i386: Fix up *avx_vperm_broadcast_v4df [PR93430]

Apparently my recent patch which moved the *avx_vperm_broadcast* and
*vpermil* patterns before vpermpd broke the following testcase, the
define_insn_and_split matched always but the splitter condition only split
it if not -mavx2 for V4DFmode, basically relying on the vpermpd pattern to
come first.

The following patch fixes it by moving that part of SPLIT-CONDITION into
CONDITION, so that when it is not met, we just don't match the pattern
and thus match the later vpermpd pattern in that case.
Except, for { 0, 0, 0, 0 } permutation, there is actually no reason to do
that, vbroadcastsd from memory seems to be slightly cheaper than vpermpd $0.

2020-01-26  Jakub Jelinek  <jakub@redhat.com>

	PR target/93430
	* config/i386/sse.md (*avx_vperm_broadcast_<mode>): Disallow for
	TARGET_AVX2 and V4DFmode not in the split condition, but in the
	pattern condition, though allow { 0, 0, 0, 0 } broadcast always.

	* gcc.dg/pr93430.c: New test.
	* gcc.target/i386/avx2-pr93430.c: New test.

gcc/ChangeLog

+2020-01-26  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/93430
+	* config/i386/sse.md (*avx_vperm_broadcast_<mode>): Disallow for
+	TARGET_AVX2 and V4DFmode not in the split condition, but in the
+	pattern condition, though allow { 0, 0, 0, 0 } broadcast always.
+
 2020-01-25  Feng Xue  <fxue@os.amperecomputing.com>
 
 	PR ipa/93166

gcc/config/i386/sse.md

@@ -19912,9 +19912,10 @@
 	  (match_operand:VF_256 1 "nonimmediate_operand" "m,o,?v")
 	  (match_parallel 2 "avx_vbroadcast_operand"
 	    [(match_operand 3 "const_int_operand" "C,n,n")])))]
-  "TARGET_AVX"
+  "TARGET_AVX
+   && (<MODE>mode != V4DFmode || !TARGET_AVX2 || operands[3] == const0_rtx)"
   "#"
-  "&& reload_completed && (<MODE>mode != V4DFmode || !TARGET_AVX2)"
+  "&& reload_completed"
   [(set (match_dup 0) (vec_duplicate:VF_256 (match_dup 1)))]
 {
   rtx op0 = operands[0], op1 = operands[1];

gcc/testsuite/ChangeLog

 2020-01-26  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/93430
+	* gcc.dg/pr93430.c: New test.
+	* gcc.target/i386/avx2-pr93430.c: New test.
+
 	PR ipa/93166
 	* g++.dg/pr93166.C: Move to ...
 	* g++.dg/pr93166_0.C: ... here.  Turn it into a proper lto test.

gcc/testsuite/gcc.dg/pr93430.c

+/* PR target/93430 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-additional-options "-mavx -mno-avx2" { target avx } } */
+
+typedef double V __attribute__((vector_size (4 * sizeof (double))));
+typedef long long VI __attribute__((vector_size (4 * sizeof (long long))));
+
+#if __SIZEOF_DOUBLE__ == __SIZEOF_LONG_LONG__
+void
+foo (V *x, V *y)
+{
+  y[0] = __builtin_shuffle (x[0], x[0], (VI) { 0, 0, 0, 0 });
+}
+
+void
+bar (V *x, V *y)
+{
+  y[0] = __builtin_shuffle (x[0], x[0], (VI) { 1, 1, 1, 1 });
+}
+
+void
+baz (V *x, V *y)
+{
+  y[0] = __builtin_shuffle (x[0], x[0], (VI) { 2, 2, 2, 2 });
+}
+
+void
+qux (V *x, V *y)
+{
+  y[0] = __builtin_shuffle (x[0], x[0], (VI) { 3, 3, 3, 3 });
+}
+#endif

gcc/testsuite/gcc.target/i386/avx2-pr93430.c

+/* PR target/93430 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx2" } */
+
+#include "../../gcc.dg/pr93430.c"