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diff --git a/sysdeps/ieee754/ldbl-128ibm/test-iscanonical-ldbl-128ibm.c b/sysdeps/ieee754/ldbl-128ibm/test-iscanonical-ldbl-128ibm.c
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--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128ibm/test-iscanonical-ldbl-128ibm.c
@@ -0,0 +1,203 @@
+/* Test iscanonical for ldbl-128ibm.
+ Copyright (C) 2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <float.h>
+#include <math.h>
+#include <math_private.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+struct test
+{
+ double hi, lo;
+ bool canonical;
+};
+
+static const struct test tests[] =
+ {
+ { __builtin_nan (""), 0.0, true },
+ { __builtin_nan (""), DBL_MAX, true },
+ { __builtin_nan (""), __builtin_inf (), true },
+ { __builtin_nan (""), __builtin_nan (""), true },
+ { __builtin_nan (""), __builtin_nans (""), true },
+ { __builtin_nans (""), 0.0, true },
+ { __builtin_nans (""), DBL_MAX, true },
+ { __builtin_nans (""), __builtin_inf (), true },
+ { __builtin_nans (""), __builtin_nan (""), true },
+ { __builtin_nans (""), __builtin_nans (""), true },
+ { __builtin_inf (), 0.0, true },
+ { __builtin_inf (), -0.0, true },
+ { -__builtin_inf (), 0.0, true },
+ { -__builtin_inf (), -0.0, true },
+ { __builtin_inf (), DBL_TRUE_MIN, false },
+ { __builtin_inf (), -DBL_TRUE_MIN, false },
+ { -__builtin_inf (), DBL_TRUE_MIN, false },
+ { -__builtin_inf (), -DBL_TRUE_MIN, false },
+ { __builtin_inf (), DBL_MIN, false },
+ { __builtin_inf (), -DBL_MIN, false },
+ { -__builtin_inf (), DBL_MIN, false },
+ { -__builtin_inf (), -DBL_MIN, false },
+ { __builtin_inf (), __builtin_inf (), false },
+ { __builtin_inf (), -__builtin_inf (), false },
+ { -__builtin_inf (), __builtin_inf (), false },
+ { -__builtin_inf (), -__builtin_inf (), false },
+ { __builtin_inf (), __builtin_nan (""), false },
+ { __builtin_inf (), -__builtin_nan (""), false },
+ { -__builtin_inf (), __builtin_nan (""), false },
+ { -__builtin_inf (), -__builtin_nan (""), false },
+ { 0.0, 0.0, true },
+ { 0.0, -0.0, true },
+ { -0.0, 0.0, true },
+ { -0.0, -0.0, true },
+ { 0.0, DBL_TRUE_MIN, false },
+ { 0.0, -DBL_TRUE_MIN, false },
+ { -0.0, DBL_TRUE_MIN, false },
+ { -0.0, -DBL_TRUE_MIN, false },
+ { 0.0, DBL_MAX, false },
+ { 0.0, -DBL_MAX, false },
+ { -0.0, DBL_MAX, false },
+ { -0.0, -DBL_MAX, false },
+ { 0.0, __builtin_inf (), false },
+ { 0.0, -__builtin_inf (), false },
+ { -0.0, __builtin_inf (), false },
+ { -0.0, -__builtin_inf (), false },
+ { 0.0, __builtin_nan (""), false },
+ { 0.0, -__builtin_nan (""), false },
+ { -0.0, __builtin_nan (""), false },
+ { -0.0, -__builtin_nan (""), false },
+ { 1.0, 0.0, true },
+ { 1.0, -0.0, true },
+ { -1.0, 0.0, true },
+ { -1.0, -0.0, true },
+ { 1.0, DBL_TRUE_MIN, true },
+ { 1.0, -DBL_TRUE_MIN, true },
+ { -1.0, DBL_TRUE_MIN, true },
+ { -1.0, -DBL_TRUE_MIN, true },
+ { 1.0, DBL_MAX, false },
+ { 1.0, -DBL_MAX, false },
+ { -1.0, DBL_MAX, false },
+ { -1.0, -DBL_MAX, false },
+ { 1.0, __builtin_inf (), false },
+ { 1.0, -__builtin_inf (), false },
+ { -1.0, __builtin_inf (), false },
+ { -1.0, -__builtin_inf (), false },
+ { 1.0, __builtin_nan (""), false },
+ { 1.0, -__builtin_nan (""), false },
+ { -1.0, __builtin_nan (""), false },
+ { -1.0, -__builtin_nan (""), false },
+ { 0x1p1023, 0x1.1p969, true },
+ { 0x1p1023, -0x1.1p969, true },
+ { -0x1p1023, 0x1.1p969, true },
+ { -0x1p1023, -0x1.1p969, true },
+ { 0x1p1023, 0x1.1p970, false },
+ { 0x1p1023, -0x1.1p970, false },
+ { -0x1p1023, 0x1.1p970, false },
+ { -0x1p1023, -0x1.1p970, false },
+ { 0x1p1023, 0x1p970, true },
+ { 0x1p1023, -0x1p970, true },
+ { -0x1p1023, 0x1p970, true },
+ { -0x1p1023, -0x1p970, true },
+ { 0x1.0000000000001p1023, 0x1p970, false },
+ { 0x1.0000000000001p1023, -0x1p970, false },
+ { -0x1.0000000000001p1023, 0x1p970, false },
+ { -0x1.0000000000001p1023, -0x1p970, false },
+ { 0x1p-969, 0x1.1p-1023, true },
+ { 0x1p-969, -0x1.1p-1023, true },
+ { -0x1p-969, 0x1.1p-1023, true },
+ { -0x1p-969, -0x1.1p-1023, true },
+ { 0x1p-969, 0x1.1p-1022, false },
+ { 0x1p-969, -0x1.1p-1022, false },
+ { -0x1p-969, 0x1.1p-1022, false },
+ { -0x1p-969, -0x1.1p-1022, false },
+ { 0x1p-969, 0x1p-1022, true },
+ { 0x1p-969, -0x1p-1022, true },
+ { -0x1p-969, 0x1p-1022, true },
+ { -0x1p-969, -0x1p-1022, true },
+ { 0x1.0000000000001p-969, 0x1p-1022, false },
+ { 0x1.0000000000001p-969, -0x1p-1022, false },
+ { -0x1.0000000000001p-969, 0x1p-1022, false },
+ { -0x1.0000000000001p-969, -0x1p-1022, false },
+ { 0x1p-970, 0x1.1p-1024, true },
+ { 0x1p-970, -0x1.1p-1024, true },
+ { -0x1p-970, 0x1.1p-1024, true },
+ { -0x1p-970, -0x1.1p-1024, true },
+ { 0x1p-970, 0x1.1p-1023, false },
+ { 0x1p-970, -0x1.1p-1023, false },
+ { -0x1p-970, 0x1.1p-1023, false },
+ { -0x1p-970, -0x1.1p-1023, false },
+ { 0x1p-970, 0x1p-1023, true },
+ { 0x1p-970, -0x1p-1023, true },
+ { -0x1p-970, 0x1p-1023, true },
+ { -0x1p-970, -0x1p-1023, true },
+ { 0x1.0000000000001p-970, 0x1p-1023, false },
+ { 0x1.0000000000001p-970, -0x1p-1023, false },
+ { -0x1.0000000000001p-970, 0x1p-1023, false },
+ { -0x1.0000000000001p-970, -0x1p-1023, false },
+ { 0x1p-1000, 0x1.1p-1054, true },
+ { 0x1p-1000, -0x1.1p-1054, true },
+ { -0x1p-1000, 0x1.1p-1054, true },
+ { -0x1p-1000, -0x1.1p-1054, true },
+ { 0x1p-1000, 0x1.1p-1053, false },
+ { 0x1p-1000, -0x1.1p-1053, false },
+ { -0x1p-1000, 0x1.1p-1053, false },
+ { -0x1p-1000, -0x1.1p-1053, false },
+ { 0x1p-1000, 0x1p-1053, true },
+ { 0x1p-1000, -0x1p-1053, true },
+ { -0x1p-1000, 0x1p-1053, true },
+ { -0x1p-1000, -0x1p-1053, true },
+ { 0x1.0000000000001p-1000, 0x1p-1053, false },
+ { 0x1.0000000000001p-1000, -0x1p-1053, false },
+ { -0x1.0000000000001p-1000, 0x1p-1053, false },
+ { -0x1.0000000000001p-1000, -0x1p-1053, false },
+ { 0x1p-1021, 0x1p-1074, true },
+ { 0x1p-1021, -0x1p-1074, true },
+ { -0x1p-1021, 0x1p-1074, true },
+ { -0x1p-1021, -0x1p-1074, true },
+ { 0x1.0000000000001p-1021, 0x1p-1074, false },
+ { 0x1.0000000000001p-1021, -0x1p-1074, false },
+ { -0x1.0000000000001p-1021, 0x1p-1074, false },
+ { -0x1.0000000000001p-1021, -0x1p-1074, false },
+ { 0x1p-1022, 0x1p-1074, false },
+ { 0x1p-1022, -0x1p-1074, false },
+ { -0x1p-1022, 0x1p-1074, false },
+ { -0x1p-1022, -0x1p-1074, false },
+ };
+
+static int
+do_test (void)
+{
+ int result = 0;
+
+ for (size_t i = 0; i < sizeof (tests) / sizeof (tests[0]); i++)
+ {
+ long double ld = ldbl_pack (tests[i].hi, tests[i].lo);
+ bool canonical = iscanonical (ld);
+ if (canonical == tests[i].canonical)
+ printf ("PASS: test %zu\n", i);
+ else
+ {
+ printf ("FAIL: test %zu\n", i);
+ result = 1;
+ }
+ }
+
+ return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
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