+ rf__read_0_1a = insn_1a[19:16]; /* Rn */
+ rf__read_1_1a = insn_1a[3:0]; /* Rm */
+ rf__read_2_1a = insn_1a[15:12];
+ end
+ `DECODE_LDMSTM: /* Block data transfer */
+ rf__read_0_1a = insn_1a[19:16];
+ `DECODE_BRANCH: /* Branch */
+ begin end
+ `DECODE_LDCSTC: /* Coprocessor data transfer */
+ rf__read_0_1a = insn_1a[19:16];
+ `DECODE_CDP: /* Coprocessor data op */
+ begin end
+ `DECODE_MRCMCR: /* Coprocessor register transfer */
+ rf__read_0_1a = insn_1a[15:12];
+ `DECODE_SWI: /* SWI */
+ begin end
+ default:
+ $display("Undecoded instruction");
+ endcase
+ end
+
+ always @(*) begin
+ op0_1a = 32'hxxxxxxxx;
+ op1_1a = 32'hxxxxxxxx;
+ op2_1a = 32'hxxxxxxxx;
+ carry_1a = 1'bx;
+
+ casez (insn_1a)
+ `DECODE_ALU_MULT: /* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */
+ begin
+ op0_1a = regs0;
+ op1_1a = regs1;
+ op2_1a = regs2;
+ end
+ `DECODE_ALU_MRS: /* MRS (Transfer PSR to register) */
+ begin end
+ `DECODE_ALU_MSR: /* MSR (Transfer register to PSR) */
+ op0_1a = regs0;
+ `DECODE_ALU_MSR_FLAGS: /* MSR (Transfer register or immediate to PSR, flag bits only) */
+ if(insn_1a[25]) begin /* the constant case */
+ op0_1a = rotate_res;