mirror of
https://github.com/kanjitalk755/macemu.git
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229 lines
7.4 KiB
C
229 lines
7.4 KiB
C
/*
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* fpu/flags.h - Floating-point flags
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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_FLAGS_H
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#define FPU_FLAGS_H
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/* NOTE: this file shall be included only from fpu/fpu_*.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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/* Defaults to generic flags */
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#define FPU_USE_GENERIC_FLAGS
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/* -------------------------------------------------------------------------- */
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/* --- Selection of floating-point flags handling mode --- */
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/* -------------------------------------------------------------------------- */
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/* Optimized i386 fpu core must use native flags */
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#if defined(FPU_X86) && defined(USE_X87_ASSEMBLY)
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# undef FPU_USE_GENERIC_FLAGS
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# define FPU_USE_X86_FLAGS
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#endif
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/* Old UAE FPU core can use native flags */
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#if defined(FPU_UAE) && defined(USE_X87_ASSEMBLY)
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# undef FPU_USE_GENERIC_FLAGS
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# define FPU_USE_X86_FLAGS
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#endif
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/* IEEE-based implementation must use lazy flag evaluation */
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#if defined(FPU_IEEE)
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# undef FPU_USE_GENERIC_FLAGS
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# define FPU_USE_LAZY_FLAGS
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#endif
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/* JIT Compilation for FPU only works with lazy evaluation of FPU flags */
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#if defined(FPU_IEEE) && defined(USE_X87_ASSEMBLY) && defined(USE_JIT_FPU)
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# undef FPU_USE_GENERIC_FLAGS
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# define FPU_USE_LAZY_FLAGS
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#endif
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#ifdef FPU_IMPLEMENTATION
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/* -------------------------------------------------------------------------- */
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/* --- Native X86 Floating-Point Flags --- */
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/* -------------------------------------------------------------------------- */
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/* FPU_X86 has its own set of lookup functions */
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#ifdef FPU_USE_X86_FLAGS
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#define FPU_USE_NATIVE_FLAGS
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#define NATIVE_FFLAG_NEGATIVE 0x0200
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#define NATIVE_FFLAG_ZERO 0x4000
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#define NATIVE_FFLAG_INFINITY 0x0500
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#define NATIVE_FFLAG_NAN 0x0100
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/* Translation tables between native and m68k floating-point flags */
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PRIVATE uae_u32 to_m68k_fpcond[0x48];
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PRIVATE uae_u32 to_host_fpcond[0x10];
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/* Truth table for floating-point condition codes */
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PRIVATE uae_u32 fpcond_truth_table[32][8]; // 32 m68k conditions x 8 host condition codes
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/* Initialization */
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PUBLIC void FFPU fpu_init_native_fflags(void);
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#ifdef FPU_UAE
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/* Native to m68k floating-point condition codes */
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PRIVATE inline uae_u32 FFPU get_fpccr(void)
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{ return to_m68k_fpcond[(FPU fpsr.condition_codes >> 8) & 0x47]; }
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/* M68k to native floating-point condition codes */
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PRIVATE inline void FFPU set_fpccr(uae_u32 new_fpcond)
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/* Precondition: new_fpcond is only valid for floating-point condition codes */
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{ FPU fpsr.condition_codes = to_host_fpcond[new_fpcond >> 24]; }
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/* Make FPSR according to the value passed in argument */
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PRIVATE inline void FFPU make_fpsr(fpu_register const & r)
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{ uae_u16 sw; __asm__ __volatile__ ("fxam\n\tfnstsw %0" : "=a" (sw) : "f" (r)); FPU fpsr.condition_codes = sw; }
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/* Return the corresponding ID of the current floating-point condition codes */
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/* NOTE: only valid for evaluation of a condition */
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PRIVATE inline int FFPU host_fpcond_id(void)
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{ return ((FPU fpsr.condition_codes >> 12) & 4) | ((FPU fpsr.condition_codes >> 8) & 3); }
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/* Return true if the floating-point condition is satisfied */
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PRIVATE inline bool FFPU fpcctrue(int condition)
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{ return fpcond_truth_table[condition][host_fpcond_id()]; }
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#endif /* FPU_UAE */
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/* Return the address of the floating-point condition codes truth table */
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static inline uae_u8 * const FFPU address_of_fpcond_truth_table(void)
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{ return ((uae_u8*)&fpcond_truth_table[0][0]); }
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#endif /* FPU_X86_USE_NATIVE_FLAGS */
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/* -------------------------------------------------------------------------- */
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/* --- Use Original M68K FPU Mappings --- */
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/* -------------------------------------------------------------------------- */
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#ifdef FPU_USE_GENERIC_FLAGS
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#undef FPU_USE_NATIVE_FLAGS
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#define NATIVE_FFLAG_NEGATIVE 0x08000000
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#define NATIVE_FFLAG_ZERO 0x04000000
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#define NATIVE_FFLAG_INFINITY 0x02000000
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#define NATIVE_FFLAG_NAN 0x01000000
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/* Initialization - NONE */
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PRIVATE inline void FFPU fpu_init_native_fflags(void)
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{ }
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/* Native to m68k floating-point condition codes - SELF */
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PRIVATE inline uae_u32 FFPU get_fpccr(void)
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{ return FPU fpsr.condition_codes; }
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/* M68k to native floating-point condition codes - SELF */
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PRIVATE inline void FFPU set_fpccr(uae_u32 new_fpcond)
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{ FPU fpsr.condition_codes = new_fpcond; }
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#endif /* FPU_USE_GENERIC_FLAGS */
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/* -------------------------------------------------------------------------- */
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/* --- Use Lazy Flags Evaluation --- */
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/* -------------------------------------------------------------------------- */
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#ifdef FPU_USE_LAZY_FLAGS
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#undef FPU_USE_NATIVE_FLAGS
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#define NATIVE_FFLAG_NEGATIVE 0x08000000
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#define NATIVE_FFLAG_ZERO 0x04000000
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#define NATIVE_FFLAG_INFINITY 0x02000000
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#define NATIVE_FFLAG_NAN 0x01000000
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/* Initialization - NONE */
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PRIVATE inline void FFPU fpu_init_native_fflags(void)
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{ }
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/* Native to m68k floating-point condition codes - SELF */
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PRIVATE inline uae_u32 FFPU get_fpccr(void)
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{
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uae_u32 fpccr = 0;
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if (isnan(FPU result))
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fpccr |= FPSR_CCB_NAN;
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else if (isinf(FPU result))
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fpccr |= FPSR_CCB_INFINITY;
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else if (iszero(FPU result))
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fpccr |= FPSR_CCB_ZERO;
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if (isneg(FPU result))
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fpccr |= FPSR_CCB_NEGATIVE;
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return fpccr;
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}
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/* M68k to native floating-point condition codes - SELF */
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PRIVATE inline void FFPU set_fpccr(uae_u32 new_fpcond)
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{
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bool negative = (new_fpcond & FPSR_CCB_NEGATIVE) != 0;
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if (new_fpcond & FPSR_CCB_NAN)
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make_nan(FPU result, negative);
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else if (new_fpcond & FPSR_CCB_INFINITY)
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make_inf(FPU result, negative);
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else if (new_fpcond & FPSR_CCB_ZERO)
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make_zero(FPU result, negative);
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else
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FPU result = negative ? -1.0 : +1.0;
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}
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/* Make FPSR according to the value passed in argument */
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PRIVATE inline void FFPU make_fpsr(fpu_register const & r)
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{ FPU result = r; }
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#endif /* FPU_USE_LAZY_FLAGS */
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#endif
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/* -------------------------------------------------------------------------- */
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/* --- Common methods --- */
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/* -------------------------------------------------------------------------- */
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/* Return the address of the floating-point condition codes register */
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static inline uae_u32 * FFPU address_of_fpccr(void)
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{ return ((uae_u32 *)& FPU fpsr.condition_codes); }
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#endif /* FPU_FLAGS_H */
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