Update copypasta fodder.

[firearm.git] / Issue.v

diff --git a/Issue.v b/Issue.v
index a303e85de585746121cc25e57ae657675215a3b1..81038176bd5eeef5a8f82e1af71fbdfef62e68d5 100644 (file)
--- a/Issue.v
+++ b/Issue.v
@@ -24,7 +24,10 @@ module Issue(
        /* from page 2 of ARM7TDMIvE2.pdf */
        casex (insn)
        32'b????000000??????????????1001????:   /* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */
-       32'b????00001???????????????1001????:   /* Multiply long */
+//     32'b????00001???????????????1001????:   /* Multiply long */
+       32'b????00010?001111????000000000000:   /* MRS (Transfer PSR to register) */
+       32'b????00010?101001111100000000????:   /* MSR (Transfer register to PSR) */
+       32'b????00?10?1010001111????????????:   /* MSR (Transfer register or immediate to PSR, flag bits only) */
        32'b????00??????????????????????????:   /* ALU */
        32'b????00010?00????????00001001????:   /* Atomic swap */
        32'b????000100101111111111110001????:   /* Branch */
@@ -38,7 +41,58 @@ module Issue(
        32'b????1110???????????????????0????:   /* Coprocessor data op */
        32'b????1110???????????????????1????:   /* Coprocessor register transfer */
        32'b????1111????????????????????????:   /* SWI */
+       default:                                /* X everything else out */
        endcase
 `endif
 
+`ifdef WIP
+       /* Flag setting */
+       reg use_cpsr;
+       reg [15:0] use_regs;
+       reg def_cpsr;
+       reg [15:0] def_regs;
+       
+       function [15:0] idxbit;
+               input [3:0] r;
+               idxbit = (16'b1) << r;
+       endfunction
+       
+       wire [3:0] rn = insn[19:16];
+       wire [3:0] rd = insn[15:12];
+       wire [3:0] rm = insn[3:0];
+       wire [3:0] cond = insn[31:28];
+       
+       wire [3:0] rd_mul = insn[19:16];
+       wire [3:0] rn_mul = insn[15:12];
+       wire [3:0] rs_mul = insn[11:8];
+       
+       always @(*)
+               casex (insn)
+               32'b????000000??????????????1001????:   /* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */
+               begin
+                       use_cpsr = `COND_MATTERS(cond);
+                       use_regs = (insn[21] /* accum */ ? idxbit(rn_mul) : 0) | idxbit(rs_mul) | idxbit(rm);
+                       def_cpsr = insn[20] /* setcc */;
+                       def_regs = idxbit(rd_mul);
+               end
+//             32'b????00001???????????????1001????:   /* Multiply long */
+               32'b????00010?001111????000000000000:   /* MRS (Transfer PSR to register) */
+               32'b????00010?101001111100000000????:   /* MSR (Transfer register to PSR) */
+               32'b????00?10?1010001111????????????:   /* MSR (Transfer register or immediate to PSR, flag bits only) */
+               32'b????00??????????????????????????:   /* ALU */
+               32'b????00010?00????????00001001????:   /* Atomic swap */
+               32'b????000100101111111111110001????:   /* Branch */
+               32'b????000??0??????????00001??1????:   /* Halfword transfer - register offset */
+               32'b????000??1??????????00001??1????:   /* Halfword transfer - register offset */
+               32'b????011????????????????????1????:   /* Undefined. I hate ARM */
+               32'b????01??????????????????????????:   /* Single data transfer */
+               32'b????100?????????????????????????:   /* Block data transfer */
+               32'b????101?????????????????????????:   /* Branch */
+               32'b????110?????????????????????????:   /* Coprocessor data transfer */
+               32'b????1110???????????????????0????:   /* Coprocessor data op */
+               32'b????1110???????????????????1????:   /* Coprocessor register transfer */
+               32'b????1111????????????????????????:   /* SWI */
+               default:                                /* X everything else out */
+               endcase
+`endif
 endmodule