about summary refs log tree commit diff
path: root/sysdeps/libm-ieee754/w_pow.c
diff options
context:
space:
mode:
authorRoland McGrath <roland@gnu.org>1996-03-05 21:41:30 +0000
committerRoland McGrath <roland@gnu.org>1996-03-05 21:41:30 +0000
commitf7eac6eb504f4baf13dbb4d26717942df050ebe6 (patch)
tree95ff129c06c7f6f246a5e2bfa489ba6382659d19 /sysdeps/libm-ieee754/w_pow.c
parent1521668f2afae1dc2ef5d7ffaeb84353b36874dd (diff)
downloadglibc-f7eac6eb504f4baf13dbb4d26717942df050ebe6.tar.gz
glibc-f7eac6eb504f4baf13dbb4d26717942df050ebe6.tar.xz
glibc-f7eac6eb504f4baf13dbb4d26717942df050ebe6.zip
Mon Mar 4 20:54:40 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
	* Makeconfig ($(common-objpfx)config.make): Depend on config.h.in.


Mon Mar  4 17:35:09 1996  Roland McGrath  <roland@charlie-brown.gnu.ai.mit.edu>

	* hurd/catch-signal.c (hurd_safe_memmove): New function.
	(hurd_safe_copyin, hurd_safe_copyout): New functions.
	* hurd/hurd/sigpreempt.h: Declare them.

Sun Mar  3 08:43:44 1996  Roland McGrath  <roland@charlie-brown.gnu.ai.mit.edu>

	Replace math code with fdlibm from Sun as modified for netbsd by
	JT Conklin and Ian Taylor, including x86 FPU support.
	* sysdeps/libm-ieee754, sysdeps/libm-i387: New directories.
	* math/math_private.h: New file.
	* sysdeps/i386/fpu/Implies: New file.
	* sysdeps/ieee754/Implies: New file.
	* math/machine/asm.h, math/machine/endian.h: New files.
	* math/Makefile, math/math.h: Rewritten.
	* mathcalls.h, math/mathcalls.h: New file, broken out of math.h.
	* math/finite.c: File removed.
	* sysdeps/generic/Makefile [$(subdir)=math]: Frobnication removed.

	* math/test-math.c: Include errno.h and string.h.

	* sysdeps/unix/bsd/dirstream.h: File removed.
	* sysdeps/unix/bsd/readdir.c: File removed.
Diffstat (limited to 'sysdeps/libm-ieee754/w_pow.c')
-rw-r--r--sysdeps/libm-ieee754/w_pow.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/w_pow.c b/sysdeps/libm-ieee754/w_pow.c
new file mode 100644
index 0000000000..adc1b2b0b7
--- /dev/null
+++ b/sysdeps/libm-ieee754/w_pow.c
@@ -0,0 +1,62 @@
+
+
+/* @(#)w_pow.c 5.2 93/10/01 */
+/*
+ * ====================================================
+ * 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 pow(x,y) return x**y
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+
+#ifdef __STDC__
+	double __pow(double x, double y)	/* wrapper pow */
+#else
+	double __pow(x,y)			/* wrapper pow */
+	double x,y;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return  __ieee754_pow(x,y);
+#else
+	double z;
+	z=__ieee754_pow(x,y);
+	if(_LIB_VERSION == _IEEE_|| __isnan(y)) return z;
+	if(__isnan(x)) {
+	    if(y==0.0) 
+	        return __kernel_standard(x,y,42); /* pow(NaN,0.0) */
+	    else 
+		return z;
+	}
+	if(x==0.0){ 
+	    if(y==0.0)
+	        return __kernel_standard(x,y,20); /* pow(0.0,0.0) */
+	    if(__finite(y)&&y<0.0)
+	        return __kernel_standard(x,y,23); /* pow(0.0,negative) */
+	    return z;
+	}
+	if(!__finite(z)) {
+	    if(__finite(x)&&__finite(y)) {
+	        if(__isnan(z))
+	            return __kernel_standard(x,y,24); /* pow neg**non-int */
+	        else 
+	            return __kernel_standard(x,y,21); /* pow overflow */
+	    }
+	} 
+	if(z==0.0&&__finite(x)&&__finite(y))
+	    return __kernel_standard(x,y,22); /* pow underflow */
+	return z;
+#endif
+}
+weak_alias (__pow, pow)