83 lines
2.9 KiB
C
Executable File
83 lines
2.9 KiB
C
Executable File
/*============================================================================
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This source file is an extension to the SoftFloat IEC/IEEE Floating-point
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Arithmetic Package, Release 2b, written for Bochs (x86 achitecture simulator)
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floating point emulation.
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THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
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been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
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RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
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AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
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COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
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EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
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INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
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OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
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Derivative works are acceptable, even for commercial purposes, so long as
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(1) the source code for the derivative work includes prominent notice that
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the work is derivative, and (2) the source code includes prominent notice with
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these four paragraphs for those parts of this code that are retained.
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=============================================================================*/
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#ifndef _FPU_CONSTANTS_H_
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#define _FPU_CONSTANTS_H_
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#include <config.h>
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// Pentium CPU uses only 68-bit precision M_PI approximation
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// #define BETTER_THAN_PENTIUM
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/*============================================================================
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* Written for Bochs (x86 achitecture simulator) by
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* Stanislav Shwartsman (stl at fidonet.org.il)
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* ==========================================================================*/
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//////////////////////////////
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// PI, PI/2, PI/4 constants
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//////////////////////////////
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#define FLOATX80_PI_EXP (0x4000)
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// 128-bit PI fraction
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#ifdef BETTER_THAN_PENTIUM
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#define FLOAT_PI_HI (BX_CONST64(0xc90fdaa22168c234))
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#define FLOAT_PI_LO (BX_CONST64(0xc4c6628b80dc1cd1))
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#else
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#define FLOAT_PI_HI (BX_CONST64(0xc90fdaa22168c234))
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#define FLOAT_PI_LO (BX_CONST64(0xC000000000000000))
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#endif
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#define FLOATX80_PI2_EXP (0x3FFF)
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#define FLOATX80_PI4_EXP (0x3FFE)
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//////////////////////////////
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// 3PI/4 constant
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//////////////////////////////
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#define FLOATX80_3PI4_EXP (0x4000)
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// 128-bit 3PI/4 fraction
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#ifdef BETTER_THAN_PENTIUM
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#define FLOAT_3PI4_HI (BX_CONST64(0x96cbe3f9990e91a7))
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#define FLOAT_3PI4_LO (BX_CONST64(0x9394c9e8a0a5159c))
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#else
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#define FLOAT_3PI4_HI (BX_CONST64(0x96cbe3f9990e91a7))
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#define FLOAT_3PI4_LO (BX_CONST64(0x9000000000000000))
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#endif
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//////////////////////////////
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// 1/LN2 constant
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//////////////////////////////
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#define FLOAT_LN2INV_EXP (0x3FFF)
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// 128-bit 1/LN2 fraction
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#ifdef BETTER_THAN_PENTIUM
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#define FLOAT_LN2INV_HI (BX_CONST64(0xb8aa3b295c17f0bb))
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#define FLOAT_LN2INV_LO (BX_CONST64(0xbe87fed0691d3e89))
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#else
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#define FLOAT_LN2INV_HI (BX_CONST64(0xb8aa3b295c17f0bb))
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#define FLOAT_LN2INV_LO (BX_CONST64(0xC000000000000000))
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#endif
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#endif
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