From 155a821372f0f6533eb7e6f711bb221ce5bc136b Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@redhat.com>
Date: Sun, 2 Jan 2005 00:35:34 -0800
Subject: tree-vectorizer.c (vect_analyze_offset_expr): Strip conversions that
 don't narrow the value.

        * tree-vectorizer.c (vect_analyze_offset_expr): Strip conversions
        that don't narrow the value.  Fail for other conversions.

From-SVN: r92804
---
 gcc/tree-vectorizer.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'gcc/tree-vectorizer.c')

diff --git a/gcc/tree-vectorizer.c b/gcc/tree-vectorizer.c
index 5df56df..bd826d0 100644
--- a/gcc/tree-vectorizer.c
+++ b/gcc/tree-vectorizer.c
@@ -1390,7 +1390,22 @@ vect_analyze_offset_expr (tree expr,
   enum tree_code code;
   tree init, evolution, def_stmt;
 
-  STRIP_NOPS (expr);
+  /* Strip conversions that don't narrow the mode.  */
+  while (TREE_CODE (expr) == NOP_EXPR || TREE_CODE (expr) == CONVERT_EXPR)
+    {
+      tree to, ti;
+
+      to = TREE_TYPE (expr);
+      oprnd0 = TREE_OPERAND (expr, 0);
+      ti = TREE_TYPE (oprnd0);
+
+      if (!INTEGRAL_TYPE_P (to) || !INTEGRAL_TYPE_P (ti))
+	return false;
+      if (GET_MODE_SIZE (TYPE_MODE (to)) < GET_MODE_SIZE (TYPE_MODE (ti)))
+	return false;
+
+      expr = oprnd0;
+    }
   
   *step = NULL_TREE;
   *misalign = NULL_TREE;
-- 
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