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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/w_lgamma_r.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/w_lgamma_r.c')
-rw-r--r--libm/w_lgamma_r.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/libm/w_lgamma_r.c b/libm/w_lgamma_r.c
new file mode 100644
index 000000000..67ece5a89
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+++ b/libm/w_lgamma_r.c
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+/* @(#)wr_lgamma.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.
+ * ====================================================
+ */
+
+/*
+ * wrapper double lgamma_r(double x, int *signgamp)
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+libm_hidden_proto(lgamma_r)
+double
+lgamma_r(double x, int *signgamp)
+{
+#if __UCLIBC_HAS_FENV__
+ double y = __ieee754_lgamma_r(x,signgamp);
+ if(__builtin_expect(!isfinite(y), 0)
+ && isfinite(x) && _LIB_VERSION != _IEEE_)
+ return __kernel_standard(x, x,
+ floor(x)==x&&x<=0.0
+ ? 15 /* lgamma pole */
+ : 14); /* lgamma overflow */
+
+ return y;
+#else
+ return __ieee754_lgamma_r(x,signgamp);
+#endif /* __UCLIBC_HAS_FENV__ */
+}
+libm_hidden_def(lgamma_r)