Implement sqrtf(), needed for libstdc++ on arm

 -Erik

2 files changed, 47 insertions, 1 deletions

diff --git a/libm/Makefile b/libm/Makefile
index a6e8e26a9..433d32470 100644
--- a/libm/Makefile
+++ b/libm/Makefile
@@ -62,7 +62,7 @@ CSRC =   e_acos.c e_acosh.c e_asin.c e_atan2.c e_atanh.c e_cosh.c\
          w_cosh.c w_drem.c w_exp.c w_fmod.c w_gamma.c w_gamma_r.c\
          w_hypot.c w_j0.c w_j1.c w_jn.c w_lgamma.c w_lgamma_r.c\
          w_log.c w_log10.c w_pow.c w_remainder.c w_scalb.c w_sinh.c\
-         w_sqrt.c fpmacros.c
+         w_sqrt.c w_sqrtf.c fpmacros.c
 else
 # This list of math functions was taken from POSIX/IEEE 1003.1b-1993
 CSRC =   w_acos.c w_asin.c s_atan.c w_atan2.c s_ceil.c s_cos.c \
diff --git a/libm/w_sqrtf.c b/libm/w_sqrtf.c
new file mode 100644
index 000000000..771d5b198
--- /dev/null
+++ b/libm/w_sqrtf.c
@@ -0,0 +1,46 @@
+/* vi: set sw=4 ts=4: */
+/* sqrtf for uClibc
+ *
+ * Copyright (C) 2002 by Erik Andersen <andersen@uclibc.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program 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 Library General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/* 
+ * wrapper for sqrt(x)
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+	float sqrtf(float x)		/* wrapper sqrt */
+#else
+	float sqrtf(x)			/* wrapper sqrt */
+	float x;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_sqrt(x);
+#else
+	float z;
+	z = __ieee754_sqrt(x);
+	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
+	if(x<0.0) {
+	    return __kernel_standard(x,x,26); /* sqrt(negative) */
+	} else
+	    return z;
+#endif
+}