re PR middle-end/61927 (Wrong results with loop vectorization of: "var[i] =…

re PR middle-end/61927 (Wrong results with loop vectorization of: "var[i] = ABS_EXPR<var2[i]>  > 9.9e-7")

2014-11-25  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/61927
	* tree-vect-loop.c (vect_analyze_loop_2): Revert ordering
	of group and pattern analysis to the one in GCC 4.8.

From-SVN: r218046

gcc/ChangeLog

+2014-11-25  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/61927
+	* tree-vect-loop.c (vect_analyze_loop_2): Revert ordering
+	of group and pattern analysis to the one in GCC 4.8.
+
 2014-11-25  Ilya Tocar  <ilya.tocar@intel.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/tree-vect-loop.c

@@ -1662,6 +1662,13 @@ vect_analyze_loop_2 (loop_vec_info loop_vinfo)
       return false;
     }
 
+  /* Classify all cross-iteration scalar data-flow cycles.
+     Cross-iteration cycles caused by virtual phis are analyzed separately.  */
+
+  vect_analyze_scalar_cycles (loop_vinfo);
+
+  vect_pattern_recog (loop_vinfo, NULL);
+
   /* Analyze the access patterns of the data-refs in the loop (consecutive,
      complex, etc.). FORNOW: Only handle consecutive access pattern.  */
 
@@ -1674,13 +1681,6 @@ vect_analyze_loop_2 (loop_vec_info loop_vinfo)
       return false;
     }
 
-  /* Classify all cross-iteration scalar data-flow cycles.
-     Cross-iteration cycles caused by virtual phis are analyzed separately.  */
-
-  vect_analyze_scalar_cycles (loop_vinfo);
-
-  vect_pattern_recog (loop_vinfo, NULL);
-
   /* Data-flow analysis to detect stmts that do not need to be vectorized.  */
 
   ok = vect_mark_stmts_to_be_vectorized (loop_vinfo);