re PR tree-optimization/48734 (ICE in eliminate_redundant_comparison, at tree-ssa-reassoc.c:1321)

	PR tree-optimization/48734
	* tree-ssa-reassoc.c (eliminate_redundant_comparison): Give up
	if return value from maybe_fold_*_comparsions isn't something
	the code is prepared to handle.

	* gcc.c-torture/compile/pr48734.c: New test.

From-SVN: r172967

gcc/ChangeLog

+2011-04-26  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/48734
+	* tree-ssa-reassoc.c (eliminate_redundant_comparison): Give up
+	if return value from maybe_fold_*_comparsions isn't something
+	the code is prepared to handle.
+
 2011-04-26  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/predicates.md (ext_QIreg_operand): Remove extra

gcc/testsuite/ChangeLog

 2011-04-26  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/48734
+	* gcc.c-torture/compile/pr48734.c: New test.
+
 	PR testsuite/48753
 	* gcc.dg/tree-prof/val-prof-2.c: Adjust for 32-bit HWI.
 

gcc/testsuite/gcc.c-torture/compile/pr48734.c

+/* PR tree-optimization/48734 */
+
+unsigned int
+foo (int x, unsigned int y, unsigned int z)
+{
+  z &= (x == -__INT_MAX__ - 1 ? x : -x) > y;
+  z &= (x == -__INT_MAX__ - 1 ? x : -x) > y;
+  z &= (x == -__INT_MAX__ - 1 ? x : -x) > y;
+  z &= (x == -__INT_MAX__ - 1 ? x : -x) > y;
+  return z;
+}

gcc/tree-ssa-reassoc.c

 /* Reassociation for trees.
-   Copyright (C) 2005, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+   Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011
+   Free Software Foundation, Inc.
    Contributed by Daniel Berlin <dan@dberlin.org>
 
 This file is part of GCC.
@@ -1279,6 +1280,20 @@ eliminate_redundant_comparison (enum tree_code opcode,
       if (!useless_type_conversion_p (TREE_TYPE (curr->op), TREE_TYPE (t)))
 	t = fold_convert (TREE_TYPE (curr->op), t);
 
+      if (TREE_CODE (t) != INTEGER_CST
+	  && !operand_equal_p (t, curr->op, 0))
+	{
+	  enum tree_code subcode;
+	  tree newop1, newop2;
+	  if (!COMPARISON_CLASS_P (t))
+	    continue;
+	  extract_ops_from_tree (t, &subcode, &newop1, &newop2);
+	  STRIP_USELESS_TYPE_CONVERSION (newop1);
+	  STRIP_USELESS_TYPE_CONVERSION (newop2);
+	  if (!is_gimple_val (newop1) || !is_gimple_val (newop2))
+	    continue;
+	}
+
       if (dump_file && (dump_flags & TDF_DETAILS))
 	{
 	  fprintf (dump_file, "Equivalence: ");