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1da177e4 LT |
1 | /* |
2 | * Linux/PA-RISC Project (http://www.parisc-linux.org/) | |
3 | * | |
4 | * Floating-point emulation code | |
5 | * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2, or (at your option) | |
10 | * any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | /* | |
22 | * BEGIN_DESC | |
23 | * | |
24 | * File: | |
25 | * @(#) pa/fp/denormal.c $ Revision: $ | |
26 | * | |
27 | * Purpose: | |
28 | * <<please update with a synopsis of the functionality provided by this file>> | |
29 | * | |
30 | * External Interfaces: | |
31 | * <<the following list was autogenerated, please review>> | |
32 | * dbl_denormalize(dbl_opndp1,dbl_opndp2,inexactflag,rmode) | |
33 | * sgl_denormalize(sgl_opnd,inexactflag,rmode) | |
34 | * | |
35 | * Internal Interfaces: | |
36 | * <<please update>> | |
37 | * | |
38 | * Theory: | |
39 | * <<please update with a overview of the operation of this file>> | |
40 | * | |
41 | * END_DESC | |
42 | */ | |
43 | ||
44 | ||
45 | ||
46 | #include "float.h" | |
47 | #include "sgl_float.h" | |
48 | #include "dbl_float.h" | |
49 | #include "hppa.h" | |
50 | #include <linux/kernel.h> | |
51 | /* #include <machine/sys/mdep_private.h> */ | |
52 | ||
53 | #undef Fpustatus_register | |
54 | #define Fpustatus_register Fpu_register[0] | |
55 | ||
56 | void | |
57 | sgl_denormalize(unsigned int *sgl_opnd, boolean *inexactflag, int rmode) | |
58 | { | |
59 | unsigned int opnd; | |
60 | int sign, exponent; | |
61 | boolean guardbit = FALSE, stickybit, inexact; | |
62 | ||
63 | opnd = *sgl_opnd; | |
64 | stickybit = *inexactflag; | |
65 | exponent = Sgl_exponent(opnd) - SGL_WRAP; | |
66 | sign = Sgl_sign(opnd); | |
67 | Sgl_denormalize(opnd,exponent,guardbit,stickybit,inexact); | |
68 | if (inexact) { | |
69 | switch (rmode) { | |
70 | case ROUNDPLUS: | |
71 | if (sign == 0) { | |
72 | Sgl_increment(opnd); | |
73 | } | |
74 | break; | |
75 | case ROUNDMINUS: | |
76 | if (sign != 0) { | |
77 | Sgl_increment(opnd); | |
78 | } | |
79 | break; | |
80 | case ROUNDNEAREST: | |
81 | if (guardbit && (stickybit || | |
82 | Sgl_isone_lowmantissa(opnd))) { | |
83 | Sgl_increment(opnd); | |
84 | } | |
85 | break; | |
86 | } | |
87 | } | |
88 | Sgl_set_sign(opnd,sign); | |
89 | *sgl_opnd = opnd; | |
90 | *inexactflag = inexact; | |
91 | return; | |
92 | } | |
93 | ||
94 | void | |
95 | dbl_denormalize(unsigned int *dbl_opndp1, | |
96 | unsigned int * dbl_opndp2, | |
97 | boolean *inexactflag, | |
98 | int rmode) | |
99 | { | |
100 | unsigned int opndp1, opndp2; | |
101 | int sign, exponent; | |
102 | boolean guardbit = FALSE, stickybit, inexact; | |
103 | ||
104 | opndp1 = *dbl_opndp1; | |
105 | opndp2 = *dbl_opndp2; | |
106 | stickybit = *inexactflag; | |
107 | exponent = Dbl_exponent(opndp1) - DBL_WRAP; | |
108 | sign = Dbl_sign(opndp1); | |
109 | Dbl_denormalize(opndp1,opndp2,exponent,guardbit,stickybit,inexact); | |
110 | if (inexact) { | |
111 | switch (rmode) { | |
112 | case ROUNDPLUS: | |
113 | if (sign == 0) { | |
114 | Dbl_increment(opndp1,opndp2); | |
115 | } | |
116 | break; | |
117 | case ROUNDMINUS: | |
118 | if (sign != 0) { | |
119 | Dbl_increment(opndp1,opndp2); | |
120 | } | |
121 | break; | |
122 | case ROUNDNEAREST: | |
123 | if (guardbit && (stickybit || | |
124 | Dbl_isone_lowmantissap2(opndp2))) { | |
125 | Dbl_increment(opndp1,opndp2); | |
126 | } | |
127 | break; | |
128 | } | |
129 | } | |
130 | Dbl_set_sign(opndp1,sign); | |
131 | *dbl_opndp1 = opndp1; | |
132 | *dbl_opndp2 = opndp2; | |
133 | *inexactflag = inexact; | |
134 | return; | |
135 | } |