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