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-rw-r--r--math/test-misc.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/math/test-misc.c b/math/test-misc.c
index a1ad6885db..14fe38b90a 100644
--- a/math/test-misc.c
+++ b/math/test-misc.c
@@ -1235,7 +1235,12 @@ main (void)
}
#endif
-#if !defined NO_LONG_DOUBLE && LDBL_MANT_DIG >= DBL_MANT_DIG + 4
+/* Skip testing IBM long double format, for 2 reasons:
+ 1) it only supports FE_TONEAREST
+ 2) nextafter (0.0, 1.0) == nextafterl (0.0L, 1.0L), so
+ nextafter (0.0, 1.0) / 16.0L will be 0.0L. */
+#if !defined NO_LONG_DOUBLE && LDBL_MANT_DIG >= DBL_MANT_DIG + 4 \
+ && LDBL_MANT_DIG != 106
int oldmode = fegetround ();
int j;
for (j = 0; j < 4; j++)