| 1 |
/* |
| 2 |
* fpu/flags.h - Floating-point flags |
| 3 |
* |
| 4 |
* Basilisk II (C) 1997-2004 Christian Bauer |
| 5 |
* |
| 6 |
* MC68881/68040 fpu emulation |
| 7 |
* |
| 8 |
* Original UAE FPU, copyright 1996 Herman ten Brugge |
| 9 |
* Rewrite for x86, copyright 1999-2000 Lauri Pesonen |
| 10 |
* New framework, copyright 2000 Gwenole Beauchesne |
| 11 |
* Adapted for JIT compilation (c) Bernd Meyer, 2000 |
| 12 |
* |
| 13 |
* This program is free software; you can redistribute it and/or modify |
| 14 |
* it under the terms of the GNU General Public License as published by |
| 15 |
* the Free Software Foundation; either version 2 of the License, or |
| 16 |
* (at your option) any later version. |
| 17 |
* |
| 18 |
* This program is distributed in the hope that it will be useful, |
| 19 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 |
* GNU General Public License for more details. |
| 22 |
* |
| 23 |
* You should have received a copy of the GNU General Public License |
| 24 |
* along with this program; if not, write to the Free Software |
| 25 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 26 |
*/ |
| 27 |
|
| 28 |
#ifndef FPU_FLAGS_H |
| 29 |
#define FPU_FLAGS_H |
| 30 |
|
| 31 |
/* NOTE: this file shall be included only from fpu/fpu_*.cpp */ |
| 32 |
#undef PUBLIC |
| 33 |
#define PUBLIC extern |
| 34 |
|
| 35 |
#undef PRIVATE |
| 36 |
#define PRIVATE static |
| 37 |
|
| 38 |
#undef FFPU |
| 39 |
#define FFPU /**/ |
| 40 |
|
| 41 |
#undef FPU |
| 42 |
#define FPU fpu. |
| 43 |
|
| 44 |
/* Defaults to generic flags */ |
| 45 |
#define FPU_USE_GENERIC_FLAGS |
| 46 |
|
| 47 |
/* -------------------------------------------------------------------------- */ |
| 48 |
/* --- Selection of floating-point flags handling mode --- */ |
| 49 |
/* -------------------------------------------------------------------------- */ |
| 50 |
|
| 51 |
/* Optimized i386 fpu core must use native flags */ |
| 52 |
#if defined(FPU_X86) && defined(USE_X87_ASSEMBLY) |
| 53 |
# undef FPU_USE_GENERIC_FLAGS |
| 54 |
# define FPU_USE_X86_FLAGS |
| 55 |
#endif |
| 56 |
|
| 57 |
/* Old UAE FPU core can use native flags */ |
| 58 |
#if defined(FPU_UAE) && defined(USE_X87_ASSEMBLY) |
| 59 |
# undef FPU_USE_GENERIC_FLAGS |
| 60 |
# define FPU_USE_X86_FLAGS |
| 61 |
#endif |
| 62 |
|
| 63 |
/* IEEE-based implementation must use lazy flag evaluation */ |
| 64 |
#if defined(FPU_IEEE) |
| 65 |
# undef FPU_USE_GENERIC_FLAGS |
| 66 |
# define FPU_USE_LAZY_FLAGS |
| 67 |
#endif |
| 68 |
|
| 69 |
/* JIT Compilation for FPU only works with lazy evaluation of FPU flags */ |
| 70 |
#if defined(FPU_IEEE) && defined(USE_X87_ASSEMBLY) && defined(USE_JIT_FPU) |
| 71 |
# undef FPU_USE_GENERIC_FLAGS |
| 72 |
# define FPU_USE_LAZY_FLAGS |
| 73 |
#endif |
| 74 |
|
| 75 |
#ifdef FPU_IMPLEMENTATION |
| 76 |
|
| 77 |
/* -------------------------------------------------------------------------- */ |
| 78 |
/* --- Native X86 Floating-Point Flags --- */ |
| 79 |
/* -------------------------------------------------------------------------- */ |
| 80 |
|
| 81 |
/* FPU_X86 has its own set of lookup functions */ |
| 82 |
|
| 83 |
#ifdef FPU_USE_X86_FLAGS |
| 84 |
|
| 85 |
#define FPU_USE_NATIVE_FLAGS |
| 86 |
|
| 87 |
#define NATIVE_FFLAG_NEGATIVE 0x0200 |
| 88 |
#define NATIVE_FFLAG_ZERO 0x4000 |
| 89 |
#define NATIVE_FFLAG_INFINITY 0x0500 |
| 90 |
#define NATIVE_FFLAG_NAN 0x0100 |
| 91 |
|
| 92 |
/* Translation tables between native and m68k floating-point flags */ |
| 93 |
PRIVATE uae_u32 to_m68k_fpcond[0x48]; |
| 94 |
PRIVATE uae_u32 to_host_fpcond[0x10]; |
| 95 |
|
| 96 |
/* Truth table for floating-point condition codes */ |
| 97 |
PRIVATE uae_u32 fpcond_truth_table[32][8]; // 32 m68k conditions x 8 host condition codes |
| 98 |
|
| 99 |
/* Initialization */ |
| 100 |
PUBLIC void FFPU fpu_init_native_fflags(void); |
| 101 |
|
| 102 |
#ifdef FPU_UAE |
| 103 |
|
| 104 |
/* Native to m68k floating-point condition codes */ |
| 105 |
PRIVATE inline uae_u32 FFPU get_fpccr(void) |
| 106 |
{ return to_m68k_fpcond[(FPU fpsr.condition_codes >> 8) & 0x47]; } |
| 107 |
|
| 108 |
/* M68k to native floating-point condition codes */ |
| 109 |
PRIVATE inline void FFPU set_fpccr(uae_u32 new_fpcond) |
| 110 |
/* Precondition: new_fpcond is only valid for floating-point condition codes */ |
| 111 |
{ FPU fpsr.condition_codes = to_host_fpcond[new_fpcond >> 24]; } |
| 112 |
|
| 113 |
/* Make FPSR according to the value passed in argument */ |
| 114 |
PRIVATE inline void FFPU make_fpsr(fpu_register const & r) |
| 115 |
{ uae_u16 sw; __asm__ __volatile__ ("fxam\n\tfnstsw %0" : "=r" (sw) : "f" (r)); FPU fpsr.condition_codes = sw; } |
| 116 |
|
| 117 |
/* Return the corresponding ID of the current floating-point condition codes */ |
| 118 |
/* NOTE: only valid for evaluation of a condition */ |
| 119 |
PRIVATE inline int FFPU host_fpcond_id(void) |
| 120 |
{ return ((FPU fpsr.condition_codes >> 12) & 4) | ((FPU fpsr.condition_codes >> 8) & 3); } |
| 121 |
|
| 122 |
/* Return true if the floating-point condition is satisfied */ |
| 123 |
PRIVATE inline bool FFPU fpcctrue(int condition) |
| 124 |
{ return fpcond_truth_table[condition][host_fpcond_id()]; } |
| 125 |
|
| 126 |
#endif /* FPU_UAE */ |
| 127 |
|
| 128 |
/* Return the address of the floating-point condition codes truth table */ |
| 129 |
static inline uae_u8 * const FFPU address_of_fpcond_truth_table(void) |
| 130 |
{ return ((uae_u8*)&fpcond_truth_table[0][0]); } |
| 131 |
|
| 132 |
#endif /* FPU_X86_USE_NATIVE_FLAGS */ |
| 133 |
|
| 134 |
/* -------------------------------------------------------------------------- */ |
| 135 |
/* --- Use Original M68K FPU Mappings --- */ |
| 136 |
/* -------------------------------------------------------------------------- */ |
| 137 |
|
| 138 |
#ifdef FPU_USE_GENERIC_FLAGS |
| 139 |
|
| 140 |
#undef FPU_USE_NATIVE_FLAGS |
| 141 |
|
| 142 |
#define NATIVE_FFLAG_NEGATIVE 0x08000000 |
| 143 |
#define NATIVE_FFLAG_ZERO 0x04000000 |
| 144 |
#define NATIVE_FFLAG_INFINITY 0x02000000 |
| 145 |
#define NATIVE_FFLAG_NAN 0x01000000 |
| 146 |
|
| 147 |
/* Initialization - NONE */ |
| 148 |
PRIVATE inline void FFPU fpu_init_native_fflags(void) |
| 149 |
{ } |
| 150 |
|
| 151 |
/* Native to m68k floating-point condition codes - SELF */ |
| 152 |
PRIVATE inline uae_u32 FFPU get_fpccr(void) |
| 153 |
{ return FPU fpsr.condition_codes; } |
| 154 |
|
| 155 |
/* M68k to native floating-point condition codes - SELF */ |
| 156 |
PRIVATE inline void FFPU set_fpccr(uae_u32 new_fpcond) |
| 157 |
{ FPU fpsr.condition_codes = new_fpcond; } |
| 158 |
|
| 159 |
#endif /* FPU_USE_GENERIC_FLAGS */ |
| 160 |
|
| 161 |
/* -------------------------------------------------------------------------- */ |
| 162 |
/* --- Use Lazy Flags Evaluation --- */ |
| 163 |
/* -------------------------------------------------------------------------- */ |
| 164 |
|
| 165 |
#ifdef FPU_USE_LAZY_FLAGS |
| 166 |
|
| 167 |
#undef FPU_USE_NATIVE_FLAGS |
| 168 |
|
| 169 |
#define NATIVE_FFLAG_NEGATIVE 0x08000000 |
| 170 |
#define NATIVE_FFLAG_ZERO 0x04000000 |
| 171 |
#define NATIVE_FFLAG_INFINITY 0x02000000 |
| 172 |
#define NATIVE_FFLAG_NAN 0x01000000 |
| 173 |
|
| 174 |
/* Initialization - NONE */ |
| 175 |
PRIVATE inline void FFPU fpu_init_native_fflags(void) |
| 176 |
{ } |
| 177 |
|
| 178 |
/* Native to m68k floating-point condition codes - SELF */ |
| 179 |
PRIVATE inline uae_u32 FFPU get_fpccr(void) |
| 180 |
{ |
| 181 |
uae_u32 fpccr = 0; |
| 182 |
if (isnan(FPU result)) |
| 183 |
fpccr |= FPSR_CCB_NAN; |
| 184 |
else if (FPU result == 0.0) |
| 185 |
fpccr |= FPSR_CCB_ZERO; |
| 186 |
else if (FPU result < 0.0) |
| 187 |
fpccr |= FPSR_CCB_NEGATIVE; |
| 188 |
if (isinf(FPU result)) |
| 189 |
fpccr |= FPSR_CCB_INFINITY; |
| 190 |
return fpccr; |
| 191 |
} |
| 192 |
|
| 193 |
/* M68k to native floating-point condition codes - SELF */ |
| 194 |
PRIVATE inline void FFPU set_fpccr(uae_u32 new_fpcond) |
| 195 |
{ |
| 196 |
if (new_fpcond & FPSR_CCB_NAN) |
| 197 |
make_nan(FPU result); |
| 198 |
else if (new_fpcond & FPSR_CCB_ZERO) |
| 199 |
FPU result = 0.0; |
| 200 |
else if (new_fpcond & FPSR_CCB_NEGATIVE) |
| 201 |
FPU result = -1.0; |
| 202 |
else |
| 203 |
FPU result = +1.0; |
| 204 |
/* gb-- where is Infinity ? */ |
| 205 |
} |
| 206 |
|
| 207 |
/* Make FPSR according to the value passed in argument */ |
| 208 |
PRIVATE inline void FFPU make_fpsr(fpu_register const & r) |
| 209 |
{ FPU result = r; } |
| 210 |
|
| 211 |
#endif /* FPU_USE_LAZY_FLAGS */ |
| 212 |
|
| 213 |
#endif |
| 214 |
|
| 215 |
/* -------------------------------------------------------------------------- */ |
| 216 |
/* --- Common methods --- */ |
| 217 |
/* -------------------------------------------------------------------------- */ |
| 218 |
|
| 219 |
/* Return the address of the floating-point condition codes register */ |
| 220 |
static inline uae_u32 * const FFPU address_of_fpccr(void) |
| 221 |
{ return ((uae_u32 *)& FPU fpsr.condition_codes); } |
| 222 |
|
| 223 |
#endif /* FPU_FLAGS_H */ |
