101 lines
4.7 KiB
C
101 lines
4.7 KiB
C
/*============================================================================
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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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/*============================================================================
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* Written for Bochs (x86 achitecture simulator) by
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* Stanislav Shwartsman [sshwarts at sourceforge net]
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* ==========================================================================*/
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#ifndef _SOFTFLOATX80_EXTENSIONS_H_
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#define _SOFTFLOATX80_EXTENSIONS_H_
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#include "softfloat.h"
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#include "softfloat-specialize.h"
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE integer-to-floating-point conversion routines.
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*----------------------------------------------------------------------------*/
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Bit16s floatx80_to_int16(floatx80, float_status_t &status);
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Bit16s floatx80_to_int16_round_to_zero(floatx80, float_status_t &status);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE extended double-precision operations.
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*----------------------------------------------------------------------------*/
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float_class_t floatx80_class(floatx80);
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floatx80 floatx80_extract(floatx80 &a, float_status_t &status);
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floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status_t &status);
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int floatx80_remainder(floatx80 a, floatx80 b, floatx80 &r, Bit64u &q, float_status_t &status);
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int floatx80_ieee754_remainder(floatx80 a, floatx80 b, floatx80 &r, Bit64u &q, float_status_t &status);
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floatx80 f2xm1(floatx80 a, float_status_t &status);
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floatx80 fyl2x(floatx80 a, floatx80 b, float_status_t &status);
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floatx80 fyl2xp1(floatx80 a, floatx80 b, float_status_t &status);
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floatx80 fpatan(floatx80 a, floatx80 b, float_status_t &status);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE extended double-precision trigonometric functions.
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*----------------------------------------------------------------------------*/
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int fsincos(floatx80 a, floatx80 *sin_a, floatx80 *cos_a, float_status_t &status);
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int fsin(floatx80 &a, float_status_t &status);
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int fcos(floatx80 &a, float_status_t &status);
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int ftan(floatx80 &a, float_status_t &status);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE extended double-precision compare.
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*----------------------------------------------------------------------------*/
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int floatx80_compare(floatx80, floatx80, float_status_t &status);
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int floatx80_compare_quiet(floatx80, floatx80, float_status_t &status);
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/*-----------------------------------------------------------------------------
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| Calculates the absolute value of the extended double-precision floating-point
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| value `a'. The operation is performed according to the IEC/IEEE Standard
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| for Binary Floating-Point Arithmetic.
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*----------------------------------------------------------------------------*/
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BX_CPP_INLINE floatx80& floatx80_abs(floatx80 ®)
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{
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reg.exp &= 0x7FFF;
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return reg;
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}
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/*-----------------------------------------------------------------------------
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| Changes the sign of the extended double-precision floating-point value 'a'.
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| The operation is performed according to the IEC/IEEE Standard for Binary
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| Floating-Point Arithmetic.
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*----------------------------------------------------------------------------*/
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BX_CPP_INLINE floatx80& floatx80_chs(floatx80 ®)
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{
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reg.exp ^= 0x8000;
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return reg;
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}
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/*-----------------------------------------------------------------------------
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| Commonly used extended double-precision floating-point constants.
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*----------------------------------------------------------------------------*/
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extern const floatx80 Const_Z;
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extern const floatx80 Const_1;
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#endif
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