prelimanary fix for bug #480076

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@1610 4a8a32a2-be11-0410-ad9d-d568d2c75423

diff --git a/src/mcs51/ralloc.c b/src/mcs51/ralloc.c
index 5d6792266483a51ad383fbf6c9e91c6ee1cf1a9c..0eb8a3b81a8d3c0e95e3ee1b87ec60eee050ef85 100644 (file)
--- a/src/mcs51/ralloc.c
+++ b/src/mcs51/ralloc.c
@@ -1400,7 +1400,7 @@ rematStr (symbol * sym)
 /* regTypeNum - computes the type & number of registers required   */
 /*-----------------------------------------------------------------*/
 static void
-regTypeNum ()
+regTypeNum (eBBlock *ebbs)
 {
   symbol *sym;
   int k;
@@ -1452,7 +1452,6 @@ regTypeNum ()
                  !IS_CAST_ICODE(OP_SYMBOL (IC_LEFT (ic))->rematiCode) &&
                  DCL_TYPE (aggrToPtr (sym->type, FALSE)) == POINTER)
                {
-
                  /* create a psuedo symbol & force a spil */
                  symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
                  psym->type = sym->type;
@@ -1460,6 +1459,16 @@ regTypeNum ()
                  strcpy (psym->rname, psym->name);
                  sym->isspilt = 1;
                  sym->usl.spillLoc = psym;
+#if 0 // an alternative fix for bug #480076
+                 /* now this is a useless assignment to itself */
+                 remiCodeFromeBBlock (ebbs, ic);
+#else
+                 /* now this really is an assignment to itself, make it so;
+                    it will be optimized out later */
+                 ic->op='=';
+                 IC_RIGHT(ic)=IC_RESULT(ic);
+                 IC_LEFT(ic)=NULL;
+#endif
                  continue;
                }
 
@@ -2527,7 +2536,7 @@ mcs51_assignRegisters (eBBlock ** ebbs, int count)
 
   /* first determine for each live range the number of 
      registers & the type of registers required for each */
-  regTypeNum ();
+  regTypeNum (*ebbs);
 
   /* and serially allocate registers */
   serialRegAssign (ebbs, count);