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Cider Isn't Darwin Emulation, Really
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/* * from: @(#)fdlibm.h 5.1 93/09/24 * $FreeBSD: src/lib/msun/src/math_private.h,v 1.17 2005/02/04 20:05:39 das Exp $ */
#ifndef _MATH_PRIVATE_H_#define _MATH_PRIVATE_H_
#include <sys/types.h>#include <machine/endian.h>
/* * 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. */
#if BYTE_ORDER == BIG_ENDIAN
typedef union{ double value; struct { u_int32_t msw; u_int32_t lsw; } parts;} ieee_double_shape_type;
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
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; /* FIXME: Assumes 32 bit int. */ unsigned int 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 * * We rename functions here to improve other sources' diffability * against fdlibm. */#define __ieee754_sqrt sqrt#define __ieee754_acos acos#define __ieee754_acosh acosh#define __ieee754_log log#define __ieee754_atanh atanh#define __ieee754_asin asin#define __ieee754_atan2 atan2#define __ieee754_exp exp#define __ieee754_cosh cosh#define __ieee754_fmod fmod#define __ieee754_pow pow#define __ieee754_lgamma lgamma#define __ieee754_gamma gamma#define __ieee754_lgamma_r lgamma_r#define __ieee754_gamma_r gamma_r#define __ieee754_log10 log10#define __ieee754_sinh sinh#define __ieee754_hypot hypot#define __ieee754_j0 j0#define __ieee754_j1 j1#define __ieee754_y0 y0#define __ieee754_y1 y1#define __ieee754_jn jn#define __ieee754_yn yn#define __ieee754_remainder remainder#define __ieee754_scalb scalb#define __ieee754_sqrtf sqrtf#define __ieee754_acosf acosf#define __ieee754_acoshf acoshf#define __ieee754_logf logf#define __ieee754_atanhf atanhf#define __ieee754_asinf asinf#define __ieee754_atan2f atan2f#define __ieee754_expf expf#define __ieee754_coshf coshf#define __ieee754_fmodf fmodf#define __ieee754_powf powf#define __ieee754_lgammaf lgammaf#define __ieee754_gammaf gammaf#define __ieee754_lgammaf_r lgammaf_r#define __ieee754_gammaf_r gammaf_r#define __ieee754_log10f log10f#define __ieee754_sinhf sinhf#define __ieee754_hypotf hypotf#define __ieee754_j0f j0f#define __ieee754_j1f j1f#define __ieee754_y0f y0f#define __ieee754_y1f y1f#define __ieee754_jnf jnf#define __ieee754_ynf ynf#define __ieee754_remainderf remainderf#define __ieee754_scalbf scalbf
#endif /* !_MATH_PRIVATE_H_ */