summaryrefslogtreecommitdiff
path: root/libm/w_tgammaf.c
diff options
context:
space:
mode:
Diffstat (limited to 'libm/w_tgammaf.c')
-rw-r--r--libm/w_tgammaf.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/libm/w_tgammaf.c b/libm/w_tgammaf.c
new file mode 100644
index 000000000..812e7d5b6
--- /dev/null
+++ b/libm/w_tgammaf.c
@@ -0,0 +1,48 @@
+/* w_gammaf.c -- float version of w_gamma.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * 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"
+#if __UCLIBC_HAS_FENV__
+#include <errno.h>
+#endif
+
+float
+tgammaf(float x)
+{
+#if __UCLIBC_HAS_FENV__
+ float y = (float) __ieee754_tgamma((double)x);
+
+ if(__builtin_expect (!isfinite (y) || y == 0, 0)
+ && (isfinite (x) || (isinf (x) && x < 0.0))
+ && _LIB_VERSION != _IEEE_) {
+ if (x == (float)0.0)
+ /* tgammaf pole */
+ return __kernel_standard_f(x, x, 150);
+ else if(floorf(x)==x&&x<0.0f)
+ /* tgammaf domain */
+ return __kernel_standard_f(x, x, 141);
+ else if (y == 0)
+ /* tgammaf underflow */
+ __set_errno (ERANGE);
+ else
+ /* tgammaf overflow */
+ return __kernel_standard_f(x, x, 140);
+ }
+ return y;
+#else
+ return (float) __ieee754_tgamma((double)x);
+#endif /* __UCLIBC_HAS_FENV__ */
+}