2009-08-19 Sterling Augustine <sterling@tensilica.com>

	* config/tc-xtensa.h (xtensa_frag_data): Rename unused field fr_prev
	to no_transform_end.
	* config/tc-xtensa.c (xtensa_mark_difference_of_two_symbols): Set
	and use no_transform_end.

2 files changed, 15 insertions, 6 deletions

diff --git a/gas/config/tc-xtensa.c b/gas/config/tc-xtensa.c
index caea25c..645af97 100644
--- a/gas/config/tc-xtensa.c
+++ b/gas/config/tc-xtensa.c
@@ -7460,6 +7460,7 @@ xtensa_mark_difference_of_two_symbols (void)
 	    {
 	      fragS *start;
 	      fragS *end;
+	      fragS *walk;
 
 	      if (symbol_get_frag (left)->fr_address 
 		  <= symbol_get_frag (right)->fr_address)
@@ -7472,12 +7473,19 @@ xtensa_mark_difference_of_two_symbols (void)
 		  start = symbol_get_frag (right);
 		  end = symbol_get_frag (left);
 		}
+
+	      if (start->tc_frag_data.no_transform_end != NULL)
+		walk = start->tc_frag_data.no_transform_end;
+	      else
+		walk = start;
 	      do 
 		{
-		  start->tc_frag_data.is_no_transform = 1;
-		  start = start->fr_next;
+		  walk->tc_frag_data.is_no_transform = 1;
+		  walk = walk->fr_next;
 		}
-	      while (start && start->fr_address < end->fr_address);
+	      while (walk && walk->fr_address < end->fr_address);
+
+	      start->tc_frag_data.no_transform_end = walk;
 	    }
 	}
     }
diff --git a/gas/config/tc-xtensa.h b/gas/config/tc-xtensa.h
index 91607af..ba613e4 100644
--- a/gas/config/tc-xtensa.h
+++ b/gas/config/tc-xtensa.h
@@ -263,9 +263,10 @@ struct xtensa_frag_type
   symbolS *slot_symbols[MAX_SLOTS];
   offsetT slot_offsets[MAX_SLOTS];
 
-  /* The global aligner needs to walk backward through the list of
-     frags.  This field is only valid after xtensa_end.  */
-  fragS *fr_prev;
+  /* When marking frags after this one in the chain as no transform,
+     cache the last one in the chain, so that we can skip to the
+     end of the chain.  */
+  fragS *no_transform_end;
 };