From: ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 5 Mar 2007 18:01:00 +0000 (+0000)
Subject: 	PR tree-optimization/31034
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=c08d658d13abc2e929643a24a1cd472d701759ef;p=thirdparty%2Fgcc.git

	PR tree-optimization/31034
	* tree-vrp.c (extract_range_from_assert): Don't try to handle a
	half-range if the other side is an overflow infinity.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@122562 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3c2a92e7d9dd..a1a5e3cd41cb 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2007-03-05  Ian Lance Taylor  <iant@google.com>
+
+	PR tree-optimization/31034
+	* tree-vrp.c (extract_range_from_assert): Don't try to handle a
+	half-range if the other side is an overflow infinity.
+
 2007-03-05  Bernd Schmidt  <bernd.schmidt@analog.com>
 
 	* config.gcc (bfin*-uclinux*): Use t-bfin-uclinux.
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c
index d3785a427e1e..fd5ba643db09 100644
--- a/gcc/tree-vrp.c
+++ b/gcc/tree-vrp.c
@@ -1137,13 +1137,14 @@ extract_range_from_assert (value_range_t *vr_p, tree expr)
       /* If the maximum value forces us to be out of bounds, simply punt.
 	 It would be pointless to try and do anything more since this
 	 all should be optimized away above us.  */
-      if (cond_code == LT_EXPR && compare_values (max, min) == 0)
+      if ((cond_code == LT_EXPR
+	   && compare_values (max, min) == 0)
+	  || is_overflow_infinity (max))
 	set_value_range_to_varying (vr_p);
       else
 	{
 	  /* For LT_EXPR, we create the range [MIN, MAX - 1].  */
-	  if (cond_code == LT_EXPR
-	      && !is_positive_overflow_infinity (max))
+	  if (cond_code == LT_EXPR)
 	    {
 	      tree one = build_int_cst (type, 1);
 	      max = fold_build2 (MINUS_EXPR, type, max, one);
@@ -1169,13 +1170,14 @@ extract_range_from_assert (value_range_t *vr_p, tree expr)
       /* If the minimum value forces us to be out of bounds, simply punt.
 	 It would be pointless to try and do anything more since this
 	 all should be optimized away above us.  */
-      if (cond_code == GT_EXPR && compare_values (min, max) == 0)
+      if ((cond_code == GT_EXPR
+	   && compare_values (min, max) == 0)
+	  || is_overflow_infinity (min))
 	set_value_range_to_varying (vr_p);
       else
 	{
 	  /* For GT_EXPR, we create the range [MIN + 1, MAX].  */
-	  if (cond_code == GT_EXPR
-	      && !is_negative_overflow_infinity (min))
+	  if (cond_code == GT_EXPR)
 	    {
 	      tree one = build_int_cst (type, 1);
 	      min = fold_build2 (PLUS_EXPR, type, min, one);