re PR target/51387 (Test vect.exp/vect-116.c fails on execution when compiled with -mavx2 on sde.)

	PR target/51387
	* config/i386/sse.md (mul<mode>3 with VI1_AVX2 iterator): For
	V32QImode use { 0,2,..,14,32,34,..,46,16,18,..,30,48,50,..,62 }
	permutation instead of extract even permutation.

From-SVN: r181951

gcc/ChangeLog

+2011-12-02  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/51387
+	* config/i386/sse.md (mul<mode>3 with VI1_AVX2 iterator): For
+	V32QImode use { 0,2,..,14,32,34,..,46,16,18,..,30,48,50,..,62 }
+	permutation instead of extract even permutation.
+
 2011-12-02  Nathan Sidwell  <nathan@acm.org>
 
 	* gcov.c (struct arc_info): Add is_throw field.

gcc/config/i386/sse.md

@@ -5066,7 +5066,24 @@
 					gen_lowpart (mulmode, t[3]))));
 
   /* Extract the even bytes and merge them back together.  */
+  if (<MODE>mode == V16QImode)
     ix86_expand_vec_extract_even_odd (operands[0], t[5], t[4], 0);
+  else
+    {
+      /* Since avx2_interleave_{low,high}v32qi used above aren't cross-lane,
+	 this can't be normal even extraction, but one where additionally
+	 the second and third quarter are swapped.  That is even one insn
+	 shorter than even extraction.  */
+      rtvec v = rtvec_alloc (32);
+      for (i = 0; i < 32; ++i)
+	RTVEC_ELT (v, i)
+	  = GEN_INT (i * 2 + ((i & 24) == 8 ? 16 : (i & 24) == 16 ? -16 : 0));
+      t[0] = operands[0];
+      t[1] = t[5];
+      t[2] = t[4];
+      t[3] = gen_rtx_CONST_VECTOR (<MODE>mode, v);
+      ix86_expand_vec_perm_const (t);
+    }
 
   set_unique_reg_note (get_last_insn (), REG_EQUAL,
 		       gen_rtx_MULT (<MODE>mode, operands[1], operands[2]));