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1/* Machine-dependent software floating-point definitions.
2 Alpha userland IEEE 128-bit version.
3 Copyright (C) 2004-2019 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 Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the 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 Lesser General Public License for more details.
18
19 You should have received a copy of the GNU Lesser General Public
20 License along with the GNU C Library. If not, see
21 <http://www.gnu.org/licenses/>. */
22
23#include <fenv_libc.h>
24
25#define _FP_W_TYPE_SIZE 64
26#define _FP_W_TYPE unsigned long
27#define _FP_WS_TYPE signed long
28#define _FP_I_TYPE long
29
30#define _FP_MUL_MEAT_S(R,X,Y) \
31 _FP_MUL_MEAT_1_imm(_FP_WFRACBITS_S,R,X,Y)
32#define _FP_MUL_MEAT_D(R,X,Y) \
33 _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
34#define _FP_MUL_MEAT_Q(R,X,Y) \
35 _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
36
37#define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_imm(S,R,X,Y,_FP_DIV_HELP_imm)
38#define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_1_udiv_norm(D,R,X,Y)
39#define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_2_udiv(Q,R,X,Y)
40
41#define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
42#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1)
43#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1
44#define _FP_NANSIGN_S 0
45#define _FP_NANSIGN_D 0
46#define _FP_NANSIGN_Q 0
47
48#define _FP_KEEPNANFRACP 1
49#define _FP_QNANNEGATEDP 0
50
51/* Alpha Architecture Handbook, 4.7.10.4 sez that we should prefer any
52 type of NaN in Fb, then Fa. */
53#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
54 do { \
55 R##_s = Y##_s; \
56 _FP_FRAC_COPY_##wc(R,X); \
57 R##_c = FP_CLS_NAN; \
58 } while (0)
59
60/* Rounding mode settings. */
61#define FP_RND_NEAREST FE_TONEAREST
62#define FP_RND_ZERO FE_TOWARDZERO
63#define FP_RND_PINF FE_UPWARD
64#define FP_RND_MINF FE_DOWNWARD
65
66/* Obtain the current rounding mode. It's given as an argument to
67 all the Ots functions, with 4 meaning "dynamic". */
68#define FP_ROUNDMODE _round
69
70/* Exception flags. */
71#define FP_EX_INVALID FE_INVALID
72#define FP_EX_OVERFLOW FE_OVERFLOW
73#define FP_EX_UNDERFLOW FE_UNDERFLOW
74#define FP_EX_DIVZERO FE_DIVBYZERO
75#define FP_EX_INEXACT FE_INEXACT
76
77#define _FP_TININESS_AFTER_ROUNDING 1
78
79#define FP_INIT_ROUNDMODE \
80do { \
81 if (__builtin_expect (_round == 4, 0)) \
82 { \
83 unsigned long t; \
84 __asm__ __volatile__("excb; mf_fpcr %0" : "=f"(t)); \
85 _round = (t >> FPCR_ROUND_SHIFT) & 3; \
86 } \
87} while (0)
88
89/* We copy the libm function into libc for soft-fp. */
90extern int __feraiseexcept (int __excepts) attribute_hidden;
91
92#define FP_HANDLE_EXCEPTIONS \
93do { \
94 if (__builtin_expect (_fex, 0)) \
95 __feraiseexcept (_fex); \
96} while (0)
97
98#define FP_TRAPPING_EXCEPTIONS \
99 ((__ieee_get_fp_control () & SWCR_ENABLE_MASK) << SWCR_ENABLE_SHIFT)
100

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