Fix ldbl-128ibm remainderl equality test for zero low part (bug 19677).

[thirdparty/glibc.git] / sysdeps / ieee754 / ldbl-128ibm / test-fmodrem-ldbl-128ibm.c

diff --git a/sysdeps/ieee754/ldbl-128ibm/test-fmodrem-ldbl-128ibm.c b/sysdeps/ieee754/ldbl-128ibm/test-fmodrem-ldbl-128ibm.c
new file mode 100644 (file)
index 0000000..4e1640c
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128ibm/test-fmodrem-ldbl-128ibm.c
@@ -0,0 +1,84 @@
+/* Test for ldbl-128ibm fmodl etc. handling of equal values.
+   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 <fenv.h>
+#include <float.h>
+#include <math.h>
+#include <stdio.h>
+
+/* FUNC is defined to be the name of the function to test.  */
+#define STRX(x) #x
+#define STR(x) STRX (x)
+#define SFUNC STR (FUNC)
+
+union u
+{
+  long double ld;
+  double d[2];
+};
+
+volatile union u p1 = { .d = { DBL_MIN, 0.0 } };
+volatile union u p2 = { .d = { DBL_MIN, -0.0 } };
+volatile union u m1 = { .d = { -DBL_MIN, 0.0 } };
+volatile union u m2 = { .d = { -DBL_MIN, -0.0 } };
+
+static int
+test_func (const char *s, long double x, long double y, long double expected)
+{
+  volatile long double r;
+  r = FUNC (x, y);
+  if (r != expected || copysignl (1.0, r) != copysignl (1.0, expected))
+    {
+      printf ("FAIL: " SFUNC " (%s)\n", s);
+      return 1;
+    }
+  else
+    {
+      printf ("PASS: " SFUNC " (%s)\n", s);
+      return 0;
+    }
+}
+
+#define TEST_FUNC(a, b, e) test_func (#a ", " #b, a, b, e)
+
+static int
+do_test (void)
+{
+  int result = 0;
+  SETUP;
+  result |= TEST_FUNC (p1.ld, p1.ld, 0.0L);
+  result |= TEST_FUNC (p1.ld, p2.ld, 0.0L);
+  result |= TEST_FUNC (p1.ld, m1.ld, 0.0L);
+  result |= TEST_FUNC (p1.ld, m2.ld, 0.0L);
+  result |= TEST_FUNC (p2.ld, p1.ld, 0.0L);
+  result |= TEST_FUNC (p2.ld, p2.ld, 0.0L);
+  result |= TEST_FUNC (p2.ld, m1.ld, 0.0L);
+  result |= TEST_FUNC (p2.ld, m2.ld, 0.0L);
+  result |= TEST_FUNC (m1.ld, p1.ld, -0.0L);
+  result |= TEST_FUNC (m1.ld, p2.ld, -0.0L);
+  result |= TEST_FUNC (m1.ld, m1.ld, -0.0L);
+  result |= TEST_FUNC (m1.ld, m2.ld, -0.0L);
+  result |= TEST_FUNC (m2.ld, p1.ld, -0.0L);
+  result |= TEST_FUNC (m2.ld, p2.ld, -0.0L);
+  result |= TEST_FUNC (m2.ld, m1.ld, -0.0L);
+  result |= TEST_FUNC (m2.ld, m2.ld, -0.0L);
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../../../test-skeleton.c"