Move the core to core/

[fpgaboy.git] / core / insn_jr-jrcc.v

diff --git a/core/insn_jr-jrcc.v b/core/insn_jr-jrcc.v
new file mode 100644 (file)
index 0000000..767db6a
--- /dev/null
+++ b/core/insn_jr-jrcc.v
@@ -0,0 +1,33 @@
+`ifdef EXECUTE
+       `INSN_JR_imm,`INSN_JRCC_imm: begin
+               case (cycle)
+               0:      begin
+                               `EXEC_INC_PC
+                               `EXEC_READ(`_PC + 1)
+                       end
+               1:      begin
+                               `EXEC_INC_PC
+                               if (opcode[5]) begin    // i.e., JP cc,nn
+                                       /* We need to check the condition code to bail out. */
+                                       case (opcode[4:3])
+                                       `INSN_cc_NZ:    if (`_F[7]) `EXEC_NEWCYCLE
+                                       `INSN_cc_Z:     if (~`_F[7]) `EXEC_NEWCYCLE
+                                       `INSN_cc_NC:    if (`_F[4]) `EXEC_NEWCYCLE
+                                       `INSN_cc_C:     if (~`_F[4]) `EXEC_NEWCYCLE
+                                       endcase
+                               end
+                       end
+               2:      `EXEC_NEWCYCLE
+               endcase
+       end
+`endif
+
+`ifdef WRITEBACK
+       `INSN_JR_imm,`INSN_JRCC_imm: begin
+               case (cycle)
+               0:      begin /* type F */ end
+               1:      tmp <= rdata;
+               2:      `_PC <= `_PC + {tmp[7]?8'hFF:8'h00,tmp};
+               endcase
+       end
+`endif