From 9adc1e115a66d97399e92f57a9298cdfbe68564a Mon Sep 17 00:00:00 2001
From: sandeep <sandeep@4a8a32a2-be11-0410-ad9d-d568d2c75423>
Date: Wed, 21 Nov 2001 17:11:55 +0000
Subject: [PATCH] functions containing only __builtin functions can overlay
 variables

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@1628 4a8a32a2-be11-0410-ad9d-d568d2c75423
---
 src/SDCCmem.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/SDCCmem.c b/src/SDCCmem.c
index 613de3e2..4eeca0f5 100644
--- a/src/SDCCmem.c
+++ b/src/SDCCmem.c
@@ -1016,8 +1016,13 @@ canOverlayLocals (eBBlock ** ebbs, int count)
       iCode *ic;
 
       for (ic = ebbs[i]->sch; ic; ic = ic->next)
-	if (ic && (ic->op == CALL || ic->op == PCALL))
-	  return FALSE;
+	  if (ic) {
+	      if (ic->op == CALL) {
+		  sym_link *ftype = operandType(IC_LEFT(ic));
+		  /* builtins only can use overlays */
+		  if (!IFFUNC_ISBUILTIN(ftype)) return FALSE; 
+	      } else if (ic->op == PCALL) return FALSE;
+	  }
     }
 
   /* no function calls found return TRUE */
-- 
2.39.5