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sfp-machine.h
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1 /* 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 ([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 int
31 #define _FP_WS_TYPE signed int
32 #define _FP_I_TYPE int
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 /*
55  * If one NaN is signaling and the other is not,
56  * we choose that one, otherwise we choose X.
57  */
58 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
59  do { \
60  if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs) \
61  && !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)) \
62  { \
63  R##_s = Y##_s; \
64  _FP_FRAC_COPY_##wc(R,Y); \
65  } \
66  else \
67  { \
68  R##_s = X##_s; \
69  _FP_FRAC_COPY_##wc(R,X); \
70  } \
71  R##_c = FP_CLS_NAN; \
72  } while (0)
73 
74 /* Some assembly to speed things up. */
75 #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({ \
76  unsigned int __r2 = (x2) + (y2); \
77  unsigned int __r1 = (x1); \
78  unsigned int __r0 = (x0); \
79  asm volatile( \
80  " 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 volatile( \
90  " alr %1,%2\n" \
91  " brc 12,0f\n" \
92  " ahi %0,1\n" \
93  "0:" \
94  : "+&d" (__r2), "+&d" (__r1) \
95  : "d" (y1) : "cc"); \
96  (r2) = __r2; \
97  (r1) = __r1; \
98  (r0) = __r0; \
99 })
100 
101 #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({ \
102  unsigned int __r2 = (x2) - (y2); \
103  unsigned int __r1 = (x1); \
104  unsigned int __r0 = (x0); \
105  asm volatile( \
106  " slr %2,%3\n" \
107  " brc 3,0f\n" \
108  " lhi 0,1\n" \
109  " slr %1,0\n" \
110  " brc 3,0f\n" \
111  " slr %0,0\n" \
112  "0:" \
113  : "+&d" (__r2), "+&d" (__r1), "+&d" (__r0) \
114  : "d" (y0) : "cc", "0"); \
115  asm volatile( \
116  " slr %1,%2\n" \
117  " brc 3,0f\n" \
118  " ahi %0,-1\n" \
119  "0:" \
120  : "+&d" (__r2), "+&d" (__r1) \
121  : "d" (y1) : "cc"); \
122  (r2) = __r2; \
123  (r1) = __r1; \
124  (r0) = __r0; \
125 })
126 
127 #define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
128 
129 /* Obtain the current rounding mode. */
130 #define FP_ROUNDMODE mode
131 
132 /* Exception flags. */
133 #define FP_EX_INVALID 0x800000
134 #define FP_EX_DIVZERO 0x400000
135 #define FP_EX_OVERFLOW 0x200000
136 #define FP_EX_UNDERFLOW 0x100000
137 #define FP_EX_INEXACT 0x080000
138 
139 /* We write the results always */
140 #define FP_INHIBIT_RESULTS 0
141 
142 #endif