* src/SDCCast.h,

[fw/sdcc] / src / SDCCopt.c

diff --git a/src/SDCCopt.c b/src/SDCCopt.c
index 1ac5b7f94cf7c928e6236603990bd14e13a30cef..a4c7de2261b6a42e56537c9821350e8ce2ef8f14 100644 (file)
--- a/src/SDCCopt.c
+++ b/src/SDCCopt.c
@@ -824,6 +824,18 @@ killDeadCode (eBBlock ** ebbs, int count)
                  bool volRight = IS_SYMOP (IC_RIGHT (ic)) 
                                  && isOperandVolatile (IC_RIGHT (ic), FALSE);
 
+                 
+                 if (ic->next && ic->seqPoint == ic->next->seqPoint
+                     && (ic->next->op == '+' || ic->next->op == '-'))
+                   {
+                     if (isOperandEqual (IC_LEFT(ic), IC_LEFT(ic->next))
+                         || isOperandEqual (IC_LEFT(ic), IC_RIGHT(ic->next)))
+                       volLeft = FALSE;
+                     if (isOperandEqual (IC_RIGHT(ic), IC_LEFT(ic->next))
+                         || isOperandEqual (IC_RIGHT(ic), IC_RIGHT(ic->next)))
+                       volRight = FALSE;
+                   }
+                 
                  change = 1;
                  gchange++;