244 lines
6.3 KiB
C
244 lines
6.3 KiB
C
/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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* $QNXLicenseC:
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* Copyright 2007, QNX Software Systems. All Rights Reserved.
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*
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* You must obtain a written license from and pay applicable
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* license fees to QNX Software Systems before you may reproduce,
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* modify or distribute this software, or any work that includes
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* all or part of this software. Free development licenses are
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* available for evaluation and non-commercial purposes. For more
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* information visit http://licensing.qnx.com or email
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* licensing@qnx.com.
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*
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* This file may contain contributions from others. Please review
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* this entire file for other proprietary rights or license notices,
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* as well as the QNX Development Suite License Guide at
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* http://licensing.qnx.com/license-guide/ for other information.
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* $
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*/
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/*
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* from: @(#)fdlibm.h 5.1 93/09/24
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* $Id: math_private.h 153052 2007-11-02 21:10:56Z coreos $
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*/
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#ifndef _MATH_PRIVATE_H_
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#define _MATH_PRIVATE_H_
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//#include <machine/endian.h>
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#include <sys/types.h>
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#include <inttypes.h>
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typedef uint32_t u_int32_t;
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/* The original fdlibm code used statements like:
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n0 = ((*(int*)&one)>>29)^1; * index of high word *
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ix0 = *(n0+(int*)&x); * high word of x *
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ix1 = *((1-n0)+(int*)&x); * low word of x *
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to dig two 32 bit words out of the 64 bit IEEE floating point
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value. That is non-ANSI, and, moreover, the gcc instruction
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scheduler gets it wrong. We instead use the following macros.
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Unlike the original code, we determine the endianness at compile
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time, not at run time; I don't see much benefit to selecting
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endianness at run time. */
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/* A union which permits us to convert between a double and two 32 bit
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ints.
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TF-QNX NOTE:
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It is actually illegal to reference an element of a union as
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one type and then use another member of the union ... the
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results are undefined and actually do crop up ie SET_LOW_WORD:
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fmr f10,f24 ;Move fp to 10
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stfd f10,8(r1) ;Store in memory
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lwz r9,8(r1) ;Pull out int32 values
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lwz r10,12(r1)
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li r10,0 ;Access lower int32 member
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;and store 0 in it
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fmr f30,f10 ;Access the double member
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;it won't be the same as int32
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This is fixed by adding the volatile keyword to the macros.
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*/
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#if defined(__BIGENDIAN__)
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typedef union
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{
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double value;
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struct
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{
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u_int32_t msw;
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u_int32_t lsw;
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} parts;
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} ieee_double_shape_type;
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#endif
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#if defined(__LITTLEENDIAN__)
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#if defined(__ARM__)
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/*
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* FIXME: with the soft-float, ARM FP is bigendian regardless of the CPU...
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*/
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typedef union
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{
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double value;
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struct
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{
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u_int32_t msw;
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u_int32_t lsw;
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} parts;
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} ieee_double_shape_type;
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#else // !defined(__ARM__)
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typedef union
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{
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double value;
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struct
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{
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u_int32_t lsw;
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u_int32_t msw;
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} parts;
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} ieee_double_shape_type;
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#endif // defined(__ARM__)
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#endif
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/* Get two 32 bit ints from a double. */
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#define EXTRACT_WORDS(ix0,ix1,d) \
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do { \
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volatile ieee_double_shape_type ew_u; \
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ew_u.value = (d); \
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(ix0) = ew_u.parts.msw; \
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(ix1) = ew_u.parts.lsw; \
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} while (0)
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/* Get the more significant 32 bit int from a double. */
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#define GET_HIGH_WORD(i,d) \
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do { \
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volatile ieee_double_shape_type gh_u; \
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gh_u.value = (d); \
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(i) = gh_u.parts.msw; \
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} while (0)
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/* Get the less significant 32 bit int from a double. */
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#define GET_LOW_WORD(i,d) \
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do { \
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volatile ieee_double_shape_type gl_u; \
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gl_u.value = (d); \
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(i) = gl_u.parts.lsw; \
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} while (0)
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/* Set a double from two 32 bit ints. */
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#define INSERT_WORDS(d,ix0,ix1) \
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do { \
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volatile ieee_double_shape_type iw_u; \
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iw_u.parts.msw = (ix0); \
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iw_u.parts.lsw = (ix1); \
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(d) = iw_u.value; \
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} while (0)
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/* Set the more significant 32 bits of a double from an int. */
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#define SET_HIGH_WORD(d,v) \
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do { \
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volatile ieee_double_shape_type sh_u; \
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sh_u.value = (d); \
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sh_u.parts.msw = (v); \
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(d) = sh_u.value; \
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} while (0)
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/* Set the less significant 32 bits of a double from an int. */
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#define SET_LOW_WORD(d,v) \
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do { \
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volatile ieee_double_shape_type sl_u; \
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sl_u.value = (d); \
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sl_u.parts.lsw = (v); \
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(d) = sl_u.value; \
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} while (0)
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/* A union which permits us to convert between a float and a 32 bit
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int. */
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typedef union
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{
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float value;
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u_int32_t word;
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} ieee_float_shape_type;
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/* Get a 32 bit int from a float. */
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#define GET_FLOAT_WORD(i,d) \
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do { \
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volatile ieee_float_shape_type gf_u; \
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gf_u.value = (d); \
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(i) = gf_u.word; \
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} while (0)
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/* Set a float from a 32 bit int. */
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#define SET_FLOAT_WORD(d,i) \
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do { \
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volatile ieee_float_shape_type sf_u; \
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sf_u.word = (i); \
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(d) = sf_u.value; \
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} while (0)
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/* ieee style elementary functions */
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#if 0
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extern double __ieee754_log __P((double));
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#else
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#define __ieee754_log log
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#endif
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extern double __ieee754_j0 __P((double));
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extern double __ieee754_j1 __P((double));
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extern double __ieee754_y0 __P((double));
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extern double __ieee754_y1 __P((double));
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extern double __ieee754_jn __P((int,double));
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extern double __ieee754_yn __P((int,double));
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/* ieee style elementary float functions */
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#if 0
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extern float __ieee754_logf __P((float));
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#else
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#define __ieee754_logf logf
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#endif
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extern float __ieee754_j0f __P((float));
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extern float __ieee754_j1f __P((float));
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extern float __ieee754_y0f __P((float));
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extern float __ieee754_y1f __P((float));
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extern float __ieee754_jnf __P((int,float));
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extern float __ieee754_ynf __P((int,float));
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#if 0
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extern float __ieee754_remainderf __P((float,float));
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extern int __ieee754_rem_pio2f __P((float,float*));
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extern float __ieee754_scalbf __P((float,float));
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/* float versions of fdlibm kernel functions */
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extern float __kernel_sinf __P((float,float,int));
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extern float __kernel_cosf __P((float,float));
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extern float __kernel_tanf __P((float,float,int));
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extern int __kernel_rem_pio2f __P((float*,float*,int,int,int,const int*));
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#endif
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#endif /* _MATH_PRIVATE_H_ */
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