tree-vect-data-refs.c (vect_transform_grouped_load): Limit shift permutations to…

tree-vect-data-refs.c (vect_transform_grouped_load): Limit shift permutations to loads group of size 3.

gcc/
	* tree-vect-data-refs.c (vect_transform_grouped_load): Limit shift
	permutations to loads group of size 3.

gcc/testsuite/

	* gcc.target/i386/pr52252-atom-1.c: Delete.

From-SVN: r218160

gcc/ChangeLog

+2014-11-28  Evgeny Stupachenko  <evstupac@gmail.com>
+
+	* tree-vect-data-refs.c (vect_transform_grouped_load): Limit shift
+	permutations to loads group of size 3.
+
 2014-11-28  Jiong Wang  <jiong.wang@arm.com>
 
 	* config/arm/arm.md (copysignsf3): New pattern.

gcc/testsuite/ChangeLog

+2014-11-28  Evgeny Stupachenko  <evstupac@gmail.com>
+
+	* gcc.target/i386/pr52252-atom-1.c: Delete.
+
 2014-11-28  Jiong Wang  <jiong.wang@arm.com>
 
 	* gcc.target/arm/copysign_softfloat_1.c: New copysign/copysignf

gcc/testsuite/gcc.target/i386/pr52252-atom-1.c

-/* { dg-do compile } */
-/* { dg-require-effective-target ssse3 } */
-/* { dg-options "-O2 -ftree-vectorize -mssse3 -mtune=slm" } */
-#define byte unsigned char
-
-void
-pair_mul_sum(byte *in, byte *out, int size)
-{
-  int j;
-  for(j = 0; j < size; j++)
-    {
-      byte a = in[0];
-      byte b = in[1];
-      byte c = in[2];
-      byte d = in[3];
-      out[0] = (byte)(a * b) + (byte)(b * c) + (byte)(c * d) + (byte)(d * a);
-      in += 4;
-      out += 1;
-    }
-}
-
-/* { dg-final { scan-assembler "perm2i128|palignr" } } */

gcc/tree-vect-data-refs.c

@@ -5617,6 +5617,7 @@ vect_transform_grouped_load (gimple stmt, vec<tree> dr_chain, int size,
      get chain for loads group using vect_shift_permute_load_chain.  */
   mode = TYPE_MODE (STMT_VINFO_VECTYPE (vinfo_for_stmt (stmt)));
   if (targetm.sched.reassociation_width (VEC_PERM_EXPR, mode) > 1
+      || exact_log2 (size) != -1
       || !vect_shift_permute_load_chain (dr_chain, size, stmt,
 					 gsi, &result_chain))
     vect_permute_load_chain (dr_chain, size, stmt, gsi, &result_chain);