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authorSergey Cherkashin <4erkashin@list.ru>2017-10-03 15:26:34 +0300
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2017-11-03 20:23:10 +0100
commitea38f4d89c9698895b1cf53a5946429dc1d8bbaa (patch)
treee05828ca1fedf55f104b837bc9c44215c2978e99 /libm/k_standardl.c
parent68de9946e914d8c30dcc6667a059ea59e5b74cac (diff)
math: add exception handling functionality
According to standards SVID and SYSV. Modified lgamma calling in case when 'signgam' variable should not be used. Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
Diffstat (limited to 'libm/k_standardl.c')
-rw-r--r--libm/k_standardl.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/libm/k_standardl.c b/libm/k_standardl.c
new file mode 100644
index 000000000..19d2a3ec2
--- /dev/null
+++ b/libm/k_standardl.c
@@ -0,0 +1,107 @@
+/* Implement __kernel_standard_l.
+ Copyright (C) 2012-2016 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/>.
+
+ Parts based on k_standard.c from fdlibm: */
+
+/* @(#)k_standard.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#include <math.h>
+#include "math_private.h"
+#include <fenv.h>
+#include <float.h>
+#include <errno.h>
+
+
+static double zero = 0.0;
+
+/* Handle errors for a libm function as specified by TYPE (see
+ comments in k_standard.c for details), with arguments X and Y,
+ returning the appropriate return value for that function. */
+
+long double
+__kernel_standard_l (long double x, long double y, int type)
+{
+ double dx, dy;
+ struct exception exc;
+ fenv_t env;
+
+ feholdexcept (&env);
+ dx = x;
+ dy = y;
+ math_force_eval (dx);
+ math_force_eval (dy);
+ fesetenv (&env);
+
+ switch (type)
+ {
+ case 221:
+ /* powl (x, y) overflow. */
+ exc.arg1 = dx;
+ exc.arg2 = dy;
+ exc.type = OVERFLOW;
+ exc.name = (char *) "powl";
+ if (_LIB_VERSION == _SVID_)
+ {
+ exc.retval = HUGE;
+ y *= 0.5;
+ if (x < zero && rint (y) != y)
+ exc.retval = -HUGE;
+ }
+ else
+ {
+ exc.retval = HUGE_VAL;
+ y *= 0.5;
+ if (x < zero && rint (y) != y)
+ exc.retval = -HUGE_VAL;
+ }
+ if (_LIB_VERSION == _POSIX_)
+ __set_errno (ERANGE);
+ else if (!matherr (&exc))
+ __set_errno (ERANGE);
+ return exc.retval;
+
+ case 222:
+ /* powl (x, y) underflow. */
+ exc.arg1 = dx;
+ exc.arg2 = dy;
+ exc.type = UNDERFLOW;
+ exc.name = (char *) "powl";
+ exc.retval = zero;
+ y *= 0.5;
+ if (x < zero && rint (y) != y)
+ exc.retval = -zero;
+ if (_LIB_VERSION == _POSIX_)
+ __set_errno (ERANGE);
+ else if (!matherr (&exc))
+ __set_errno (ERANGE);
+ return exc.retval;
+
+ default:
+ return __kernel_standard (dx, dy, type);
+ }
+}