X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2FSDCCopt.c;h=aea6e373f457f7cc6d4a1ce57d2f68fee469e244;hb=c34cf61917860a821a4631edda334443633805e7;hp=d9183695512c6b1eb5ffa5e856800ffff9db9fca;hpb=24db07e65dc37c465c586f173fcf7d591d5bd7bc;p=fw%2Fsdcc

diff --git a/src/SDCCopt.c b/src/SDCCopt.c
index d9183695..aea6e373 100644
--- a/src/SDCCopt.c
+++ b/src/SDCCopt.c
@@ -148,7 +148,8 @@ cnvToFcall (iCode * ic, eBBlock * ebp)
 	{
 	  newic = newiCode (IPUSH, right, NULL);
 	  newic->parmPush = 1;
-	  bytesPushed+=4;
+	  //bytesPushed+=4;
+	  bytesPushed += getSize(operandType(right));
 	}
 
       addiCodeToeBBlock (ebp, newic, ip);
@@ -164,7 +165,8 @@ cnvToFcall (iCode * ic, eBBlock * ebp)
 	{
 	  newic = newiCode (IPUSH, left, NULL);
 	  newic->parmPush = 1;
-	  bytesPushed+=4;
+	  //bytesPushed+=4;
+	  bytesPushed += getSize(operandType(left));
 	}
       addiCodeToeBBlock (ebp, newic, ip);
       newic->lineno = lineno;
@@ -188,6 +190,7 @@ cnvToFloatCast (iCode * ic, eBBlock * ebp)
   sym_link *type = operandType (IC_RIGHT (ic));
   int linenno = ic->lineno;
   int bwd, su;
+  int bytesPushed=0;
 
   ip = ic->next;
   /* remove it from the iCode */
@@ -236,6 +239,7 @@ found:
 	{
 	  newic = newiCode (IPUSH, IC_RIGHT (ic), NULL);
 	  newic->parmPush = 1;
+	  bytesPushed += getSize(operandType(IC_RIGHT(ic)));
 	}
       addiCodeToeBBlock (ebp, newic, ip);
       newic->lineno = linenno;
@@ -245,6 +249,7 @@ found:
   /* make the call */
   newic = newiCode (CALL, operandFromSymbol (func), NULL);
   IC_RESULT (newic) = IC_RESULT (ic);
+  newic->parmBytes+=bytesPushed;
   addiCodeToeBBlock (ebp, newic, ip);
   newic->lineno = linenno;
 
@@ -261,6 +266,7 @@ cnvFromFloatCast (iCode * ic, eBBlock * ebp)
   sym_link *type = operandType (IC_LEFT (ic));
   int lineno = ic->lineno;
   int bwd, su;
+  int bytesPushed=0;
 
   ip = ic->next;
   /* remove it from the iCode */
@@ -310,6 +316,7 @@ found:
 	{
 	  newic = newiCode (IPUSH, IC_RIGHT (ic), NULL);
 	  newic->parmPush = 1;
+	  bytesPushed += getSize(operandType(IC_RIGHT(ic)));
 	}
       addiCodeToeBBlock (ebp, newic, ip);
       newic->lineno = lineno;
@@ -319,11 +326,14 @@ found:
   /* make the call */
   newic = newiCode (CALL, operandFromSymbol (func), NULL);
   IC_RESULT (newic) = IC_RESULT (ic);
+  newic->parmBytes+=bytesPushed;
   addiCodeToeBBlock (ebp, newic, ip);
   newic->lineno = lineno;
 
 }
 
+extern operand *geniCodeRValue (operand *, bool);
+
 /*-----------------------------------------------------------------*/
 /* convilong - converts int or long mults or divs to fcalls        */
 /*-----------------------------------------------------------------*/
@@ -338,8 +348,34 @@ convilong (iCode * ic, eBBlock * ebp, sym_link * type, int op)
   int su;
   int bytesPushed=0;
 
-  remiCodeFromeBBlock (ebp, ic);
-
+  // Easy special case which avoids function call: modulo by a literal power 
+  // of two can be replaced by a bitwise AND.
+  if (op == '%' && isOperandLiteral(IC_RIGHT(ic)))
+  {
+      unsigned litVal = (unsigned)(operandLitValue(IC_RIGHT(ic)));
+      
+      // See if literal value is a power of 2.
+      while (litVal && !(litVal & 1))
+      {
+	  litVal >>= 1;
+      }
+      if (litVal)
+      {
+	  // discard first high bit set.
+	  litVal >>= 1;
+      }
+	  
+      if (!litVal)
+      {
+	  ic->op = BITWISEAND;
+	  IC_RIGHT(ic) = operandFromLit(operandLitValue(IC_RIGHT(ic)) - 1);
+	  return;
+      }
+  }
+    
+  remiCodeFromeBBlock (ebp, ic);    
+    
+    
   /* depending on the type */
   for (bwd = 0; bwd < 3; bwd++)
     {
@@ -643,7 +679,10 @@ killDeadCode (eBBlock ** ebbs, int count)
 
 	      if (SKIP_IC (ic) ||
 		  ic->op == IFX ||
-		  ic->op == RETURN)
+		  ic->op == RETURN ||
+                  ic->op == DUMMY_READ_VOLATILE ||
+                  ic->op == CRITICAL ||
+                  ic->op == ENDCRITICAL)
 		continue;
 
 	      /* if the result is volatile then continue */
@@ -653,6 +692,9 @@ killDeadCode (eBBlock ** ebbs, int count)
 	      /* if the result is a temp & isaddr then skip */
 	      if (IC_RESULT (ic) && POINTER_SET (ic))
 		continue;
+              
+              if (POINTER_GET (ic) && IS_VOLATILE (operandType (IC_LEFT (ic))->next))
+                continue;
 
 	      /* if the result is used in the remainder of the */
 	      /* block then skip */
@@ -689,7 +731,7 @@ killDeadCode (eBBlock ** ebbs, int count)
 		    continue;
 
 		  kill = 1;
-		}
+                }
 
 	    kill:
 	      /* kill this one if required */
@@ -830,7 +872,7 @@ eBBlockFromiCode (iCode * ic)
     dumpEbbsToFileExt (DUMP_RAW1, ebbs, count);
 
   /* do common subexpression elimination for each block */
-  change = cseAllBlocks (ebbs, saveCount);
+  change = cseAllBlocks (ebbs, saveCount, FALSE);
 
   /* dumpraw if asked for */
   if (options.dump_raw)
@@ -846,10 +888,15 @@ eBBlockFromiCode (iCode * ic)
   /* global common subexpression elimination  */
   if (optimize.global_cse)
     {
-      change += cseAllBlocks (ebbs, saveCount);
+      change += cseAllBlocks (ebbs, saveCount, FALSE);
       if (options.dump_gcse)
 	dumpEbbsToFileExt (DUMP_GCSE, ebbs, saveCount);
     }
+  else
+    {
+      // compute the dataflow only
+      assert(cseAllBlocks (ebbs, saveCount, TRUE)==0);
+    }
   /* kill dead code */
   kchange = killDeadCode (ebbs, saveCount);
 
@@ -871,7 +918,7 @@ eBBlockFromiCode (iCode * ic)
   if (lchange || kchange)
     {
       computeDataFlow (ebbs, saveCount);
-      change += cseAllBlocks (ebbs, saveCount);
+      change += cseAllBlocks (ebbs, saveCount, FALSE);
       if (options.dump_loop)
 	dumpEbbsToFileExt (DUMP_LOOPG, ebbs, count);
 
@@ -889,6 +936,25 @@ eBBlockFromiCode (iCode * ic)
   /* sort it back by block number */
   qsort (ebbs, saveCount, sizeof (eBBlock *), bbNumCompare);
 
+  if (!options.lessPedantic) {
+    // this is a good place to check missing return values
+    if (currFunc) {
+      // the user is on his own with naked functions...
+      if (!IS_VOID(currFunc->etype)
+       && !FUNC_ISNAKED(currFunc->type)) {
+	eBBlock *bp;
+	// make sure all predecessors of the last block end in a return
+	for (bp=setFirstItem(ebbs[saveCount-1]->predList); 
+	     bp; 
+	     bp=setNextItem(ebbs[saveCount-1]->predList)) {
+	  if (bp->ech->op != RETURN) {
+	    werror (W_VOID_FUNC, currFunc->name);
+	  }
+	}
+      }
+    }
+  }
+
   /* if cyclomatic info requested then print it */
   if (options.cyclomatic)
     printCyclomatic (ebbs, saveCount);
@@ -914,9 +980,9 @@ eBBlockFromiCode (iCode * ic)
   port->assignRegisters (ebbs, count);
 
   /* throw away blocks */
-  setToNull ((void **) &graphEdges);
+  setToNull ((void *) &graphEdges);
   ebbs = NULL;
-
+  
   return NULL;
 }