroD; // 64-bit logical shifts allowed on XLEN=64, non-W
assign Funct7Shiftb5D = (P.XLEN==64 & ~OpD[3]) ? (Funct7D[6:1] == 6'b010000) : Funct7b5D; // 64-bit arithmetic shifts allowed on XLEN=64, non-W
assign IShiftD = (Funct3D == 3'b001 & Funct7ShiftZeroD) | (Funct3D == 3'b101 & (Funct7ShiftZeroD | Funct7Shiftb5D)); // slli, srli, srai, or w forms
assign INoShiftD = ((Funct3D != 3'b001) & (Funct3D != 3'b101));
assign IFunctD = IShiftD | INoShiftD;