* src/mcs51/gen.c (genFunction): optimize RECEIVE in reentrant

[fw/sdcc] / src / mcs51 / ralloc.c

diff --git a/src/mcs51/ralloc.c b/src/mcs51/ralloc.c
index 88f13108d823b9f569591bb8f07927123fb3f252..b949106e1c56a2d2a779ceda7a1d32ee4504e12c 100644 (file)
--- a/src/mcs51/ralloc.c
+++ b/src/mcs51/ralloc.c
@@ -3033,6 +3033,14 @@ mcs51_assignRegisters (eBBlock ** ebbs, int count)
     redoStackOffsets ();
   }
 
+  /* make sure r0 & r1 are flagged as used if they might be used */
+  /* as pointers */
+  if (currFunc && mcs51_ptrRegReq)
+    {
+      currFunc->regsUsed = bitVectSetBit (currFunc->regsUsed, R0_IDX);
+      currFunc->regsUsed = bitVectSetBit (currFunc->regsUsed, R1_IDX);
+    }
+
   if (options.dump_rassgn)
     {
       dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);