[PATCH GCC8][11/33]New interfaces for tree affine

[Bin Cheng]

Hi,
This patch adds three simple interfaces for tree affine which will be used in
cost computation later.

Is it OK?

Thanks,
bin
2017-04-11  Bin Cheng  <bin.ch...@arm.com>

        * tree-affine.h (aff_combination_type): New interface.
        (aff_combination_const_p, aff_combination_simple_p): New interfaces.
From 1646cba4cc5576919d6bbaf8bcc99b5ca9b4210a Mon Sep 17 00:00:00 2001
From: Bin Cheng <binch...@e108451-lin.cambridge.arm.com>
Date: Wed, 1 Mar 2017 11:55:17 +0000
Subject: [PATCH 11/33] add-tree-affine-interfaces-20170221.txt

---
 gcc/tree-affine.h | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/gcc/tree-affine.h b/gcc/tree-affine.h
index b8eb8cc..557e363 100644
--- a/gcc/tree-affine.h
+++ b/gcc/tree-affine.h
@@ -88,6 +88,12 @@ bool aff_comb_cannot_overlap_p (aff_tree *, const widest_int 
&,
 /* Debugging functions.  */
 void debug_aff (aff_tree *);
 
+static inline tree
+aff_combination_type (aff_tree *aff)
+{
+  return aff->type;
+}
+
 /* Return true if AFF is actually ZERO.  */
 static inline bool
 aff_combination_zero_p (aff_tree *aff)
@@ -101,4 +107,35 @@ aff_combination_zero_p (aff_tree *aff)
   return false;
 }
 
+/* Return true if AFF is actually const.  */
+static inline bool
+aff_combination_const_p (aff_tree *aff)
+{
+  if (!aff)
+    return true;
+
+  if (aff->n == 0)
+    return true;
+
+  return false;
+}
+
+/* Return true if AFF is simple enough.  */
+static inline bool
+aff_combination_simple_p (aff_tree *aff)
+{
+  if (!aff || aff->n == 0)
+    return true;
+
+  if (aff->n > 1)
+    return false;
+
+  if (aff->offset != 0)
+    return false;
+
+  if (aff->elts[0].coef != 1 && aff->elts[0].coef != -1)
+    return false;
+
+  return true;
+}
 #endif /* GCC_TREE_AFFINE_H */
-- 
1.9.1