tree-vect-generic.c (lower_vec_perm): Propagate vector constants into VEC_PERM_EXPR.

2012-06-15  Ramana Radhakrishnan  <ramana.radhakrishnan@linaro.org>

	* tree-vect-generic.c (lower_vec_perm): Propagate vector constants
	into VEC_PERM_EXPR.

From-SVN: r188659

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d4174c2397fbc01b6549d55a42048006da3bc378..5ce784a4c0e12eed31a520d2cda4de369bb8b713 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2012-06-15  Ramana Radhakrishnan  <ramana.radhakrishnan@linaro.org>
+
+       * tree-vect-generic.c (lower_vec_perm): Propagate vector constants
+       into VEC_PERM_EXPR.
+
 2012-06-15  Jakub Jelinek  <jakub@redhat.com>
 
        * tree-vect-patterns.c (vect_pattern_recog): Don't unnecessarily

diff --git a/gcc/tree-vect-generic.c b/gcc/tree-vect-generic.c
index 06334bb8fd1406d69388d91726b56b63cf4bd4d2..3b9f561bbfbf53ce9aa878b17dfe8899e4106d6e 100644 (file)
--- a/gcc/tree-vect-generic.c
+++ b/gcc/tree-vect-generic.c
@@ -628,6 +628,14 @@ lower_vec_perm (gimple_stmt_iterator *gsi)
   location_t loc = gimple_location (gsi_stmt (*gsi));
   unsigned i;
 
+  if (TREE_CODE (mask) == SSA_NAME)
+    {
+      gimple def_stmt = SSA_NAME_DEF_STMT (mask);
+      if (is_gimple_assign (def_stmt)
+         && gimple_assign_rhs_code (def_stmt) == VECTOR_CST)
+       mask = gimple_assign_rhs1 (def_stmt);
+    }
+
   if (TREE_CODE (mask) == VECTOR_CST)
     {
       unsigned char *sel_int = XALLOCAVEC (unsigned char, elements);
@@ -637,7 +645,11 @@ lower_vec_perm (gimple_stmt_iterator *gsi)
                      & (2 * elements - 1));
 
       if (can_vec_perm_p (TYPE_MODE (vect_type), false, sel_int))
-       return;
+       {
+         gimple_assign_set_rhs3 (stmt, mask);
+         update_stmt (stmt);
+         return;
+       }
     }
   else if (can_vec_perm_p (TYPE_MODE (vect_type), true, NULL))
     return;