uae_cpu/fpu/flags.h

/*
 *  fpu/flags.h - Floating-point flags
 *
 *  Basilisk II (C) 1997-2004 Christian Bauer
 *
 *  MC68881/68040 fpu emulation
 *  
 *  Original UAE FPU, copyright 1996 Herman ten Brugge
 *  Rewrite for x86, copyright 1999-2000 Lauri Pesonen
 *  New framework, copyright 2000 Gwenole Beauchesne
 *  Adapted for JIT compilation (c) Bernd Meyer, 2000
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef FPU_FLAGS_H
#define FPU_FLAGS_H

/* NOTE: this file shall be included only from fpu/fpu_*.cpp */
#undef  PUBLIC
#define PUBLIC  extern

#undef  PRIVATE
#define PRIVATE static

#undef  FFPU
#define FFPU    /**/

#undef  FPU
#define FPU             fpu.

/* Defaults to generic flags */
#define FPU_USE_GENERIC_FLAGS

/* -------------------------------------------------------------------------- */
/* --- Selection of floating-point flags handling mode                    --- */
/* -------------------------------------------------------------------------- */

/* Optimized i386 fpu core must use native flags */
#if defined(FPU_X86) && defined(USE_X87_ASSEMBLY)
# undef FPU_USE_GENERIC_FLAGS
# define FPU_USE_X86_FLAGS
#endif

/* Old UAE FPU core can use native flags */
#if defined(FPU_UAE) && defined(USE_X87_ASSEMBLY)
# undef FPU_USE_GENERIC_FLAGS
# define FPU_USE_X86_FLAGS
#endif

/* IEEE-based implementation must use lazy flag evaluation */
#if defined(FPU_IEEE)
# undef FPU_USE_GENERIC_FLAGS
# define FPU_USE_LAZY_FLAGS
#endif

/* JIT Compilation for FPU only works with lazy evaluation of FPU flags */
#if defined(FPU_IEEE) && defined(USE_X87_ASSEMBLY) && defined(USE_JIT_FPU)
# undef FPU_USE_GENERIC_FLAGS
# define FPU_USE_LAZY_FLAGS
#endif

#ifdef FPU_IMPLEMENTATION

/* -------------------------------------------------------------------------- */
/* --- Native X86 Floating-Point Flags                                    --- */
/* -------------------------------------------------------------------------- */

/* FPU_X86 has its own set of lookup functions */

#ifdef FPU_USE_X86_FLAGS

#define FPU_USE_NATIVE_FLAGS

#define NATIVE_FFLAG_NEGATIVE   0x0200
#define NATIVE_FFLAG_ZERO               0x4000
#define NATIVE_FFLAG_INFINITY   0x0500
#define NATIVE_FFLAG_NAN                0x0100

/* Translation tables between native and m68k floating-point flags */
PRIVATE uae_u32 to_m68k_fpcond[0x48];
PRIVATE uae_u32 to_host_fpcond[0x10];

/* Truth table for floating-point condition codes */
PRIVATE uae_u32 fpcond_truth_table[32][8]; // 32 m68k conditions x 8 host condition codes

/* Initialization */
PUBLIC void FFPU fpu_init_native_fflags(void);

#ifdef FPU_UAE

/* Native to m68k floating-point condition codes */
PRIVATE inline uae_u32 FFPU get_fpccr(void)
        { return to_m68k_fpcond[(FPU fpsr.condition_codes >> 8) & 0x47]; }

/* M68k to native floating-point condition codes */
PRIVATE inline void FFPU set_fpccr(uae_u32 new_fpcond)
        /* Precondition: new_fpcond is only valid for floating-point condition codes */
        { FPU fpsr.condition_codes = to_host_fpcond[new_fpcond >> 24]; }

/* Make FPSR according to the value passed in argument */
PRIVATE inline void FFPU make_fpsr(fpu_register const & r)
        { uae_u16 sw; __asm__ __volatile__ ("fxam\n\tfnstsw %0" : "=r" (sw) : "f" (r)); FPU fpsr.condition_codes = sw; }

/* Return the corresponding ID of the current floating-point condition codes */
/* NOTE: only valid for evaluation of a condition */
PRIVATE inline int FFPU host_fpcond_id(void)
        { return ((FPU fpsr.condition_codes >> 12) & 4) | ((FPU fpsr.condition_codes >> 8) & 3); }

/* Return true if the floating-point condition is satisfied */
PRIVATE inline bool FFPU fpcctrue(int condition)
        { return fpcond_truth_table[condition][host_fpcond_id()]; }

#endif /* FPU_UAE */

/* Return the address of the floating-point condition codes truth table */
static inline uae_u8 * const FFPU address_of_fpcond_truth_table(void)
        { return ((uae_u8*)&fpcond_truth_table[0][0]); }

#endif /* FPU_X86_USE_NATIVE_FLAGS */

/* -------------------------------------------------------------------------- */
/* --- Use Original M68K FPU Mappings                                     --- */
/* -------------------------------------------------------------------------- */

#ifdef FPU_USE_GENERIC_FLAGS

#undef FPU_USE_NATIVE_FLAGS

#define NATIVE_FFLAG_NEGATIVE   0x08000000
#define NATIVE_FFLAG_ZERO               0x04000000
#define NATIVE_FFLAG_INFINITY   0x02000000
#define NATIVE_FFLAG_NAN                0x01000000

/* Initialization - NONE */
PRIVATE inline void FFPU fpu_init_native_fflags(void)
        { }

/* Native to m68k floating-point condition codes - SELF */
PRIVATE inline uae_u32 FFPU get_fpccr(void)
        { return FPU fpsr.condition_codes; }

/* M68k to native floating-point condition codes - SELF */
PRIVATE inline void FFPU set_fpccr(uae_u32 new_fpcond)
        { FPU fpsr.condition_codes = new_fpcond; }

#endif /* FPU_USE_GENERIC_FLAGS */

/* -------------------------------------------------------------------------- */
/* --- Use Lazy Flags Evaluation                                          --- */
/* -------------------------------------------------------------------------- */

#ifdef FPU_USE_LAZY_FLAGS

#undef FPU_USE_NATIVE_FLAGS

#define NATIVE_FFLAG_NEGATIVE   0x08000000
#define NATIVE_FFLAG_ZERO               0x04000000
#define NATIVE_FFLAG_INFINITY   0x02000000
#define NATIVE_FFLAG_NAN                0x01000000

/* Initialization - NONE */
PRIVATE inline void FFPU fpu_init_native_fflags(void)
        { }

/* Native to m68k floating-point condition codes - SELF */
PRIVATE inline uae_u32 FFPU get_fpccr(void)
{
        uae_u32 fpccr = 0;
        if (isnan(FPU result))
                fpccr |= FPSR_CCB_NAN;
        else if (FPU result == 0.0)
                fpccr |= FPSR_CCB_ZERO;
        else if (FPU result < 0.0)
                fpccr |= FPSR_CCB_NEGATIVE;
        if (isinf(FPU result))
                fpccr |= FPSR_CCB_INFINITY;
        return fpccr;
}

/* M68k to native floating-point condition codes - SELF */
PRIVATE inline void FFPU set_fpccr(uae_u32 new_fpcond)
{
        if (new_fpcond & FPSR_CCB_NAN)
                make_nan(FPU result);
        else if (new_fpcond & FPSR_CCB_ZERO)
                FPU result = 0.0;
        else if (new_fpcond & FPSR_CCB_NEGATIVE)
                FPU result = -1.0;
        else
                FPU result = +1.0;
        /* gb-- where is Infinity ? */
}

/* Make FPSR according to the value passed in argument */
PRIVATE inline void FFPU make_fpsr(fpu_register const & r)
        { FPU result = r; }

#endif /* FPU_USE_LAZY_FLAGS */

#endif

/* -------------------------------------------------------------------------- */
/* --- Common methods                                                     --- */
/* -------------------------------------------------------------------------- */

/* Return the address of the floating-point condition codes register */
static inline uae_u32 * const FFPU address_of_fpccr(void)
        { return ((uae_u32 *)& FPU fpsr.condition_codes); }

#endif /* FPU_FLAGS_H */
Revision:	1.4
Committed:	2004-01-12T15:29:31Z (20 years, 6 months ago) by cebix
Content type:	text/plain
Branch:	MAIN
CVS Tags:	nigel-build-16, nigel-build-15
Changes since 1.3:	+1 -1 lines
Log Message:	Happy New Year! :)
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* fpu/flags.h - Floating-point flags
3			*
4	cebix	1.4	* Basilisk II (C) 1997-2004 Christian Bauer
5	gbeauche	1.1	*
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	gbeauche	1.3	#if defined(FPU_X86) && defined(USE_X87_ASSEMBLY)
53	gbeauche	1.1	# undef FPU_USE_GENERIC_FLAGS
54			# define FPU_USE_X86_FLAGS
55			#endif
56
57			/* Old UAE FPU core can use native flags */
58	gbeauche	1.3	#if defined(FPU_UAE) && defined(USE_X87_ASSEMBLY)
59	gbeauche	1.1	# 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	gbeauche	1.3	#if defined(FPU_IEEE) && defined(USE_X87_ASSEMBLY) && defined(USE_JIT_FPU)
71	gbeauche	1.1	# 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	gbeauche	1.2	static inline uae_u8 * const FFPU address_of_fpcond_truth_table(void)
130	gbeauche	1.1	{ 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	gbeauche	1.2	static inline uae_u32 * const FFPU address_of_fpccr(void)
221	gbeauche	1.1	{ return ((uae_u32 *)& FPU fpsr.condition_codes); }
222
223			#endif /* FPU_FLAGS_H */