re PR target/62128 (Use vpalignr for AVX2 rotation)

PR target/62128
	* config/i386/i386.c (expand_vec_perm_palignr): If op1, op0 order
	of palignr arguments can't be used due to min 0 or max - min
	too high, try also op0, op1 order of palignr arguments.

	* gcc.dg/torture/vshuf-16.inc (TESTS): Add 2 new permutations.
	* gcc.dg/torture/vshuf-32.inc (TESTS): Add 5 new permutations.

From-SVN: r215834

gcc/ChangeLog

@@ -1,3 +1,10 @@
+2014-10-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/62128
+	* config/i386/i386.c (expand_vec_perm_palignr): If op1, op0 order
+	of palignr arguments can't be used due to min 0 or max - min
+	too high, try also op0, op1 order of palignr arguments.
+
 2014-10-02  Jan Hubicka  <hubicka@ucw.cz>
 
 	* cgraph.h (ipa_polymorphic_call_context):

gcc/config/i386/i386.c

@@ -43298,8 +43298,8 @@ static bool
 expand_vec_perm_palignr (struct expand_vec_perm_d *d, bool single_insn_only_p)
 {
   unsigned i, nelt = d->nelt;
-  unsigned min, max;
+  unsigned min, max, minswap, maxswap;
-  bool in_order, ok;
+  bool in_order, ok, swap = false;
   rtx shift, target;
   struct expand_vec_perm_d dcopy;
 
@@ -43309,20 +43309,40 @@ expand_vec_perm_palignr (struct expand_vec_perm_d *d, bool single_insn_only_p)
       && (!TARGET_AVX2 || GET_MODE_SIZE (d->vmode) != 32))
     return false;
 
-  min = 2 * nelt, max = 0;
+  min = 2 * nelt;
+  max = 0;
+  minswap = 2 * nelt;
+  maxswap = 0;
   for (i = 0; i < nelt; ++i)
     {
       unsigned e = d->perm[i];
+      unsigned eswap = d->perm[i] ^ nelt;
       if (GET_MODE_SIZE (d->vmode) == 32)
-	e = (e & ((nelt / 2) - 1)) | ((e & nelt) >> 1);
+	{
+	  e = (e & ((nelt / 2) - 1)) | ((e & nelt) >> 1);
+	  eswap = e ^ (nelt / 2);
+	}
       if (e < min)
 	min = e;
       if (e > max)
 	max = e;
+      if (eswap < minswap)
+	minswap = eswap;
+      if (eswap > maxswap)
+	maxswap = eswap;
     }
   if (min == 0
       || max - min >= (GET_MODE_SIZE (d->vmode) == 32 ? nelt / 2 : nelt))
-    return false;
+    {
+      if (d->one_operand_p
+	  || minswap == 0
+	  || maxswap - minswap >= (GET_MODE_SIZE (d->vmode) == 32
+				   ? nelt / 2 : nelt))
+	return false;
+      swap = true;
+      min = minswap;
+      max = maxswap;
+    }
 
   /* Given that we have SSSE3, we know we'll be able to implement the
      single operand permutation after the palignr with pshufb for
@@ -43332,6 +43352,13 @@ expand_vec_perm_palignr (struct expand_vec_perm_d *d, bool single_insn_only_p)
     return true;
 
   dcopy = *d;
+  if (swap)
+    {
+      dcopy.op0 = d->op1;
+      dcopy.op1 = d->op0;
+      for (i = 0; i < nelt; ++i)
+	dcopy.perm[i] ^= nelt;
+    }
 
   in_order = true;
   for (i = 0; i < nelt; ++i)
@@ -43365,14 +43392,16 @@ expand_vec_perm_palignr (struct expand_vec_perm_d *d, bool single_insn_only_p)
   if (GET_MODE_SIZE (d->vmode) == 16)
     {
       target = gen_reg_rtx (TImode);
-      emit_insn (gen_ssse3_palignrti (target, gen_lowpart (TImode, d->op1),
+      emit_insn (gen_ssse3_palignrti (target, gen_lowpart (TImode, dcopy.op1),
-				      gen_lowpart (TImode, d->op0), shift));
+				      gen_lowpart (TImode, dcopy.op0), shift));
     }
   else
     {
       target = gen_reg_rtx (V2TImode);
-      emit_insn (gen_avx2_palignrv2ti (target, gen_lowpart (V2TImode, d->op1),
+      emit_insn (gen_avx2_palignrv2ti (target,
-				       gen_lowpart (V2TImode, d->op0), shift));
+				       gen_lowpart (V2TImode, dcopy.op1),
+				       gen_lowpart (V2TImode, dcopy.op0),
+				       shift));
     }
 
   dcopy.op0 = dcopy.op1 = gen_lowpart (d->vmode, target);

gcc/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2014-10-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/62128
+	* gcc.dg/torture/vshuf-16.inc (TESTS): Add 2 new permutations.
+	* gcc.dg/torture/vshuf-32.inc (TESTS): Add 5 new permutations.
+
 2014-10-02  Edward Smith-Rowland  <3dw4rd@verizon.net>
 
 	* g++.dg/cpp1y/feat-cxx98-neg.C: Fix double negative thinko and

gcc/testsuite/gcc.dg/torture/vshuf-16.inc

@@ -23,7 +23,9 @@ T (19,	15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) \
 T (20,	0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23) \
 T (21,	8, 24, 9, 25, 10, 26, 11, 27, 12, 28, 13, 29, 14, 30, 15, 31) \
 T (22,	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0) \
-T (23,	14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 15)
+T (23,	14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 15) \
+T (24,	22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 0, 1, 2, 3, 4, 5) \
+T (25,	6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
 #define EXPTESTS \
 T (116,	28, 13, 27, 11, 21, 1, 5, 22, 29, 14, 15, 6, 3, 10, 16, 30) \
 T (117,	22, 26, 1, 13, 29, 3, 18, 18, 11, 21, 12, 28, 19, 5, 7, 4) \

gcc/testsuite/gcc.dg/torture/vshuf-32.inc

@@ -23,7 +23,12 @@ T (19,	31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 1
 T (20,	0, 32, 1, 33, 2, 34, 3, 35, 4, 36, 5, 37, 6, 38, 7, 39, 8, 40, 9, 41, 10, 42, 11, 43, 12, 44, 13, 45, 14, 46, 15, 47) \
 T (21,	16, 48, 17, 49, 18, 50, 19, 51, 20, 52, 21, 53, 22, 54, 23, 55, 24, 56, 25, 57, 26, 58, 27, 59, 28, 60, 29, 61, 30, 62, 31, 63) \
 T (22,	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 0) \
-T (23,	30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 31)
+T (23,	30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 31) \
+T (24,	0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 2, 5, 8, 11, 14, 17, 20, 23, 26, 29) \
+T (25,	11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42) \
+T (26,	21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52) \
+T (27,	22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53) \
+T (28,	38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 0, 1, 2, 3, 4, 5, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 16, 17, 18, 19, 20, 21)
 #define EXPTESTS \
 T (116,	13, 38, 47, 3, 17, 8, 38, 20, 59, 61, 39, 26, 7, 49, 63, 43, 57, 16, 40, 19, 4, 32, 27, 7, 52, 19, 46, 55, 36, 41, 48, 6) \
 T (117,	39, 35, 59, 20, 56, 18, 58, 63, 57, 14, 2, 16, 5, 61, 35, 4, 53, 9, 52, 51, 27, 33, 61, 12, 3, 35, 36, 40, 37, 7, 45, 42) \