math: x86 trunc traps when FE_INEXACT is enabled (BZ 31603)

[thirdparty/glibc.git] / math / test-trunc-except-2.c

diff --git a/math/test-trunc-except-2.c b/math/test-trunc-except-2.c
new file mode 100644 (file)
index 0000000..8933c6a
--- /dev/null
+++ b/math/test-trunc-except-2.c
@@ -0,0 +1,67 @@
+/* Test trunc functions do not disable exception traps.
+   Copyright (C) 2024 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <fenv.h>
+#include <math.h>
+#include <stdio.h>
+
+#ifndef FE_INEXACT
+# define FE_INEXACT 0
+#endif
+
+#define TEST_FUNC(NAME, FLOAT, SUFFIX)                                 \
+static int                                                             \
+NAME (void)                                                            \
+{                                                                      \
+  int result = 0;                                                      \
+  volatile FLOAT a, b __attribute__ ((unused));                                \
+  a = 1.5;                                                             \
+  /* trunc must work when traps on "inexact" are enabled.  */  \
+  b = trunc ## SUFFIX (a);                                             \
+  /* And it must have left those traps enabled.  */                    \
+  if (fegetexcept () == FE_INEXACT)                                    \
+    puts ("PASS: " #FLOAT);                                            \
+  else                                                                 \
+    {                                                                  \
+      puts ("FAIL: " #FLOAT);                                          \
+      result = 1;                                                      \
+    }                                                                  \
+  return result;                                                       \
+}
+
+TEST_FUNC (float_test, float, f)
+TEST_FUNC (double_test, double, )
+TEST_FUNC (ldouble_test, long double, l)
+
+static int
+do_test (void)
+{
+  if (feenableexcept (FE_INEXACT) == -1)
+    {
+      puts ("enabling FE_INEXACT traps failed, cannot test");
+      return 77;
+    }
+  int result = float_test ();
+  feenableexcept (FE_INEXACT);
+  result |= double_test ();
+  feenableexcept (FE_INEXACT);
+  result |= ldouble_test ();
+  return result;
+}
+
+#include <support/test-driver.c>