* sim/ucsim/z80.src/inst.cc: #include <stdarg.h> for gcc 3.2

[fw/sdcc] / src / SDCClrange.c

diff --git a/src/SDCClrange.c b/src/SDCClrange.c
index 376d3caae4b7677bfc1878b375f746c8efe76777..6c77fd3a42dc8671b396887b098ce803fd5ac555 100644 (file)
--- a/src/SDCClrange.c
+++ b/src/SDCClrange.c
@@ -280,7 +280,9 @@ useDefLoopCheck (operand * op, iCode * ic)
                  OP_SYMBOL (op)->name,
                  ic->filename, ic->lineno);
        }
+#if 0 // this will create a segfault: bug #498971
       OP_SYMBOL (op)->isspilt = 1;
+#endif
     }
 }
 
@@ -656,6 +658,44 @@ static void computeClash ()
     }
 }
 
+/*-----------------------------------------------------------------*/
+/* allDefsOutOfRange - all definitions are out of a range          */
+/*-----------------------------------------------------------------*/
+bool
+allDefsOutOfRange (bitVect * defs, int fseq, int toseq)
+{
+  int i;
+
+  if (!defs)
+    return TRUE;
+
+  for (i = 0; i < defs->size; i++)
+    {
+      iCode *ic;
+
+      if (bitVectBitValue (defs, i) &&
+         (ic = hTabItemWithKey (iCodehTab, i)) &&
+         (ic->seq >= fseq && ic->seq <= toseq))
+
+       return FALSE;
+
+    }
+
+  return TRUE;
+}
+
+/*-----------------------------------------------------------------*/
+/* notUsedInBlock - not used in this block                         */
+/*-----------------------------------------------------------------*/
+int
+notUsedInBlock (symbol * sym, eBBlock * ebp, iCode *ic)
+{
+  return (!bitVectBitsInCommon (sym->defs, ebp->usesDefs) &&
+         allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq) &&
+         allDefsOutOfRange (sym->uses, ebp->fSeq, ebp->lSeq));
+}
+
+
 /*-----------------------------------------------------------------*/
 /* computeLiveRanges - computes the live ranges for variables      */
 /*-----------------------------------------------------------------*/
@@ -685,3 +725,4 @@ computeLiveRanges (eBBlock ** ebbs, int count)
   /* compute which overlaps with what */
   computeClash();
 }
+