mirror of
https://github.com/fluencelabs/musl
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144 lines
5.3 KiB
C
144 lines
5.3 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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#ifndef _MATH_PRIVATE_H_
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#define _MATH_PRIVATE_H_
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#include <inttypes.h>
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/*
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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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*/
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/*
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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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*/
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typedef union
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{
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double value;
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uint64_t words;
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} ieee_double_shape_type;
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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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ieee_double_shape_type ew_u; \
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ew_u.value = (d); \
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(ix0) = ew_u.words >> 32; \
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(ix1) = (uint32_t)ew_u.words; \
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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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ieee_double_shape_type gh_u; \
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gh_u.value = (d); \
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(i) = gh_u.words >> 32; \
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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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ieee_double_shape_type gl_u; \
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gl_u.value = (d); \
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(i) = (uint32_t)gl_u.words; \
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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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ieee_double_shape_type iw_u; \
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iw_u.words = ((uint64_t)(ix0) << 32) | (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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ieee_double_shape_type sh_u; \
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sh_u.value = (d); \
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sh_u.words &= 0xffffffff; \
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sh_u.words |= ((uint64_t)(v) << 32); \
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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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ieee_double_shape_type sl_u; \
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sl_u.value = (d); \
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sl_u.words &= 0xffffffff00000000ull; \
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sl_u.words |= (uint32_t)(v); \
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(d) = sl_u.value; \
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} while (0)
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/*
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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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*/
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typedef union
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{
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float value;
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uint32_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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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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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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/* fdlibm kernel function */
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int __ieee754_rem_pio2(double,double*);
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double __kernel_sin(double,double,int);
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double __kernel_cos(double,double);
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double __kernel_tan(double,double,int);
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int __kernel_rem_pio2(double*,double*,int,int,int,const int*);
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/* float versions of fdlibm kernel functions */
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int __ieee754_rem_pio2f(float,float*);
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float __kernel_sinf(float,float,int);
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float __kernel_cosf(float,float);
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float __kernel_tanf(float,float,int);
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int __kernel_rem_pio2f(float*,float*,int,int,int,const int*);
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#endif /* !_MATH_PRIVATE_H_ */
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