re PR tree-optimization/66002 (paq8p benchmark 50% slower than clang on sandybridge)

2015-05-07  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/66002
	* passes.def: Schedule another pass_merge_phi after ifcombine, right
	before phiopt.

	* gcc.dg/vect/vect-125.c: New testcase.

From-SVN: r222873

gcc/ChangeLog

+2015-05-07  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/66002
+	* passes.def: Schedule another pass_merge_phi after ifcombine, right
+	before phiopt.
+
 2015-05-07  Marek Polacek  <polacek@redhat.com>
 	    Martin Uecker  <uecker@eecs.berkeley.edu>
 

gcc/passes.def

@@ -177,6 +177,7 @@ along with GCC; see the file COPYING3.  If not see
       NEXT_PASS (pass_cselim);
       NEXT_PASS (pass_copy_prop);
       NEXT_PASS (pass_tree_ifcombine);
+      NEXT_PASS (pass_merge_phi);
       NEXT_PASS (pass_phiopt);
       NEXT_PASS (pass_tail_recursion);
       NEXT_PASS (pass_ch);

gcc/testsuite/ChangeLog

+2015-05-07  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/66002
+	* gcc.dg/vect/vect-125.c: New testcase.
+
 2015-05-07  Marek Polacek  <polacek@redhat.com>
 	    Martin Uecker  <uecker@eecs.berkeley.edu>
 

gcc/testsuite/gcc.dg/vect/vect-125.c

+/* { dg-do compile } */
+/* { dg-require-effective-target vect_int } */
+/* { dg-require-effective-target vect_int_mult } */
+/* { dg-require-effective-target vect_pack_trunc } */
+/* { dg-require-effective-target vect_unpack } */
+
+void train(short *t, short *w, int n, int err)
+{
+  n=(n+7)&-8;
+  for (int i=0; i<n; ++i)
+    {
+      int wt=w[i]+((t[i]*err*2>>16)+1>>1);
+      if (wt<-32768) wt=-32768;
+      if (wt>32767) wt=32767;
+      w[i]=wt;
+    }
+}
+
+/* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" { xfail vect_no_int_max } } } */
+/* { dg-final { cleanup-tree-dump "vect" } } */