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 (rth@cygnus.com),
6 Jakub Jelinek (jj@ultra.linux.cz),
7 David S. Miller (davem@redhat.com) and
8 Peter Maydell (pmaydell@chiark.greenend.org.uk).
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 #include <linux/config.h>
29
30 #define _FP_W_TYPE_SIZE 32
31 #define _FP_W_TYPE unsigned long
32 #define _FP_WS_TYPE signed long
33 #define _FP_I_TYPE long
34
35 #define _FP_MUL_MEAT_S(R,X,Y) \
36 _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
37 #define _FP_MUL_MEAT_D(R,X,Y) \
38 _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
39 #define _FP_MUL_MEAT_Q(R,X,Y) \
40 _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
41
42 #define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_udiv(S,R,X,Y)
43 #define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_2_udiv(D,R,X,Y)
44 #define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
45
46 #define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
47 #define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1
48 #define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
49 #define _FP_NANSIGN_S 0
50 #define _FP_NANSIGN_D 0
51 #define _FP_NANSIGN_Q 0
52
53 #define _FP_KEEPNANFRACP 1
54
55 /* If one NaN is signaling and the other is not,
56 * we choose that one, otherwise we choose X.
57 */
58 /* For _Qp_* and _Q_*, this should prefer X, for
59 * CPU instruction emulation this should prefer Y.
60 * (see SPAMv9 B.2.2 section).
61 */
62 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
63 do { \
64 if ((_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs) \
65 && !(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs)) \
66 { \
67 R##_s = X##_s; \
68 _FP_FRAC_COPY_##wc(R,X); \
69 } \
70 else \
71 { \
72 R##_s = Y##_s; \
73 _FP_FRAC_COPY_##wc(R,Y); \
74 } \
75 R##_c = FP_CLS_NAN; \
76 } while (0)
77
78 /* Some assembly to speed things up. */
79 #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) \
80 __asm__ ("addcc %r7,%8,%2
81 addxcc %r5,%6,%1
82 addx %r3,%4,%0" \
83 : "=r" ((USItype)(r2)), \
84 "=&r" ((USItype)(r1)), \
85 "=&r" ((USItype)(r0)) \
86 : "%rJ" ((USItype)(x2)), \
87 "rI" ((USItype)(y2)), \
88 "%rJ" ((USItype)(x1)), \
89 "rI" ((USItype)(y1)), \
90 "%rJ" ((USItype)(x0)), \
91 "rI" ((USItype)(y0)) \
92 : "cc")
93
94 #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) \
95 __asm__ ("subcc %r7,%8,%2
96 subxcc %r5,%6,%1
97 subx %r3,%4,%0" \
98 : "=r" ((USItype)(r2)), \
99 "=&r" ((USItype)(r1)), \
100 "=&r" ((USItype)(r0)) \
101 : "%rJ" ((USItype)(x2)), \
102 "rI" ((USItype)(y2)), \
103 "%rJ" ((USItype)(x1)), \
104 "rI" ((USItype)(y1)), \
105 "%rJ" ((USItype)(x0)), \
106 "rI" ((USItype)(y0)) \
107 : "cc")
108
109 #define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0) \
110 do { \
111 /* We need to fool gcc, as we need to pass more than 10 \
112 input/outputs. */ \
113 register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2"); \
114 __asm__ __volatile__ ("
115 addcc %r8,%9,%1
116 addxcc %r6,%7,%0
117 addxcc %r4,%5,%%g2
118 addx %r2,%3,%%g1" \
119 : "=&r" ((USItype)(r1)), \
120 "=&r" ((USItype)(r0)) \
121 : "%rJ" ((USItype)(x3)), \
122 "rI" ((USItype)(y3)), \
123 "%rJ" ((USItype)(x2)), \
124 "rI" ((USItype)(y2)), \
125 "%rJ" ((USItype)(x1)), \
126 "rI" ((USItype)(y1)), \
127 "%rJ" ((USItype)(x0)), \
128 "rI" ((USItype)(y0)) \
129 : "cc", "g1", "g2"); \
130 __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2)); \
131 r3 = _t1; r2 = _t2; \
132 } while (0)
133
134 #define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0) \
135 do { \
136 /* We need to fool gcc, as we need to pass more than 10 \
137 input/outputs. */ \
138 register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2"); \
139 __asm__ __volatile__ ("
140 subcc %r8,%9,%1
141 subxcc %r6,%7,%0
142 subxcc %r4,%5,%%g2
143 subx %r2,%3,%%g1" \
144 : "=&r" ((USItype)(r1)), \
145 "=&r" ((USItype)(r0)) \
146 : "%rJ" ((USItype)(x3)), \
147 "rI" ((USItype)(y3)), \
148 "%rJ" ((USItype)(x2)), \
149 "rI" ((USItype)(y2)), \
150 "%rJ" ((USItype)(x1)), \
151 "rI" ((USItype)(y1)), \
152 "%rJ" ((USItype)(x0)), \
153 "rI" ((USItype)(y0)) \
154 : "cc", "g1", "g2"); \
155 __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2)); \
156 r3 = _t1; r2 = _t2; \
157 } while (0)
158
159 #define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
160
161 #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)
162
163 #define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i) \
164 __asm__ ("addcc %3,%4,%3
165 addxcc %2,%%g0,%2
166 addxcc %1,%%g0,%1
167 addx %0,%%g0,%0" \
168 : "=&r" ((USItype)(x3)), \
169 "=&r" ((USItype)(x2)), \
170 "=&r" ((USItype)(x1)), \
171 "=&r" ((USItype)(x0)) \
172 : "rI" ((USItype)(i)), \
173 "" ((USItype)(x3)), \
174 "1" ((USItype)(x2)), \
175 "2" ((USItype)(x1)), \
176 "3" ((USItype)(x0)) \
177 : "cc")
178
179 #ifndef CONFIG_SMP
180 extern struct task_struct *last_task_used_math;
181 #endif
182
183 /* Obtain the current rounding mode. */
184 #ifndef FP_ROUNDMODE
185 #ifdef CONFIG_SMP
186 #define FP_ROUNDMODE ((current->thread.fsr >> 30) & 0x3)
187 #else
188 #define FP_ROUNDMODE ((last_task_used_math->thread.fsr >> 30) & 0x3)
189 #endif
190 #endif
191
192 /* Exception flags. */
193 #define FP_EX_INVALID (1 << 4)
194 #define FP_EX_OVERFLOW (1 << 3)
195 #define FP_EX_UNDERFLOW (1 << 2)
196 #define FP_EX_DIVZERO (1 << 1)
197 #define FP_EX_INEXACT (1 << 0)
198
199 #define FP_HANDLE_EXCEPTIONS return _fex
200
201 #ifdef CONFIG_SMP
202 #define FP_INHIBIT_RESULTS ((current->thread.fsr >> 23) & _fex)
203 #else
204 #define FP_INHIBIT_RESULTS ((last_task_used_math->thread.fsr >> 23) & _fex)
205 #endif
206
207 #endif
208
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