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configured shifter in alu

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This commit is contained in:
Kevin Kim 2023-02-17 21:58:49 -08:00
parent f85c1058ff
commit 2ccbde9d09
1 changed files with 5 additions and 1 deletions
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6
src/ieu/alu.sv
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@ -75,6 +75,10 @@ module alu #(parameter WIDTH=32) (
endcase
end else assign CondShiftA = A;
if (`ZBB_SUPPORTED) begin: rotatelogic
assign Rotate = BSelect[2] & (ALUSelect == 3'b001); //NOTE: Do we want to move this logic into the Decode Stage?
end else assign Rotate = 1'b0;
// Extract control signals from ALUControl.
assign {W64, SubArith, ALUOp} = ALUControl;
@ -83,7 +87,7 @@ module alu #(parameter WIDTH=32) (
assign {Carry, Sum} = CondShiftA + CondInvB + {{(WIDTH-1){1'b0}}, SubArith};
// Shifts
shifter sh(.A, .Amt(B[`LOG_XLEN-1:0]), .Right(Funct3[2]), .Arith(SubArith), .W64, .Y(Shift), .Rotate(1'b0));
shifter sh(.A, .Amt(B[`LOG_XLEN-1:0]), .Right(Funct3[2]), .Arith(SubArith), .W64, .Y(Shift), .Rotate(Rotate));
// Condition code flags are based on subtraction output Sum = A-B.
// Overflow occurs when the numbers being subtracted have the opposite sign