[MATH-EMU]: Fix underflow exception reporting.
[linux-2.6.git] / include / asm-sparc64 / sfp-machine.h
1 /* Machine-dependent software floating-point definitions.
2    Sparc64 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) and
7                   David S. Miller (davem@redhat.com).
8
9    The GNU C Library is free software; you can redistribute it and/or
10    modify it under the terms of the GNU Library General Public License as
11    published by the Free Software Foundation; either version 2 of the
12    License, or (at your option) any later version.
13
14    The GNU C Library is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17    Library General Public License for more details.
18
19    You should have received a copy of the GNU Library General Public
20    License along with the GNU C Library; see the file COPYING.LIB.  If
21    not, write to the Free Software Foundation, Inc.,
22    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
23
24 #ifndef _SFP_MACHINE_H
25 #define _SFP_MACHINE_H
26    
27 #define _FP_W_TYPE_SIZE         64
28 #define _FP_W_TYPE              unsigned long
29 #define _FP_WS_TYPE             signed long
30 #define _FP_I_TYPE              long
31
32 #define _FP_MUL_MEAT_S(R,X,Y)                                   \
33   _FP_MUL_MEAT_1_imm(_FP_WFRACBITS_S,R,X,Y)
34 #define _FP_MUL_MEAT_D(R,X,Y)                                   \
35   _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
36 #define _FP_MUL_MEAT_Q(R,X,Y)                                   \
37   _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
38
39 #define _FP_DIV_MEAT_S(R,X,Y)   _FP_DIV_MEAT_1_imm(S,R,X,Y,_FP_DIV_HELP_imm)
40 #define _FP_DIV_MEAT_D(R,X,Y)   _FP_DIV_MEAT_1_udiv_norm(D,R,X,Y)
41 #define _FP_DIV_MEAT_Q(R,X,Y)   _FP_DIV_MEAT_2_udiv(Q,R,X,Y)
42
43 #define _FP_NANFRAC_S           ((_FP_QNANBIT_S << 1) - 1)
44 #define _FP_NANFRAC_D           ((_FP_QNANBIT_D << 1) - 1)
45 #define _FP_NANFRAC_Q           ((_FP_QNANBIT_Q << 1) - 1), -1
46 #define _FP_NANSIGN_S           0
47 #define _FP_NANSIGN_D           0
48 #define _FP_NANSIGN_Q           0
49
50 #define _FP_KEEPNANFRACP 1
51
52 /* If one NaN is signaling and the other is not,
53  * we choose that one, otherwise we choose X.
54  */
55 /* For _Qp_* and _Q_*, this should prefer X, for
56  * CPU instruction emulation this should prefer Y.
57  * (see SPAMv9 B.2.2 section).
58  */
59 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
60   do {                                                          \
61     if ((_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)          \
62         && !(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs))     \
63       {                                                         \
64         R##_s = X##_s;                                          \
65         _FP_FRAC_COPY_##wc(R,X);                                \
66       }                                                         \
67     else                                                        \
68       {                                                         \
69         R##_s = Y##_s;                                          \
70         _FP_FRAC_COPY_##wc(R,Y);                                \
71       }                                                         \
72     R##_c = FP_CLS_NAN;                                         \
73   } while (0)
74
75 /* Obtain the current rounding mode. */
76 #ifndef FP_ROUNDMODE
77 #define FP_ROUNDMODE    ((current_thread_info()->xfsr[0] >> 30) & 0x3)
78 #endif
79
80 /* Exception flags. */
81 #define FP_EX_INVALID           (1 << 4)
82 #define FP_EX_OVERFLOW          (1 << 3)
83 #define FP_EX_UNDERFLOW         (1 << 2)
84 #define FP_EX_DIVZERO           (1 << 1)
85 #define FP_EX_INEXACT           (1 << 0)
86
87 #define FP_HANDLE_EXCEPTIONS return _fex
88
89 #define FP_INHIBIT_RESULTS ((current_thread_info()->xfsr[0] >> 23) & _fex)
90
91 #define FP_TRAPPING_EXCEPTIONS ((current_thread_info()->xfsr[0] >> 23) & 0x1f)
92
93 #endif