--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.target/powerpc/vec-gnb-2.c	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,73 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target int128 } */
+/* { dg-options "-mdejagnu-cpu=future" } */
+
+#include <altivec.h>
+
+extern void abort (void);
+
+unsigned long long int
+do_vec_gnb (vector unsigned __int128 source, int stride)
+{
+  switch (stride)
+    {
+    case 2:
+      return vec_gnb (source, 0);	/* { dg-error "between 2 and 7" } */
+    case 3:
+      return vec_gnb (source, -1);	/* { dg-error "between 2 and 7" } */
+    case 4:
+      return vec_gnb (source, 8);	/* { dg-error "between 2 and 7" } */
+    case 5:
+      return vec_gnb (source, 1);	/* { dg-error "between 2 and 7" } */
+    case 6:
+      return vec_gnb (source, stride);	/* { dg-error "unsigned literal" } */
+    case 7:
+      return vec_gnb (source, 7);
+
+    default:
+      /* Illegal value of stride */
+      abort ();
+      return 0;
+    }
+}
+
+int
+main (int argc, char *argv [])
+{
+  /* For result = 0xaaaa_0000_0000_0000, use:
+      stride = 2: binary 1x0x_1x0x_1x0x_... = 0x8888_8888_0000_0000, 0
+      stride = 4: binary 1xxx_0xxx_1xxx_0xxxx = 0x8080_8080_8080_8080, 0
+
+     For result = 0xaaaa_aaaa_0000_0000, use:
+      stride = 2: source = 0x8888_8888_8888_8888, 0x0 }
+      stride = 4: source = { 0x8080_8080_8080_8080, 0x8080_8080_8080_8080 }
+  */
+
+  /* The last array element appears in the left-most (first) bit
+     positions of the vector register.  */
+  vector unsigned __int128 source_a =
+    { ((unsigned __int128) 0x8888888800000000ull) << 64 };
+  vector unsigned __int128 source_b =
+    { ((unsigned __int128) 0x8080808080808080ull) << 64 };
+  vector unsigned __int128 source_c =
+    { ((unsigned __int128) 0x8888888888888888ull) << 64 };
+  vector unsigned __int128 source_d =
+    { 0x8080808080808080ull |
+      ((unsigned __int128) 0x8080808080808080ull) << 64 };
+
+  unsigned long long int results [] =
+    { 0xaaaa000000000000ull, 0xaaaa000000000000ull,
+      0xaaaaaaaa00000000ull, 0xaaaaaaaa00000000ull };
+
+  if (do_vec_gnb (source_a, 2) != results [0])
+    abort ();
+  if (do_vec_gnb (source_b, 4) != results [1])
+    abort ();
+  if (do_vec_gnb (source_c, 2) != results [2])
+    abort ();
+  if (do_vec_gnb (source_d, 4) != results [3])
+    abort ();
+
+  return 0;
+}
+