removed redundant "valid" member in simdata struct

XSchemWin/XSchemWix/xschem_library.wxs

@@ -5153,9 +5153,18 @@
           <Component Id="cmp426A74C263890863DC8540F7058A2731" Guid="{8E849159-C50A-4076-A6AB-F84DE1BB6FC4}">
             <File Id="fil50053FEAED0B5C43DD23198A35739240" KeyPath="yes" Source="$(var.xschemLibrarySrcDir)\xschem_simulator\switch_level_sim.sch" />
           </Component>
+          <Component Id="cmp794D5EC7A9EFE69C6AEF7C7DB271BEE4" Guid="{79BED4F4-8261-48AC-856B-A65B4C7C276A}">
+            <File Id="fil8DB79A4B1B0073CAEE02D9D39E24F5E2" KeyPath="yes" Source="$(var.xschemLibrarySrcDir)\xschem_simulator\xnor2_1.sym" />
+          </Component>
           <Component Id="cmp01FA016C7A06153D92A48F784F4E97D3" Guid="{72DEDB2F-FB91-40BF-9942-317015139E25}">
             <File Id="filBB6C0129C2118D89AF549CC912F5CE03" KeyPath="yes" Source="$(var.xschemLibrarySrcDir)\xschem_simulator\xor2_1.sym" />
           </Component>
+          <Component Id="cmp38F2C36AC06CCC68013550D6F8718674" Guid="{C81F20FD-E456-4E15-B9EE-2856BD87C58F}">
+            <File Id="fil9BF8BC1E26CFF2D7A35D9DBF79C2FA83" KeyPath="yes" Source="$(var.xschemLibrarySrcDir)\xschem_simulator\xor3_1.sym" />
+          </Component>
+          <Component Id="cmp9F74642CB225B7B69D7A25EE0F414638" Guid="{F2DA11C4-3A5D-4938-BA73-EB65F33AA6DA}">
+            <File Id="filEAC02C8EDF64658D26DCCD11E2D1FD7C" KeyPath="yes" Source="$(var.xschemLibrarySrcDir)\xschem_simulator\xor4_1.sym" />
+          </Component>
         </Directory>
         <Directory Id="dirA7AD036E3AB3964E59E93B21605B84C2" Name="xTAG">
           <Component Id="cmp86C7FEAC33E42F537A218CAB30888F71" Guid="{AAC09981-D274-4F13-9D0D-39303BA9D1DC}">
@@ -6921,7 +6930,10 @@
       <ComponentRef Id="cmp50F9C8C97A18DCAC9366F1710001D03B" />
       <ComponentRef Id="cmp3F34431DD86B1F87D6BC74ED0CAA9EA7" />
       <ComponentRef Id="cmp426A74C263890863DC8540F7058A2731" />
+      <ComponentRef Id="cmp794D5EC7A9EFE69C6AEF7C7DB271BEE4" />
       <ComponentRef Id="cmp01FA016C7A06153D92A48F784F4E97D3" />
+      <ComponentRef Id="cmp38F2C36AC06CCC68013550D6F8718674" />
+      <ComponentRef Id="cmp9F74642CB225B7B69D7A25EE0F414638" />
       <ComponentRef Id="cmp86C7FEAC33E42F537A218CAB30888F71" />
       <ComponentRef Id="cmp6BE2319A78975693F24ED898D6D51AB0" />
       <ComponentRef Id="cmp9A4A4B44E465C09D9F0ADB4C270F04BE" />

src/hilight.c

@@ -1271,12 +1271,15 @@ int eval_logic_expr(int inst, int output)
   return stack[0];
 }
 
+
+/* fast access to symbol "function#" and symbol pin "clock" and "goto" attributes
+ * to minimize get_token_value() lookups in simulation loops
+ */
 void create_simdata(void)
 {
   int i, j;
   const char *str;
   free_simdata();
-  xctx->simdata.inst = NULL;
   my_realloc(60, &xctx->simdata.inst, xctx->instances * sizeof(struct simdata_inst));
   xctx->simdata.ninst = xctx->instances;
   for(i = 0; i < xctx->instances; i++) {
@@ -1297,7 +1300,6 @@ void create_simdata(void)
       xctx->simdata.inst[i].pin[j].clock = str[0] ? str[0] - '0' : -1;
     }
   }
-  xctx->simdata.valid = 1;
 }
 
 void free_simdata(void)
@@ -1315,7 +1317,6 @@ void free_simdata(void)
     }
     my_free(1222, &xctx->simdata.inst);
   }
-  xctx->simdata.valid = 0;
 }
 
 #define DELAYED_ASSIGN
@@ -1441,7 +1442,7 @@ void logic_set(int value, int num)
  
   tclsetvar("tclstop", "0");
   prepare_netlist_structs(0);
-  if(!xctx->simdata.valid) create_simdata();
+  if(!xctx->simdata.inst) create_simdata();
   rebuild_selected_array();
   newval = value;
   if(!xctx->no_draw && !big) {

src/netlist.c

@@ -653,7 +653,7 @@ void prepare_netlist_structs(int for_netlist)
   else if (!for_netlist && xctx->prep_hi_structs) return;
   /* delete instance pins spatial hash, wires spatial hash, node_hash, wires and inst nodes.*/
   else delete_netlist_structs();
-  xctx->simdata.valid = 0;
+  free_simdata(); /* invalidate simulation cache */
   dbg(1, "prepare_netlist_structs(): extraction\n");
   if(xctx->netlist_count == 0 ) startlevel = xctx->currsch;
   print_erc =  xctx->netlist_count == 0 || startlevel < xctx->currsch;

src/xinit.c

@@ -408,7 +408,6 @@ void alloc_xschem_data()
   xctx->prep_hi_structs = 0;
   xctx->simdata.inst = NULL;
   xctx->simdata.ninst = 0;
-  xctx->simdata.valid = 0;
   xctx->prep_hash_inst = 0;
   xctx->prep_hash_wires = 0;
   xctx->modified = 0;

src/xschem.h

@@ -503,7 +503,6 @@ struct simdata_inst {
 struct simdata {
                  struct simdata_inst *inst;
                  int ninst;
-                 int valid;
                };
 
 typedef struct {