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153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/*
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* fpu/fpu_ieee.h - Extra Definitions for the IEEE FPU core
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*
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* Copyright (c) 2001-2004 Milan Jurik of ARAnyM dev team (see AUTHORS)
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*
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* Inspired by Christian Bauer's Basilisk II
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*
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* This file is part of the ARAnyM project which builds a new and powerful
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* TOS/FreeMiNT compatible virtual machine running on almost any hardware.
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*
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* MC68881/68040 fpu emulation
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*
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* Original UAE FPU, copyright 1996 Herman ten Brugge
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* Rewrite for x86, copyright 1999-2001 Lauri Pesonen
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* New framework, copyright 2000-2001 Gwenole Beauchesne
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* Adapted for JIT compilation (c) Bernd Meyer, 2000-2001
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*
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* ARAnyM is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* ARAnyM is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with ARAnyM; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef FPU_IEEE_H
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#define FPU_IEEE_H
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/* NOTE: this file shall be included from fpu/fpu_uae.cpp */
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#undef PUBLIC
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#define PUBLIC extern
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#undef PRIVATE
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#define PRIVATE static
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#undef FFPU
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#define FFPU /**/
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#undef FPU
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#define FPU fpu.
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// Lauri-- full words to avoid partial register stalls.
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struct double_flags {
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uae_u32 in_range;
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uae_u32 zero;
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uae_u32 infinity;
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uae_u32 nan;
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uae_u32 negative;
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};
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PRIVATE double_flags fl_source;
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PRIVATE double_flags fl_dest;
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PRIVATE inline void FFPU get_dest_flags(fpu_register const & r);
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PRIVATE inline void FFPU get_source_flags(fpu_register const & r);
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PRIVATE inline void FFPU make_nan(fpu_register & r, bool negative);
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PRIVATE inline void FFPU make_zero(fpu_register & r, bool negative);
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PRIVATE inline void FFPU make_inf(fpu_register & r, bool negative);
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// MJ PRIVATE inline void FFPU fast_scale(fpu_register & r, int add);
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PRIVATE inline fpu_register FFPU fast_fgetexp(fpu_register const & r);
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// May be optimized for particular processors
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#ifndef FPU_USE_NATIVE_FLAGS
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PRIVATE inline void FFPU make_fpsr(fpu_register const & r);
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#endif
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// Normalize to range 1..2
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PRIVATE inline void FFPU fast_remove_exponent(fpu_register & r);
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// The sign of the quotient is the exclusive-OR of the sign bits
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// of the source and destination operands.
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PRIVATE inline uae_u32 FFPU get_quotient_sign(
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fpu_register const & ra, fpu_register const & rb
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);
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// Quotient Byte is loaded with the sign and least significant
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// seven bits of the quotient.
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PRIVATE inline void FFPU make_quotient(
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fpu_register const & quotient, uae_u32 sign
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);
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// to_single
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PRIVATE inline fpu_register FFPU make_single(
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uae_u32 value
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);
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// from_single
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PRIVATE inline uae_u32 FFPU extract_single(
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fpu_register const & src
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);
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// to_exten
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PRIVATE inline fpu_register FFPU make_extended(
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uae_u32 wrd1, uae_u32 wrd2, uae_u32 wrd3
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);
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/*
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Would be so much easier with full size floats :(
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... this is so vague.
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*/
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// to_exten_no_normalize
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PRIVATE inline void FFPU make_extended_no_normalize(
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uae_u32 wrd1, uae_u32 wrd2, uae_u32 wrd3, fpu_register & result
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);
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// from_exten
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PRIVATE inline void FFPU extract_extended(fpu_register const & src,
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uae_u32 * wrd1, uae_u32 * wrd2, uae_u32 * wrd3
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);
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// to_double
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PRIVATE inline fpu_register FFPU make_double(
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uae_u32 wrd1, uae_u32 wrd2
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);
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// from_double
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PRIVATE inline void FFPU extract_double(fpu_register const & src,
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uae_u32 * wrd1, uae_u32 * wrd2
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);
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PRIVATE inline fpu_register FFPU make_packed(
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uae_u32 wrd1, uae_u32 wrd2, uae_u32 wrd3
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);
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PRIVATE inline void FFPU extract_packed(
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fpu_register const & src, uae_u32 * wrd1, uae_u32 * wrd2, uae_u32 * wrd3
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);
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PRIVATE inline int FFPU get_fp_value(
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uae_u32 opcode, uae_u16 extra, fpu_register & src
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);
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PRIVATE inline int FFPU put_fp_value(
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uae_u32 opcode, uae_u16 extra, fpu_register const & value
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);
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PRIVATE inline int FFPU get_fp_ad(
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uae_u32 opcode, uae_u32 * ad
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);
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PRIVATE inline int FFPU fpp_cond(
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int condition
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);
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#endif /* FPU_IEEE_H */
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