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sfp-machine_32.h
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1 /* Machine-dependent software floating-point definitions.
2  Sparc userland (_Q_*) version.
3  Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
4  This file is part of the GNU C Library.
5  Contributed by Richard Henderson ([email protected]),
6  Jakub Jelinek ([email protected]),
7  David S. Miller ([email protected]) and
8  Peter Maydell ([email protected]).
9 
10  The GNU C Library is free software; you can redistribute it and/or
11  modify it under the terms of the GNU Library General Public License as
12  published by the Free Software Foundation; either version 2 of the
13  License, or (at your option) any later version.
14 
15  The GNU C Library is distributed in the hope that it will be useful,
16  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  Library General Public License for more details.
19 
20  You should have received a copy of the GNU Library General Public
21  License along with the GNU C Library; see the file COPYING.LIB. If
22  not, write to the Free Software Foundation, Inc.,
23  59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24 
25 #ifndef _SFP_MACHINE_H
26 #define _SFP_MACHINE_H
27 
28 
29 #define _FP_W_TYPE_SIZE 32
30 #define _FP_W_TYPE unsigned long
31 #define _FP_WS_TYPE signed long
32 #define _FP_I_TYPE long
33 
34 #define _FP_MUL_MEAT_S(R,X,Y) \
35  _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
36 #define _FP_MUL_MEAT_D(R,X,Y) \
37  _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
38 #define _FP_MUL_MEAT_Q(R,X,Y) \
39  _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
40 
41 #define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_udiv(S,R,X,Y)
42 #define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_2_udiv(D,R,X,Y)
43 #define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
44 
45 #define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
46 #define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1
47 #define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
48 #define _FP_NANSIGN_S 0
49 #define _FP_NANSIGN_D 0
50 #define _FP_NANSIGN_Q 0
51 
52 #define _FP_KEEPNANFRACP 1
53 
54 /* If one NaN is signaling and the other is not,
55  * we choose that one, otherwise we choose X.
56  */
57 /* For _Qp_* and _Q_*, this should prefer X, for
58  * CPU instruction emulation this should prefer Y.
59  * (see SPAMv9 B.2.2 section).
60  */
61 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
62  do { \
63  if ((_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs) \
64  && !(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs)) \
65  { \
66  R##_s = X##_s; \
67  _FP_FRAC_COPY_##wc(R,X); \
68  } \
69  else \
70  { \
71  R##_s = Y##_s; \
72  _FP_FRAC_COPY_##wc(R,Y); \
73  } \
74  R##_c = FP_CLS_NAN; \
75  } while (0)
76 
77 /* Some assembly to speed things up. */
78 #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) \
79  __asm__ ("addcc %r7,%8,%2\n\t" \
80  "addxcc %r5,%6,%1\n\t" \
81  "addx %r3,%4,%0\n" \
82  : "=r" ((USItype)(r2)), \
83  "=&r" ((USItype)(r1)), \
84  "=&r" ((USItype)(r0)) \
85  : "%rJ" ((USItype)(x2)), \
86  "rI" ((USItype)(y2)), \
87  "%rJ" ((USItype)(x1)), \
88  "rI" ((USItype)(y1)), \
89  "%rJ" ((USItype)(x0)), \
90  "rI" ((USItype)(y0)) \
91  : "cc")
92 
93 #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) \
94  __asm__ ("subcc %r7,%8,%2\n\t" \
95  "subxcc %r5,%6,%1\n\t" \
96  "subx %r3,%4,%0\n" \
97  : "=r" ((USItype)(r2)), \
98  "=&r" ((USItype)(r1)), \
99  "=&r" ((USItype)(r0)) \
100  : "%rJ" ((USItype)(x2)), \
101  "rI" ((USItype)(y2)), \
102  "%rJ" ((USItype)(x1)), \
103  "rI" ((USItype)(y1)), \
104  "%rJ" ((USItype)(x0)), \
105  "rI" ((USItype)(y0)) \
106  : "cc")
107 
108 #define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0) \
109  do { \
110  /* We need to fool gcc, as we need to pass more than 10 \
111  input/outputs. */ \
112  register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2"); \
113  __asm__ __volatile__ ( \
114  "addcc %r8,%9,%1\n\t" \
115  "addxcc %r6,%7,%0\n\t" \
116  "addxcc %r4,%5,%%g2\n\t" \
117  "addx %r2,%3,%%g1\n\t" \
118  : "=&r" ((USItype)(r1)), \
119  "=&r" ((USItype)(r0)) \
120  : "%rJ" ((USItype)(x3)), \
121  "rI" ((USItype)(y3)), \
122  "%rJ" ((USItype)(x2)), \
123  "rI" ((USItype)(y2)), \
124  "%rJ" ((USItype)(x1)), \
125  "rI" ((USItype)(y1)), \
126  "%rJ" ((USItype)(x0)), \
127  "rI" ((USItype)(y0)) \
128  : "cc", "g1", "g2"); \
129  __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2)); \
130  r3 = _t1; r2 = _t2; \
131  } while (0)
132 
133 #define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0) \
134  do { \
135  /* We need to fool gcc, as we need to pass more than 10 \
136  input/outputs. */ \
137  register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2"); \
138  __asm__ __volatile__ ( \
139  "subcc %r8,%9,%1\n\t" \
140  "subxcc %r6,%7,%0\n\t" \
141  "subxcc %r4,%5,%%g2\n\t" \
142  "subx %r2,%3,%%g1\n\t" \
143  : "=&r" ((USItype)(r1)), \
144  "=&r" ((USItype)(r0)) \
145  : "%rJ" ((USItype)(x3)), \
146  "rI" ((USItype)(y3)), \
147  "%rJ" ((USItype)(x2)), \
148  "rI" ((USItype)(y2)), \
149  "%rJ" ((USItype)(x1)), \
150  "rI" ((USItype)(y1)), \
151  "%rJ" ((USItype)(x0)), \
152  "rI" ((USItype)(y0)) \
153  : "cc", "g1", "g2"); \
154  __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2)); \
155  r3 = _t1; r2 = _t2; \
156  } while (0)
157 
158 #define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
159 
160 #define __FP_FRAC_DEC_4(x3,x2,x1,x0,y3,y2,y1,y0) __FP_FRAC_SUB_4(x3,x2,x1,x0,x3,x2,x1,x0,y3,y2,y1,y0)
161 
162 #define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i) \
163  __asm__ ("addcc %3,%4,%3\n\t" \
164  "addxcc %2,%%g0,%2\n\t" \
165  "addxcc %1,%%g0,%1\n\t" \
166  "addx %0,%%g0,%0\n\t" \
167  : "=&r" ((USItype)(x3)), \
168  "=&r" ((USItype)(x2)), \
169  "=&r" ((USItype)(x1)), \
170  "=&r" ((USItype)(x0)) \
171  : "rI" ((USItype)(i)), \
172  "0" ((USItype)(x3)), \
173  "1" ((USItype)(x2)), \
174  "2" ((USItype)(x1)), \
175  "3" ((USItype)(x0)) \
176  : "cc")
177 
178 #ifndef CONFIG_SMP
179 extern struct task_struct *last_task_used_math;
180 #endif
181 
182 /* Obtain the current rounding mode. */
183 #ifndef FP_ROUNDMODE
184 #ifdef CONFIG_SMP
185 #define FP_ROUNDMODE ((current->thread.fsr >> 30) & 0x3)
186 #else
187 #define FP_ROUNDMODE ((last_task_used_math->thread.fsr >> 30) & 0x3)
188 #endif
189 #endif
190 
191 /* Exception flags. */
192 #define FP_EX_INVALID (1 << 4)
193 #define FP_EX_OVERFLOW (1 << 3)
194 #define FP_EX_UNDERFLOW (1 << 2)
195 #define FP_EX_DIVZERO (1 << 1)
196 #define FP_EX_INEXACT (1 << 0)
197 
198 #define FP_HANDLE_EXCEPTIONS return _fex
199 
200 #ifdef CONFIG_SMP
201 #define FP_INHIBIT_RESULTS ((current->thread.fsr >> 23) & _fex)
202 #else
203 #define FP_INHIBIT_RESULTS ((last_task_used_math->thread.fsr >> 23) & _fex)
204 #endif
205 
206 #ifdef CONFIG_SMP
207 #define FP_TRAPPING_EXCEPTIONS ((current->thread.fsr >> 23) & 0x1f)
208 #else
209 #define FP_TRAPPING_EXCEPTIONS ((last_task_used_math->thread.fsr >> 23) & 0x1f)
210 #endif
211 
212 #endif
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