S/390: Fix zvector vec_double builtin

The (unsigned) long int to double vector conversion instructions
expect 2 immediate parameters. One for the inexact suppression
control and another one for the rounding mode.  However, the
vec_double builtin has just the vector source operand.  The 2
addtional operands need to be added with an intermediate expander.
The expanders were already there but unfortunately not wired up
correctly to the builtin.

gcc/ChangeLog:

2018-12-13  Andreas Krebbel  <krebbel@linux.ibm.com>

	* config/s390/s390-builtins.def (s390_vec_double_s64): Map to
	s390_vec_double_s64 instead of s390_vcdgb.
	(s390_vec_double_u64): Map to s390_vec_double_u64 instead of
	s390_vcdlgb.

gcc/testsuite/ChangeLog:

2018-12-13  Andreas Krebbel  <krebbel@linux.ibm.com>

	* gcc.target/s390/zvector/vec-double-1.c: New test.
	* gcc.target/s390/zvector/vec-double-2.c: New test.

From-SVN: r267084

gcc/ChangeLog

 2018-12-13  Andreas Krebbel  <krebbel@linux.ibm.com>
 
+	* config/s390/s390-builtins.def (s390_vec_double_s64): Map to
+	s390_vec_double_s64 instead of s390_vcdgb.
+	(s390_vec_double_u64): Map to s390_vec_double_u64 instead of
+	s390_vcdlgb.
+
+2018-12-13  Andreas Krebbel  <krebbel@linux.ibm.com>
+
 	* config/s390/vx-builtins.md ("vec_ctd_s64", "vec_ctd_u64")
 	("vec_ctsl", "vec_ctul"): Replace 0 with VEC_NOINEXACT.
 	("vec_double_s64", "vec_double_u64"): Replace 4 with VEC_INEXACT.

gcc/config/s390/s390-builtins.def

@@ -2811,8 +2811,8 @@ B_DEF      (s390_vfsqsb,                sqrtv4sf2,          0,
 B_DEF      (s390_vfsqdb,                sqrtv2df2,          0,                  B_VX,               0,                  BT_FN_V2DF_V2DF)
 
 OB_DEF     (s390_vec_double,            s390_vec_double_s64,s390_vec_double_u64,B_VX,               BT_FN_OV4SI_OV4SI)
-OB_DEF_VAR (s390_vec_double_s64,        s390_vcdgb,         0,                  0,                  BT_OV_V2DF_V2DI)
-OB_DEF_VAR (s390_vec_double_u64,        s390_vcdlgb,        0,                  0,                  BT_OV_V2DF_UV2DI)
+OB_DEF_VAR (s390_vec_double_s64,        s390_vec_double_s64,0,                  0,                  BT_OV_V2DF_V2DI)
+OB_DEF_VAR (s390_vec_double_u64,        s390_vec_double_u64,0,                  0,                  BT_OV_V2DF_UV2DI)
 
 B_DEF      (s390_vec_double_s64,        vec_double_s64,     0,                  B_INT | B_VX,       0,                  BT_FN_V2DF_V2DI)  /* vcdgb */
 B_DEF      (s390_vec_double_u64,        vec_double_u64,     0,                  B_INT | B_VX,       0,                  BT_FN_V2DF_UV2DI) /* vcdlgb */

gcc/testsuite/ChangeLog

+2018-12-13  Andreas Krebbel  <krebbel@linux.ibm.com>
+
+	* gcc.target/s390/zvector/vec-double-1.c: New test.
+	* gcc.target/s390/zvector/vec-double-2.c: New test.
+
 2018-12-13  Wei Xiao  <wei3.xiao@intel.com>
 
 	* gcc.target/i386/funcspec-56.inc: Handle new march.

gcc/testsuite/gcc.target/s390/zvector/vec-double-1.c

+/* { dg-do compile } */
+/* { dg-options "-O3 -mzarch -march=z13 -mzvector" } */
+
+#include <vecintrin.h>
+
+vector double
+test (vector unsigned long long x)
+{
+  return vec_double (x);
+}
+
+/* { dg-final { scan-assembler-times "vcdlgb\t" 1 } } */

gcc/testsuite/gcc.target/s390/zvector/vec-double-2.c

+/* { dg-do compile } */
+/* { dg-options "-O3 -mzarch -march=z13 -mzvector" } */
+
+#include <vecintrin.h>
+
+vector double
+test (vector long long x)
+{
+  return vec_double (x);
+}
+
+/* { dg-final { scan-assembler-times "vcdgb\t" 1 } } */