X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Ftree-chrec.c;h=26ae9b408a70a2f9c51f5fe8d15419ea658efa17;hb=bf3e1520c00cff0abcd998aac1c85f084f162d3e;hp=89e96fd53b68aa17b6c9a1fce050997e95ea3f9b;hpb=75a70cf95f65fe9204b15ad9aba31c571381d224;p=pf3gnuchains%2Fgcc-fork.git

diff --git a/gcc/tree-chrec.c b/gcc/tree-chrec.c
index 89e96fd53b6..26ae9b408a7 100644
--- a/gcc/tree-chrec.c
+++ b/gcc/tree-chrec.c
@@ -579,8 +579,7 @@ chrec_apply (unsigned var,
       /* "{a, +, b} (x)"  ->  "a + b*x".  */
       x = chrec_convert_rhs (type, x, NULL);
       res = chrec_fold_multiply (TREE_TYPE (x), CHREC_RIGHT (chrec), x);
-      if (!integer_zerop (CHREC_LEFT (chrec)))
-	res = chrec_fold_plus (type, CHREC_LEFT (chrec), res);
+      res = chrec_fold_plus (type, CHREC_LEFT (chrec), res);
     }
   
   else if (TREE_CODE (chrec) != POLYNOMIAL_CHREC)
@@ -1408,3 +1407,26 @@ scev_direction (const_tree chrec)
   else
     return EV_DIR_GROWS;
 }
+
+/* Iterates over all the components of SCEV, and calls CBCK.  */
+
+void
+for_each_scev_op (tree *scev, bool (*cbck) (tree *, void *), void *data)
+{
+  switch (TREE_CODE_LENGTH (TREE_CODE (*scev)))
+    {
+    case 3:
+      for_each_scev_op (&TREE_OPERAND (*scev, 2), cbck, data);
+
+    case 2:
+      for_each_scev_op (&TREE_OPERAND (*scev, 1), cbck, data);
+      
+    case 1:
+      for_each_scev_op (&TREE_OPERAND (*scev, 0), cbck, data);
+
+    default:
+      cbck (scev, data);
+      break;
+    }
+}
+