src/libm/math_private.h
changeset 2756 a98604b691c8
child 2760 02aa80d7905f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libm/math_private.h	Mon Sep 15 06:33:23 2008 +0000
@@ -0,0 +1,204 @@
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/*
+ * from: @(#)fdlibm.h 5.1 93/09/24
+ * $Id: math_private.h,v 1.3 2004/02/09 07:10:38 andersen Exp $
+ */
+
+#ifndef _MATH_PRIVATE_H_
+#define _MATH_PRIVATE_H_
+
+/*#include <endian.h>*/
+#include <sys/types.h>
+
+#define attribute_hidden
+#define libm_hidden_proto(x)
+#define libm_hidden_def(x)
+
+/* The original fdlibm code used statements like:
+	n0 = ((*(int*)&one)>>29)^1;		* index of high word *
+	ix0 = *(n0+(int*)&x);			* high word of x *
+	ix1 = *((1-n0)+(int*)&x);		* low word of x *
+   to dig two 32 bit words out of the 64 bit IEEE floating point
+   value.  That is non-ANSI, and, moreover, the gcc instruction
+   scheduler gets it wrong.  We instead use the following macros.
+   Unlike the original code, we determine the endianness at compile
+   time, not at run time; I don't see much benefit to selecting
+   endianness at run time.  */
+
+/* A union which permits us to convert between a double and two 32 bit
+   ints.  */
+
+/*
+ * Math on arm is special:
+ * For FPA, float words are always big-endian.
+ * For VFP, floats words follow the memory system mode.
+ */
+
+#if (__BYTE_ORDER == __BIG_ENDIAN) || \
+    (!defined(__VFP_FP__) && (defined(__arm__) || defined(__thumb__)))
+
+typedef union
+{
+    double value;
+    struct
+    {
+        u_int32_t msw;
+        u_int32_t lsw;
+    } parts;
+} ieee_double_shape_type;
+
+#else
+
+typedef union
+{
+    double value;
+    struct
+    {
+        u_int32_t lsw;
+        u_int32_t msw;
+    } parts;
+} ieee_double_shape_type;
+
+#endif
+
+/* Get two 32 bit ints from a double.  */
+
+#define EXTRACT_WORDS(ix0,ix1,d)				\
+do {								\
+  ieee_double_shape_type ew_u;					\
+  ew_u.value = (d);						\
+  (ix0) = ew_u.parts.msw;					\
+  (ix1) = ew_u.parts.lsw;					\
+} while (0)
+
+/* Get the more significant 32 bit int from a double.  */
+
+#define GET_HIGH_WORD(i,d)					\
+do {								\
+  ieee_double_shape_type gh_u;					\
+  gh_u.value = (d);						\
+  (i) = gh_u.parts.msw;						\
+} while (0)
+
+/* Get the less significant 32 bit int from a double.  */
+
+#define GET_LOW_WORD(i,d)					\
+do {								\
+  ieee_double_shape_type gl_u;					\
+  gl_u.value = (d);						\
+  (i) = gl_u.parts.lsw;						\
+} while (0)
+
+/* Set a double from two 32 bit ints.  */
+
+#define INSERT_WORDS(d,ix0,ix1)					\
+do {								\
+  ieee_double_shape_type iw_u;					\
+  iw_u.parts.msw = (ix0);					\
+  iw_u.parts.lsw = (ix1);					\
+  (d) = iw_u.value;						\
+} while (0)
+
+/* Set the more significant 32 bits of a double from an int.  */
+
+#define SET_HIGH_WORD(d,v)					\
+do {								\
+  ieee_double_shape_type sh_u;					\
+  sh_u.value = (d);						\
+  sh_u.parts.msw = (v);						\
+  (d) = sh_u.value;						\
+} while (0)
+
+/* Set the less significant 32 bits of a double from an int.  */
+
+#define SET_LOW_WORD(d,v)					\
+do {								\
+  ieee_double_shape_type sl_u;					\
+  sl_u.value = (d);						\
+  sl_u.parts.lsw = (v);						\
+  (d) = sl_u.value;						\
+} while (0)
+
+/* A union which permits us to convert between a float and a 32 bit
+   int.  */
+
+typedef union
+{
+    float value;
+    u_int32_t word;
+} ieee_float_shape_type;
+
+/* Get a 32 bit int from a float.  */
+
+#define GET_FLOAT_WORD(i,d)					\
+do {								\
+  ieee_float_shape_type gf_u;					\
+  gf_u.value = (d);						\
+  (i) = gf_u.word;						\
+} while (0)
+
+/* Set a float from a 32 bit int.  */
+
+#define SET_FLOAT_WORD(d,i)					\
+do {								\
+  ieee_float_shape_type sf_u;					\
+  sf_u.word = (i);						\
+  (d) = sf_u.value;						\
+} while (0)
+
+/* ieee style elementary functions */
+extern double
+__ieee754_sqrt(double)
+    attribute_hidden;
+     extern double __ieee754_acos(double) attribute_hidden;
+     extern double __ieee754_acosh(double) attribute_hidden;
+     extern double __ieee754_log(double) attribute_hidden;
+     extern double __ieee754_atanh(double) attribute_hidden;
+     extern double __ieee754_asin(double) attribute_hidden;
+     extern double __ieee754_atan2(double, double) attribute_hidden;
+     extern double __ieee754_exp(double) attribute_hidden;
+     extern double __ieee754_cosh(double) attribute_hidden;
+     extern double __ieee754_fmod(double, double) attribute_hidden;
+     extern double __ieee754_pow(double, double) attribute_hidden;
+     extern double __ieee754_lgamma_r(double, int *) attribute_hidden;
+     extern double __ieee754_gamma_r(double, int *) attribute_hidden;
+     extern double __ieee754_lgamma(double) attribute_hidden;
+     extern double __ieee754_gamma(double) attribute_hidden;
+     extern double __ieee754_log10(double) attribute_hidden;
+     extern double __ieee754_sinh(double) attribute_hidden;
+     extern double __ieee754_hypot(double, double) attribute_hidden;
+     extern double __ieee754_j0(double) attribute_hidden;
+     extern double __ieee754_j1(double) attribute_hidden;
+     extern double __ieee754_y0(double) attribute_hidden;
+     extern double __ieee754_y1(double) attribute_hidden;
+     extern double __ieee754_jn(int, double) attribute_hidden;
+     extern double __ieee754_yn(int, double) attribute_hidden;
+     extern double __ieee754_remainder(double, double) attribute_hidden;
+     extern int __ieee754_rem_pio2(double, double *) attribute_hidden;
+#if defined(_SCALB_INT)
+     extern double __ieee754_scalb(double, int) attribute_hidden;
+#else
+     extern double __ieee754_scalb(double, double) attribute_hidden;
+#endif
+
+/* fdlibm kernel function */
+#ifndef _IEEE_LIBM
+     extern double __kernel_standard(double, double, int) attribute_hidden;
+#endif
+     extern double __kernel_sin(double, double, int) attribute_hidden;
+     extern double __kernel_cos(double, double) attribute_hidden;
+     extern double __kernel_tan(double, double, int) attribute_hidden;
+     extern int __kernel_rem_pio2(double *, double *, int, int, int,
+                                  const int *) attribute_hidden;
+
+#endif /* _MATH_PRIVATE_H_ */