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1 | /* Machine-dependent software floating-point definitions. |
---|---|
2 | Alpha userland IEEE 128-bit version. |
3 | Copyright (C) 2004-2022 Free Software Foundation, Inc. |
4 | This file is part of the GNU C Library. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library. If not, see |
18 | <https://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <fenv_libc.h> |
21 | |
22 | #define _FP_W_TYPE_SIZE 64 |
23 | #define _FP_W_TYPE unsigned long |
24 | #define _FP_WS_TYPE signed long |
25 | #define _FP_I_TYPE long |
26 | |
27 | #define _FP_MUL_MEAT_S(R,X,Y) \ |
28 | _FP_MUL_MEAT_1_imm(_FP_WFRACBITS_S,R,X,Y) |
29 | #define _FP_MUL_MEAT_D(R,X,Y) \ |
30 | _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm) |
31 | #define _FP_MUL_MEAT_Q(R,X,Y) \ |
32 | _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm) |
33 | |
34 | #define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_imm(S,R,X,Y,_FP_DIV_HELP_imm) |
35 | #define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_1_udiv_norm(D,R,X,Y) |
36 | #define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_2_udiv(Q,R,X,Y) |
37 | |
38 | #define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1) |
39 | #define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1) |
40 | #define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1 |
41 | #define _FP_NANSIGN_S 0 |
42 | #define _FP_NANSIGN_D 0 |
43 | #define _FP_NANSIGN_Q 0 |
44 | |
45 | #define _FP_KEEPNANFRACP 1 |
46 | #define _FP_QNANNEGATEDP 0 |
47 | |
48 | /* Alpha Architecture Handbook, 4.7.10.4 sez that we should prefer any |
49 | type of NaN in Fb, then Fa. */ |
50 | #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \ |
51 | do { \ |
52 | R##_s = Y##_s; \ |
53 | _FP_FRAC_COPY_##wc(R,X); \ |
54 | R##_c = FP_CLS_NAN; \ |
55 | } while (0) |
56 | |
57 | /* Rounding mode settings. */ |
58 | #define FP_RND_NEAREST FE_TONEAREST |
59 | #define FP_RND_ZERO FE_TOWARDZERO |
60 | #define FP_RND_PINF FE_UPWARD |
61 | #define FP_RND_MINF FE_DOWNWARD |
62 | |
63 | /* Obtain the current rounding mode. It's given as an argument to |
64 | all the Ots functions, with 4 meaning "dynamic". */ |
65 | #define FP_ROUNDMODE _round |
66 | |
67 | /* Exception flags. */ |
68 | #define FP_EX_INVALID FE_INVALID |
69 | #define FP_EX_OVERFLOW FE_OVERFLOW |
70 | #define FP_EX_UNDERFLOW FE_UNDERFLOW |
71 | #define FP_EX_DIVZERO FE_DIVBYZERO |
72 | #define FP_EX_INEXACT FE_INEXACT |
73 | |
74 | #define _FP_TININESS_AFTER_ROUNDING 1 |
75 | |
76 | #define FP_INIT_ROUNDMODE \ |
77 | do { \ |
78 | if (__builtin_expect (_round == 4, 0)) \ |
79 | { \ |
80 | unsigned long t; \ |
81 | __asm__ __volatile__("excb; mf_fpcr %0" : "=f"(t)); \ |
82 | _round = (t >> FPCR_ROUND_SHIFT) & 3; \ |
83 | } \ |
84 | } while (0) |
85 | |
86 | /* We copy the libm function into libc for soft-fp. */ |
87 | extern int __feraiseexcept (int __excepts) attribute_hidden; |
88 | |
89 | #define FP_HANDLE_EXCEPTIONS \ |
90 | do { \ |
91 | if (__builtin_expect (_fex, 0)) \ |
92 | __feraiseexcept (_fex); \ |
93 | } while (0) |
94 | |
95 | #define FP_TRAPPING_EXCEPTIONS \ |
96 | ((__ieee_get_fp_control () & SWCR_ENABLE_MASK) << SWCR_ENABLE_SHIFT) |
97 |
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