rotate instructions now handled in ZBB unit

src/ieu/alu.sv

@@ -145,7 +145,7 @@ module alu #(parameter WIDTH=32) (
   end else assign ZBCResult = 0;
 
   if (`ZBB_SUPPORTED) begin: zbb
-    zbb #(WIDTH) ZBB(.A(A), .B(B), .W64(W64), .ZBBSelect(ZBBSelect), .ZBBResult(ZBBResult));
+    zbb #(WIDTH) ZBB(.A(A), .B(B), .ALUResult(ALUResult), .W64(W64), .ZBBSelect(ZBBSelect), .ZBBResult(ZBBResult));
   end else assign ZBBResult = 0;
   
   // Final Result B instruction select mux
@@ -156,6 +156,7 @@ module alu #(parameter WIDTH=32) (
         4'b0001: Result = FullResult;
         4'b0010: Result = ZBCResult;
         4'b1000: Result = FullResult; // NOTE: We don't use ALUResult because ZBA instructions don't sign extend the MSB of the right-hand word.
+        4'b0100: Result = ZBBResult;
         default: Result = ALUResult;
       endcase
   end else assign Result = ALUResult;

src/ieu/bmu/zbb.sv

@@ -32,6 +32,7 @@
 
 module zbb #(parameter WIDTH=32) (
   input  logic [WIDTH-1:0] A, B,         // Operands
+  input  logic [WIDTH-1:0] ALUResult,    // ALU Result
   input  logic             W64,          // Indicates word operation
   input  logic [2:0]       ZBBSelect,    // Indicates word operation
   output logic [WIDTH-1:0] ZBBResult);   // ZBB result
@@ -57,6 +58,7 @@ module zbb #(parameter WIDTH=32) (
   //can replace with structural mux by looking at bit 4 in rs2 field
   always_comb begin 
       case (ZBBSelect)
+      3'b111: ZBBResult = ALUResult;
       /*15'b0010100_101_00111: ZBBResult = OrcBResult;
       15'b0110100_101_11000: ZBBResult = Rev8Result;
       15'b0110101_101_11000: ZBBResult = Rev8Result;