[AArch64] Reverse TBL indices for big-endian.

2014-04-24  Tejas Belagod  <tejas.belagod@arm.com>

       * config/aarch64/aarch64.c (aarch64_evpc_tbl): Reverse order of elements
       for big-endian.

From-SVN: r209742

gcc/ChangeLog

+2014-04-24  Tejas Belagod  <tejas.belagod@arm.com>
+
+	* config/aarch64/aarch64.c (aarch64_evpc_tbl): Reverse order of elements
+	for big-endian.
+
 2014-04-24  Richard Biener  <rguenther@suse.de>
 
 	* expr.c (expand_expr_real_1): Avoid gimple_assign_rhs_to_tree

gcc/config/aarch64/aarch64.c

@@ -8158,7 +8158,15 @@ aarch64_evpc_tbl (struct expand_vec_perm_d *d)
     return false;
 
   for (i = 0; i < nelt; ++i)
-    rperm[i] = GEN_INT (d->perm[i]);
+    {
+      int nunits = GET_MODE_NUNITS (vmode);
+
+      /* If big-endian and two vectors we end up with a weird mixed-endian
+	 mode on NEON.  Reverse the index within each word but not the word
+	 itself.  */
+      rperm[i] = GEN_INT (BYTES_BIG_ENDIAN ? d->perm[i] ^ (nunits - 1)
+					   : d->perm[i]);
+    }
   sel = gen_rtx_CONST_VECTOR (vmode, gen_rtvec_v (nelt, rperm));
   sel = force_reg (vmode, sel);