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/* |
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* fpu/flags.h - Floating-point flags |
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* |
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* Basilisk II (C) 1997-2008 Christian Bauer |
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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 1999-2000 Lauri Pesonen |
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* New framework, copyright 2000 Gwenole Beauchesne |
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* Adapted for JIT compilation (c) Bernd Meyer, 2000 |
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* |
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* This program 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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* This program 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 this program; 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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|
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#ifndef FPU_FLAGS_H |
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#define FPU_FLAGS_H |
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|
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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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|
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#undef PRIVATE |
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#define PRIVATE static |
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|
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#undef FFPU |
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#define FFPU /**/ |
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|
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#undef FPU |
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#define FPU fpu. |
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|
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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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/* -------------------------------------------------------------------------- */ |
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/* --- Selection of floating-point flags handling mode --- */ |
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/* -------------------------------------------------------------------------- */ |
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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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|
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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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|
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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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|
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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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|
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#ifdef FPU_IMPLEMENTATION |
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|
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/* -------------------------------------------------------------------------- */ |
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/* --- Native X86 Floating-Point Flags --- */ |
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/* -------------------------------------------------------------------------- */ |
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|
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/* FPU_X86 has its own set of lookup functions */ |
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|
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#ifdef FPU_USE_X86_FLAGS |
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|
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#define FPU_USE_NATIVE_FLAGS |
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|
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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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|
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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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|
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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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|
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/* Initialization */ |
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PUBLIC void FFPU fpu_init_native_fflags(void); |
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|
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#ifdef FPU_UAE |
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|
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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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|
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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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|
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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" : "=r" (sw) : "f" (r)); FPU fpsr.condition_codes = sw; } |
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|
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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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|
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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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|
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#endif /* FPU_UAE */ |
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|
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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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|
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#endif /* FPU_X86_USE_NATIVE_FLAGS */ |
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|
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/* -------------------------------------------------------------------------- */ |
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/* --- Use Original M68K FPU Mappings --- */ |
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/* -------------------------------------------------------------------------- */ |
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|
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#ifdef FPU_USE_GENERIC_FLAGS |
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|
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#undef FPU_USE_NATIVE_FLAGS |
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|
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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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|
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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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|
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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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|
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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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|
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#endif /* FPU_USE_GENERIC_FLAGS */ |
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|
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/* -------------------------------------------------------------------------- */ |
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/* --- Use Lazy Flags Evaluation --- */ |
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/* -------------------------------------------------------------------------- */ |
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|
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#ifdef FPU_USE_LAZY_FLAGS |
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|
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#undef FPU_USE_NATIVE_FLAGS |
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|
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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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|
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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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|
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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 (FPU result == 0.0) |
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fpccr |= FPSR_CCB_ZERO; |
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else if (FPU result < 0.0) |
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fpccr |= FPSR_CCB_NEGATIVE; |
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if (isinf(FPU result)) |
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fpccr |= FPSR_CCB_INFINITY; |
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return fpccr; |
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} |
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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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if (new_fpcond & FPSR_CCB_NAN) |
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make_nan(FPU result); |
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else if (new_fpcond & FPSR_CCB_ZERO) |
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FPU result = 0.0; |
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else if (new_fpcond & FPSR_CCB_NEGATIVE) |
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FPU result = -1.0; |
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else |
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FPU result = +1.0; |
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/* gb-- where is Infinity ? */ |
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} |
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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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|
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#endif /* FPU_USE_LAZY_FLAGS */ |
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|
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#endif |
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|
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/* -------------------------------------------------------------------------- */ |
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/* --- Common methods --- */ |
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/* -------------------------------------------------------------------------- */ |
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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 * const FFPU address_of_fpccr(void) |
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{ return ((uae_u32 *)& FPU fpsr.condition_codes); } |
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|
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#endif /* FPU_FLAGS_H */ |
