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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* Machine-dependent software floating-point definitions.
2 S/390 kernel 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/*
56 * If one NaN is signaling and the other is not,
57 * we choose that one, otherwise we choose X.
58 */
59#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
60 do { \
61 if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs) \
62 && !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)) \
63 { \
64 R##_s = Y##_s; \
65 _FP_FRAC_COPY_##wc(R,Y); \
66 } \
67 else \
68 { \
69 R##_s = X##_s; \
70 _FP_FRAC_COPY_##wc(R,X); \
71 } \
72 R##_c = FP_CLS_NAN; \
73 } while (0)
74
75/* Some assembly to speed things up. */
76#define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({ \
77 unsigned int __r2 = (x2) + (y2); \
78 unsigned int __r1 = (x1); \
79 unsigned int __r0 = (x0); \
80 __asm__ (" alr %2,%3\n" \
81 " brc 12,0f\n" \
82 " lhi 0,1\n" \
83 " alr %1,0\n" \
84 " brc 12,0f\n" \
85 " alr %0,0\n" \
86 "0:" \
87 : "+&d" (__r2), "+&d" (__r1), "+&d" (__r0) \
88 : "d" (y0), "i" (1) : "cc", "0" ); \
89 __asm__ (" alr %1,%2\n" \
90 " brc 12,0f\n" \
91 " ahi %0,1\n" \
92 "0:" \
93 : "+&d" (__r2), "+&d" (__r1) \
94 : "d" (y1) : "cc" ); \
95 (r2) = __r2; \
96 (r1) = __r1; \
97 (r0) = __r0; \
98})
99
100#define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({ \
101 unsigned int __r2 = (x2) - (y2); \
102 unsigned int __r1 = (x1); \
103 unsigned int __r0 = (x0); \
104 __asm__ (" slr %2,%3\n" \
105 " brc 3,0f\n" \
106 " lhi 0,1\n" \
107 " slr %1,0\n" \
108 " brc 3,0f\n" \
109 " slr %0,0\n" \
110 "0:" \
111 : "+&d" (__r2), "+&d" (__r1), "+&d" (__r0) \
112 : "d" (y0) : "cc", "0" ); \
113 __asm__ (" slr %1,%2\n" \
114 " brc 3,0f\n" \
115 " ahi %0,-1\n" \
116 "0:" \
117 : "+&d" (__r2), "+&d" (__r1) \
118 : "d" (y1) : "cc" ); \
119 (r2) = __r2; \
120 (r1) = __r1; \
121 (r0) = __r0; \
122})
123
124#define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
125
126/* Obtain the current rounding mode. */
127#define FP_ROUNDMODE mode
128
129/* Exception flags. */
130#define FP_EX_INVALID 0x800000
131#define FP_EX_DIVZERO 0x400000
132#define FP_EX_OVERFLOW 0x200000
133#define FP_EX_UNDERFLOW 0x100000
134#define FP_EX_INEXACT 0x080000
135
136/* We write the results always */
137#define FP_INHIBIT_RESULTS 0
138
139#endif