some extra math functions from netbsd for netpbm.

2011-01-30 23:40:51 +00:00
parent d5322973fa
commit dee29bbd3c
5 changed files with 633 additions and 1 deletions
--- a/lib/libc/math/mathimpl.h
+++ b/lib/libc/math/mathimpl.h
@@ -0,0 +1,114 @@
+/*	$NetBSD: mathimpl.h,v 1.9 2008/05/01 15:33:15 christos Exp $	*/
+/*
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)mathimpl.h	8.1 (Berkeley) 6/4/93
+ */
+#ifndef _NOIEEE_SRC_MATHIMPL_H_
+#define _NOIEEE_SRC_MATHIMPL_H_
+
+#include <sys/cdefs.h>
+#include <math.h>
+#include <stdint.h>
+
+#if defined(__vax__) || defined(tahoe)
+
+/* Deal with different ways to concatenate in cpp */
+#define cat3(a,b,c)	a ## b ## c
+
+/* Deal with vax/tahoe byte order issues */
+#  ifdef __vax__
+#    define	cat3t(a,b,c) cat3(a,b,c)
+#  else
+#    define	cat3t(a,b,c) cat3(a,c,b)
+#  endif
+
+#  define vccast(name) (cat3(__,name,x).d)
+
+   /*
+    * Define a constant to high precision on a Vax or Tahoe.
+    *
+    * Args are the name to define, the decimal floating point value,
+    * four 16-bit chunks of the float value in hex
+    * (because the vax and tahoe differ in float format!), the power
+    * of 2 of the hex-float exponent, and the hex-float mantissa.
+    * Most of these arguments are not used at compile time; they are
+    * used in a post-check to make sure the constants were compiled
+    * correctly.
+    *
+    * People who want to use the constant will have to do their own
+    *     #define foo vccast(foo)
+    * since CPP cannot do this for them from inside another macro (sigh).
+    * We define "vccast" if this needs doing.
+    */
+#ifdef _LIBM_DECLARE
+#  define vc(name, value, x1,x2,x3,x4, bexp, xval) \
+    const union { uint32_t l[2]; double d; } cat3(__,name,x) = { \
+	.l = { [0] = cat3t(0x,x1,x2), [1] = cat3t(0x,x3,x4) } };
+#elif defined(_LIBM_STATIC)
+#  define vc(name, value, x1,x2,x3,x4, bexp, xval) \
+    static const union { uint32_t l[2]; double d; } cat3(__,name,x) = { \
+	.l = { [0] = cat3t(0x,x1,x2), [1] = cat3t(0x,x3,x4) } };
+#else
+#  define vc(name, value, x1,x2,x3,x4, bexp, xval) \
+	extern const union { uint32_t l[2]; double d; } cat3(__,name,x);
+#endif
+#  define ic(name, value, bexp, xval) 
+
+#else	/* __vax__ or tahoe */
+
+   /* Hooray, we have an IEEE machine */
+#  undef vccast
+#  define vc(name, value, x1,x2,x3,x4, bexp, xval) 
+
+#ifdef _LIBM_DECLARE
+#  define ic(name, value, bexp, xval) \
+	const double __CONCAT(__,name) = value;
+#elif _LIBM_STATIC
+#  define ic(name, value, bexp, xval) \
+	static const double __CONCAT(__,name) = value;
+#else
+#  define ic(name, value, bexp, xval) \
+	extern const double __CONCAT(__,name);
+#endif
+
+#endif	/* defined(__vax__)||defined(tahoe) */
+
+
+/*
+ * Functions internal to the math package, yet not static.
+ */
+extern double	__exp__E(double, double);
+extern double	__log__L(double);
+extern int	infnan(int);
+
+struct Double {double a, b;};
+double __exp__D(double, double);
+struct Double __log__D(double);
+
+#endif /* _NOIEEE_SRC_MATHIMPL_H_ */