re PR tree-optimization/49361 (Huge 470.lbm regression)

2011-06-10  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/49361
	* fold-const.c (fold_binary_loc): Only fold x * x to pow (x, 2.0)
	when not already in gimple form.

From-SVN: r174903

gcc/ChangeLog

 2011-06-10  Richard Guenther  <rguenther@suse.de>
 
+	PR tree-optimization/49361
+	* fold-const.c (fold_binary_loc): Only fold x * x to pow (x, 2.0)
+	when not already in gimple form.
+
+2011-06-10  Richard Guenther  <rguenther@suse.de>
+
 	PR bootstrap/49344
 	* tree-ssa-math-opts.c (convert_mult_to_fma): Use
 	FOR_EACH_PHI_OR_STMT_USE.

gcc/fold-const.c

@@ -10519,7 +10519,8 @@ fold_binary_loc (location_t loc,
 		}
 
 	      /* Optimize x*x as pow(x,2.0), which is expanded as x*x.  */
-	      if (optimize_function_for_speed_p (cfun)
+	      if (!in_gimple_form
+		  && optimize_function_for_speed_p (cfun)
 		  && operand_equal_p (arg0, arg1, 0))
 		{
 		  tree powfn = mathfn_built_in (type, BUILT_IN_POW);