68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
|
/*============================================================================
|
||
|
|
This source file is an extension to the SoftFloat IEC/IEEE Floating-point
|
||
|
|
Arithmetic Package, Release 2b, written for Bochs (x86 achitecture simulator)
|
||
|
|
floating point emulation.
|
||
|
|
|
||
|
|
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
|
||
|
|
been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
|
||
|
|
RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
|
||
|
|
AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
|
||
|
|
COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
|
||
|
|
EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
|
||
|
|
INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
|
||
|
|
OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
|
||
|
|
|
||
|
|
Derivative works are acceptable, even for commercial purposes, so long as
|
||
|
|
(1) the source code for the derivative work includes prominent notice that
|
||
|
|
the work is derivative, and (2) the source code includes prominent notice with
|
||
|
|
these four paragraphs for those parts of this code that are retained.
|
||
|
|
=============================================================================*/
|
||
|
|
|
||
|
|
#ifndef _FPU_CONSTANTS_H_
|
||
|
|
#define _FPU_CONSTANTS_H_
|
||
|
|
|
||
|
|
#include <config.h>
|
||
|
|
|
||
|
|
// Pentium CPU uses only 68-bit precision M_PI approximation
|
||
|
|
// #define BETTER_THAN_PENTIUM
|
||
|
|
|
||
|
|
/*============================================================================
|
||
|
|
* Written for Bochs (x86 achitecture simulator) by
|
||
|
|
* Stanislav Shwartsman (gate at fidonet.org.il)
|
||
|
|
* ==========================================================================*/
|
||
|
|
|
||
|
|
//////////////////////////////
|
||
|
|
// PI, PI/2, PI/4 constants
|
||
|
|
//////////////////////////////
|
||
|
|
|
||
|
|
#define FLOATX80_PI_EXP (0x4000)
|
||
|
|
|
||
|
|
// 128-bit PI fraction
|
||
|
|
#ifdef BETTER_THAN_PENTIUM
|
||
|
|
#define FLOAT_PI_HI (BX_CONST64(0xC90FDAA22168C234))
|
||
|
|
#define FLOAT_PI_LO (BX_CONST64(0xC4C6628B80DC1CD1))
|
||
|
|
#else
|
||
|
|
#define FLOAT_PI_HI (BX_CONST64(0xC90FDAA22168C234))
|
||
|
|
#define FLOAT_PI_LO (BX_CONST64(0xC000000000000000))
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define FLOATX80_PI2_EXP (0x3FFF)
|
||
|
|
#define FLOATX80_PI4_EXP (0x3FFE)
|
||
|
|
|
||
|
|
//////////////////////////////
|
||
|
|
// 3PI/4 constant
|
||
|
|
//////////////////////////////
|
||
|
|
|
||
|
|
#define FLOATX80_3PI4_EXP (0x4000)
|
||
|
|
|
||
|
|
// 128-bit 3PI/4 fraction
|
||
|
|
#ifdef BETTER_THAN_PENTIUM
|
||
|
|
#define FLOAT_3PI4_HI (BX_CONST64(0x96cbe3f9990e91a7))
|
||
|
|
#define FLOAT_3PI4_LO (BX_CONST64(0x9394C9E8A0A5159C))
|
||
|
|
#else
|
||
|
|
#define FLOAT_3PI4_HI (BX_CONST64(0x96cbe3f9990e91a7))
|
||
|
|
#define FLOAT_3PI4_LO (BX_CONST64(0x9000000000000000))
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|