---
 gnulib-tests/test-isnanl.h  |    9 +++++++++
 gnulib-tests/test-signbit.c |   10 ++++++++++
 2 files changed, 19 insertions(+)

Index: gnulib-tests/test-isnanl.h
===================================================================
--- gnulib-tests/test-isnanl.h.orig
+++ gnulib-tests/test-isnanl.h
@@ -51,6 +51,15 @@ main ()
   /* A bit pattern that is different from a Quiet NaN.  With a bit of luck,
      it's a Signalling NaN.  */
   {
+#if defined __powerpc__ && LDBL_MANT_DIG == 106
+    /* This is PowerPC "double double", a pair of two doubles.  Inf and Nan are
+       represented as the corresponding 64-bit IEEE values in the first double;
+       the second is ignored.  Manipulate only the first double.  */
+    #undef NWORDS
+    #define NWORDS \
+      ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+#endif
+
     memory_long_double m;
     m.value = NaNl ();
 # if LDBL_EXPBIT0_BIT > 0
Index: gnulib-tests/test-signbit.c
===================================================================
--- gnulib-tests/test-signbit.c.orig
+++ gnulib-tests/test-signbit.c
@@ -151,6 +151,16 @@ test_signbitl ()
     #define NWORDS \
       ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
     typedef union { long double value; unsigned int word[NWORDS]; } memory_long_double;
+
+#if defined __powerpc__ && LDBL_MANT_DIG == 106
+    /* This is PowerPC "double double", a pair of two doubles.  Inf and Nan are
+       represented as the corresponding 64-bit IEEE values in the first double;
+       the second is ignored.  Manipulate only the first double.  */
+    #undef NWORDS
+    #define NWORDS \
+      ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+#endif
+
     memory_long_double m;
     m.value = zerol / zerol;
 # if LDBL_EXPBIT0_BIT > 0