| /* Software floating-point emulation. |
| Definitions for IEEE Extended Precision. |
| Copyright (C) 1999-2019 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Jakub Jelinek (jj@ultra.linux.cz). |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| In addition to the permissions in the GNU Lesser General Public |
| License, the Free Software Foundation gives you unlimited |
| permission to link the compiled version of this file into |
| combinations with other programs, and to distribute those |
| combinations without any restriction coming from the use of this |
| file. (The Lesser General Public License restrictions do apply in |
| other respects; for example, they cover modification of the file, |
| and distribution when not linked into a combine executable.) |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef SOFT_FP_EXTENDED_H |
| #define SOFT_FP_EXTENDED_H 1 |
| |
| #if _FP_W_TYPE_SIZE < 32 |
| # error "Here's a nickel, kid. Go buy yourself a real computer." |
| #endif |
| |
| #if _FP_W_TYPE_SIZE < 64 |
| # define _FP_FRACTBITS_E (4*_FP_W_TYPE_SIZE) |
| # define _FP_FRACTBITS_DW_E (8*_FP_W_TYPE_SIZE) |
| #else |
| # define _FP_FRACTBITS_E (2*_FP_W_TYPE_SIZE) |
| # define _FP_FRACTBITS_DW_E (4*_FP_W_TYPE_SIZE) |
| #endif |
| |
| #define _FP_FRACBITS_E 64 |
| #define _FP_FRACXBITS_E (_FP_FRACTBITS_E - _FP_FRACBITS_E) |
| #define _FP_WFRACBITS_E (_FP_WORKBITS + _FP_FRACBITS_E) |
| #define _FP_WFRACXBITS_E (_FP_FRACTBITS_E - _FP_WFRACBITS_E) |
| #define _FP_EXPBITS_E 15 |
| #define _FP_EXPBIAS_E 16383 |
| #define _FP_EXPMAX_E 32767 |
| |
| #define _FP_QNANBIT_E \ |
| ((_FP_W_TYPE) 1 << (_FP_FRACBITS_E-2) % _FP_W_TYPE_SIZE) |
| #define _FP_QNANBIT_SH_E \ |
| ((_FP_W_TYPE) 1 << (_FP_FRACBITS_E-2+_FP_WORKBITS) % _FP_W_TYPE_SIZE) |
| #define _FP_IMPLBIT_E \ |
| ((_FP_W_TYPE) 1 << (_FP_FRACBITS_E-1) % _FP_W_TYPE_SIZE) |
| #define _FP_IMPLBIT_SH_E \ |
| ((_FP_W_TYPE) 1 << (_FP_FRACBITS_E-1+_FP_WORKBITS) % _FP_W_TYPE_SIZE) |
| #define _FP_OVERFLOW_E \ |
| ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_E % _FP_W_TYPE_SIZE)) |
| |
| #define _FP_WFRACBITS_DW_E (2 * _FP_WFRACBITS_E) |
| #define _FP_WFRACXBITS_DW_E (_FP_FRACTBITS_DW_E - _FP_WFRACBITS_DW_E) |
| #define _FP_HIGHBIT_DW_E \ |
| ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_E - 1) % _FP_W_TYPE_SIZE) |
| |
| typedef float XFtype __attribute__ ((mode (XF))); |
| |
| #if _FP_W_TYPE_SIZE < 64 |
| |
| union _FP_UNION_E |
| { |
| XFtype flt; |
| struct _FP_STRUCT_LAYOUT |
| { |
| # if __BYTE_ORDER == __BIG_ENDIAN |
| unsigned long pad1 : _FP_W_TYPE_SIZE; |
| unsigned long pad2 : (_FP_W_TYPE_SIZE - 1 - _FP_EXPBITS_E); |
| unsigned long sign : 1; |
| unsigned long exp : _FP_EXPBITS_E; |
| unsigned long frac1 : _FP_W_TYPE_SIZE; |
| unsigned long frac0 : _FP_W_TYPE_SIZE; |
| # else |
| unsigned long frac0 : _FP_W_TYPE_SIZE; |
| unsigned long frac1 : _FP_W_TYPE_SIZE; |
| unsigned exp : _FP_EXPBITS_E; |
| unsigned sign : 1; |
| # endif /* not bigendian */ |
| } bits; |
| }; |
| |
| |
| # define FP_DECL_E(X) _FP_DECL (4, X) |
| |
| # define FP_UNPACK_RAW_E(X, val) \ |
| do \ |
| { \ |
| union _FP_UNION_E FP_UNPACK_RAW_E_flo; \ |
| FP_UNPACK_RAW_E_flo.flt = (val); \ |
| \ |
| X##_f[2] = 0; \ |
| X##_f[3] = 0; \ |
| X##_f[0] = FP_UNPACK_RAW_E_flo.bits.frac0; \ |
| X##_f[1] = FP_UNPACK_RAW_E_flo.bits.frac1; \ |
| X##_f[1] &= ~_FP_IMPLBIT_E; \ |
| X##_e = FP_UNPACK_RAW_E_flo.bits.exp; \ |
| X##_s = FP_UNPACK_RAW_E_flo.bits.sign; \ |
| } \ |
| while (0) |
| |
| # define FP_UNPACK_RAW_EP(X, val) \ |
| do \ |
| { \ |
| union _FP_UNION_E *FP_UNPACK_RAW_EP_flo \ |
| = (union _FP_UNION_E *) (val); \ |
| \ |
| X##_f[2] = 0; \ |
| X##_f[3] = 0; \ |
| X##_f[0] = FP_UNPACK_RAW_EP_flo->bits.frac0; \ |
| X##_f[1] = FP_UNPACK_RAW_EP_flo->bits.frac1; \ |
| X##_f[1] &= ~_FP_IMPLBIT_E; \ |
| X##_e = FP_UNPACK_RAW_EP_flo->bits.exp; \ |
| X##_s = FP_UNPACK_RAW_EP_flo->bits.sign; \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_RAW_E(val, X) \ |
| do \ |
| { \ |
| union _FP_UNION_E FP_PACK_RAW_E_flo; \ |
| \ |
| if (X##_e) \ |
| X##_f[1] |= _FP_IMPLBIT_E; \ |
| else \ |
| X##_f[1] &= ~(_FP_IMPLBIT_E); \ |
| FP_PACK_RAW_E_flo.bits.frac0 = X##_f[0]; \ |
| FP_PACK_RAW_E_flo.bits.frac1 = X##_f[1]; \ |
| FP_PACK_RAW_E_flo.bits.exp = X##_e; \ |
| FP_PACK_RAW_E_flo.bits.sign = X##_s; \ |
| \ |
| (val) = FP_PACK_RAW_E_flo.flt; \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_RAW_EP(val, X) \ |
| do \ |
| { \ |
| if (!FP_INHIBIT_RESULTS) \ |
| { \ |
| union _FP_UNION_E *FP_PACK_RAW_EP_flo \ |
| = (union _FP_UNION_E *) (val); \ |
| \ |
| if (X##_e) \ |
| X##_f[1] |= _FP_IMPLBIT_E; \ |
| else \ |
| X##_f[1] &= ~(_FP_IMPLBIT_E); \ |
| FP_PACK_RAW_EP_flo->bits.frac0 = X##_f[0]; \ |
| FP_PACK_RAW_EP_flo->bits.frac1 = X##_f[1]; \ |
| FP_PACK_RAW_EP_flo->bits.exp = X##_e; \ |
| FP_PACK_RAW_EP_flo->bits.sign = X##_s; \ |
| } \ |
| } \ |
| while (0) |
| |
| # define FP_UNPACK_E(X, val) \ |
| do \ |
| { \ |
| FP_UNPACK_RAW_E (X, (val)); \ |
| _FP_UNPACK_CANONICAL (E, 4, X); \ |
| } \ |
| while (0) |
| |
| # define FP_UNPACK_EP(X, val) \ |
| do \ |
| { \ |
| FP_UNPACK_RAW_EP (X, (val)); \ |
| _FP_UNPACK_CANONICAL (E, 4, X); \ |
| } \ |
| while (0) |
| |
| # define FP_UNPACK_SEMIRAW_E(X, val) \ |
| do \ |
| { \ |
| FP_UNPACK_RAW_E (X, (val)); \ |
| _FP_UNPACK_SEMIRAW (E, 4, X); \ |
| } \ |
| while (0) |
| |
| # define FP_UNPACK_SEMIRAW_EP(X, val) \ |
| do \ |
| { \ |
| FP_UNPACK_RAW_EP (X, (val)); \ |
| _FP_UNPACK_SEMIRAW (E, 4, X); \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_E(val, X) \ |
| do \ |
| { \ |
| _FP_PACK_CANONICAL (E, 4, X); \ |
| FP_PACK_RAW_E ((val), X); \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_EP(val, X) \ |
| do \ |
| { \ |
| _FP_PACK_CANONICAL (E, 4, X); \ |
| FP_PACK_RAW_EP ((val), X); \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_SEMIRAW_E(val, X) \ |
| do \ |
| { \ |
| _FP_PACK_SEMIRAW (E, 4, X); \ |
| FP_PACK_RAW_E ((val), X); \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_SEMIRAW_EP(val, X) \ |
| do \ |
| { \ |
| _FP_PACK_SEMIRAW (E, 4, X); \ |
| FP_PACK_RAW_EP ((val), X); \ |
| } \ |
| while (0) |
| |
| # define FP_ISSIGNAN_E(X) _FP_ISSIGNAN (E, 4, X) |
| # define FP_NEG_E(R, X) _FP_NEG (E, 4, R, X) |
| # define FP_ADD_E(R, X, Y) _FP_ADD (E, 4, R, X, Y) |
| # define FP_SUB_E(R, X, Y) _FP_SUB (E, 4, R, X, Y) |
| # define FP_MUL_E(R, X, Y) _FP_MUL (E, 4, R, X, Y) |
| # define FP_DIV_E(R, X, Y) _FP_DIV (E, 4, R, X, Y) |
| # define FP_SQRT_E(R, X) _FP_SQRT (E, 4, R, X) |
| # define FP_FMA_E(R, X, Y, Z) _FP_FMA (E, 4, 8, R, X, Y, Z) |
| |
| /* Square root algorithms: |
| We have just one right now, maybe Newton approximation |
| should be added for those machines where division is fast. |
| This has special _E version because standard _4 square |
| root would not work (it has to start normally with the |
| second word and not the first), but as we have to do it |
| anyway, we optimize it by doing most of the calculations |
| in two UWtype registers instead of four. */ |
| |
| # define _FP_SQRT_MEAT_E(R, S, T, X, q) \ |
| do \ |
| { \ |
| (q) = (_FP_W_TYPE) 1 << (_FP_W_TYPE_SIZE - 1); \ |
| _FP_FRAC_SRL_4 (X, (_FP_WORKBITS)); \ |
| while (q) \ |
| { \ |
| T##_f[1] = S##_f[1] + (q); \ |
| if (T##_f[1] <= X##_f[1]) \ |
| { \ |
| S##_f[1] = T##_f[1] + (q); \ |
| X##_f[1] -= T##_f[1]; \ |
| R##_f[1] += (q); \ |
| } \ |
| _FP_FRAC_SLL_2 (X, 1); \ |
| (q) >>= 1; \ |
| } \ |
| (q) = (_FP_W_TYPE) 1 << (_FP_W_TYPE_SIZE - 1); \ |
| while (q) \ |
| { \ |
| T##_f[0] = S##_f[0] + (q); \ |
| T##_f[1] = S##_f[1]; \ |
| if (T##_f[1] < X##_f[1] \ |
| || (T##_f[1] == X##_f[1] \ |
| && T##_f[0] <= X##_f[0])) \ |
| { \ |
| S##_f[0] = T##_f[0] + (q); \ |
| S##_f[1] += (T##_f[0] > S##_f[0]); \ |
| _FP_FRAC_DEC_2 (X, T); \ |
| R##_f[0] += (q); \ |
| } \ |
| _FP_FRAC_SLL_2 (X, 1); \ |
| (q) >>= 1; \ |
| } \ |
| _FP_FRAC_SLL_4 (R, (_FP_WORKBITS)); \ |
| if (X##_f[0] | X##_f[1]) \ |
| { \ |
| if (S##_f[1] < X##_f[1] \ |
| || (S##_f[1] == X##_f[1] \ |
| && S##_f[0] < X##_f[0])) \ |
| R##_f[0] |= _FP_WORK_ROUND; \ |
| R##_f[0] |= _FP_WORK_STICKY; \ |
| } \ |
| } \ |
| while (0) |
| |
| # define FP_CMP_E(r, X, Y, un, ex) _FP_CMP (E, 4, (r), X, Y, (un), (ex)) |
| # define FP_CMP_EQ_E(r, X, Y, ex) _FP_CMP_EQ (E, 4, (r), X, Y, (ex)) |
| # define FP_CMP_UNORD_E(r, X, Y, ex) _FP_CMP_UNORD (E, 4, (r), X, Y, (ex)) |
| |
| # define FP_TO_INT_E(r, X, rsz, rsg) _FP_TO_INT (E, 4, (r), X, (rsz), (rsg)) |
| # define FP_TO_INT_ROUND_E(r, X, rsz, rsg) \ |
| _FP_TO_INT_ROUND (E, 4, (r), X, (rsz), (rsg)) |
| # define FP_FROM_INT_E(X, r, rs, rt) _FP_FROM_INT (E, 4, X, (r), (rs), rt) |
| |
| # define _FP_FRAC_HIGH_E(X) (X##_f[2]) |
| # define _FP_FRAC_HIGH_RAW_E(X) (X##_f[1]) |
| |
| # define _FP_FRAC_HIGH_DW_E(X) (X##_f[4]) |
| |
| #else /* not _FP_W_TYPE_SIZE < 64 */ |
| union _FP_UNION_E |
| { |
| XFtype flt; |
| struct _FP_STRUCT_LAYOUT |
| { |
| # if __BYTE_ORDER == __BIG_ENDIAN |
| _FP_W_TYPE pad : (_FP_W_TYPE_SIZE - 1 - _FP_EXPBITS_E); |
| unsigned sign : 1; |
| unsigned exp : _FP_EXPBITS_E; |
| _FP_W_TYPE frac : _FP_W_TYPE_SIZE; |
| # else |
| _FP_W_TYPE frac : _FP_W_TYPE_SIZE; |
| unsigned exp : _FP_EXPBITS_E; |
| unsigned sign : 1; |
| # endif |
| } bits; |
| }; |
| |
| # define FP_DECL_E(X) _FP_DECL (2, X) |
| |
| # define FP_UNPACK_RAW_E(X, val) \ |
| do \ |
| { \ |
| union _FP_UNION_E FP_UNPACK_RAW_E_flo; \ |
| FP_UNPACK_RAW_E_flo.flt = (val); \ |
| \ |
| X##_f0 = FP_UNPACK_RAW_E_flo.bits.frac; \ |
| X##_f0 &= ~_FP_IMPLBIT_E; \ |
| X##_f1 = 0; \ |
| X##_e = FP_UNPACK_RAW_E_flo.bits.exp; \ |
| X##_s = FP_UNPACK_RAW_E_flo.bits.sign; \ |
| } \ |
| while (0) |
| |
| # define FP_UNPACK_RAW_EP(X, val) \ |
| do \ |
| { \ |
| union _FP_UNION_E *FP_UNPACK_RAW_EP_flo \ |
| = (union _FP_UNION_E *) (val); \ |
| \ |
| X##_f0 = FP_UNPACK_RAW_EP_flo->bits.frac; \ |
| X##_f0 &= ~_FP_IMPLBIT_E; \ |
| X##_f1 = 0; \ |
| X##_e = FP_UNPACK_RAW_EP_flo->bits.exp; \ |
| X##_s = FP_UNPACK_RAW_EP_flo->bits.sign; \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_RAW_E(val, X) \ |
| do \ |
| { \ |
| union _FP_UNION_E FP_PACK_RAW_E_flo; \ |
| \ |
| if (X##_e) \ |
| X##_f0 |= _FP_IMPLBIT_E; \ |
| else \ |
| X##_f0 &= ~(_FP_IMPLBIT_E); \ |
| FP_PACK_RAW_E_flo.bits.frac = X##_f0; \ |
| FP_PACK_RAW_E_flo.bits.exp = X##_e; \ |
| FP_PACK_RAW_E_flo.bits.sign = X##_s; \ |
| \ |
| (val) = FP_PACK_RAW_E_flo.flt; \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_RAW_EP(fs, val, X) \ |
| do \ |
| { \ |
| if (!FP_INHIBIT_RESULTS) \ |
| { \ |
| union _FP_UNION_E *FP_PACK_RAW_EP_flo \ |
| = (union _FP_UNION_E *) (val); \ |
| \ |
| if (X##_e) \ |
| X##_f0 |= _FP_IMPLBIT_E; \ |
| else \ |
| X##_f0 &= ~(_FP_IMPLBIT_E); \ |
| FP_PACK_RAW_EP_flo->bits.frac = X##_f0; \ |
| FP_PACK_RAW_EP_flo->bits.exp = X##_e; \ |
| FP_PACK_RAW_EP_flo->bits.sign = X##_s; \ |
| } \ |
| } \ |
| while (0) |
| |
| |
| # define FP_UNPACK_E(X, val) \ |
| do \ |
| { \ |
| FP_UNPACK_RAW_E (X, (val)); \ |
| _FP_UNPACK_CANONICAL (E, 2, X); \ |
| } \ |
| while (0) |
| |
| # define FP_UNPACK_EP(X, val) \ |
| do \ |
| { \ |
| FP_UNPACK_RAW_EP (X, (val)); \ |
| _FP_UNPACK_CANONICAL (E, 2, X); \ |
| } \ |
| while (0) |
| |
| # define FP_UNPACK_SEMIRAW_E(X, val) \ |
| do \ |
| { \ |
| FP_UNPACK_RAW_E (X, (val)); \ |
| _FP_UNPACK_SEMIRAW (E, 2, X); \ |
| } \ |
| while (0) |
| |
| # define FP_UNPACK_SEMIRAW_EP(X, val) \ |
| do \ |
| { \ |
| FP_UNPACK_RAW_EP (X, (val)); \ |
| _FP_UNPACK_SEMIRAW (E, 2, X); \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_E(val, X) \ |
| do \ |
| { \ |
| _FP_PACK_CANONICAL (E, 2, X); \ |
| FP_PACK_RAW_E ((val), X); \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_EP(val, X) \ |
| do \ |
| { \ |
| _FP_PACK_CANONICAL (E, 2, X); \ |
| FP_PACK_RAW_EP ((val), X); \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_SEMIRAW_E(val, X) \ |
| do \ |
| { \ |
| _FP_PACK_SEMIRAW (E, 2, X); \ |
| FP_PACK_RAW_E ((val), X); \ |
| } \ |
| while (0) |
| |
| # define FP_PACK_SEMIRAW_EP(val, X) \ |
| do \ |
| { \ |
| _FP_PACK_SEMIRAW (E, 2, X); \ |
| FP_PACK_RAW_EP ((val), X); \ |
| } \ |
| while (0) |
| |
| # define FP_ISSIGNAN_E(X) _FP_ISSIGNAN (E, 2, X) |
| # define FP_NEG_E(R, X) _FP_NEG (E, 2, R, X) |
| # define FP_ADD_E(R, X, Y) _FP_ADD (E, 2, R, X, Y) |
| # define FP_SUB_E(R, X, Y) _FP_SUB (E, 2, R, X, Y) |
| # define FP_MUL_E(R, X, Y) _FP_MUL (E, 2, R, X, Y) |
| # define FP_DIV_E(R, X, Y) _FP_DIV (E, 2, R, X, Y) |
| # define FP_SQRT_E(R, X) _FP_SQRT (E, 2, R, X) |
| # define FP_FMA_E(R, X, Y, Z) _FP_FMA (E, 2, 4, R, X, Y, Z) |
| |
| /* Square root algorithms: |
| We have just one right now, maybe Newton approximation |
| should be added for those machines where division is fast. |
| We optimize it by doing most of the calculations |
| in one UWtype registers instead of two, although we don't |
| have to. */ |
| # define _FP_SQRT_MEAT_E(R, S, T, X, q) \ |
| do \ |
| { \ |
| (q) = (_FP_W_TYPE) 1 << (_FP_W_TYPE_SIZE - 1); \ |
| _FP_FRAC_SRL_2 (X, (_FP_WORKBITS)); \ |
| while (q) \ |
| { \ |
| T##_f0 = S##_f0 + (q); \ |
| if (T##_f0 <= X##_f0) \ |
| { \ |
| S##_f0 = T##_f0 + (q); \ |
| X##_f0 -= T##_f0; \ |
| R##_f0 += (q); \ |
| } \ |
| _FP_FRAC_SLL_1 (X, 1); \ |
| (q) >>= 1; \ |
| } \ |
| _FP_FRAC_SLL_2 (R, (_FP_WORKBITS)); \ |
| if (X##_f0) \ |
| { \ |
| if (S##_f0 < X##_f0) \ |
| R##_f0 |= _FP_WORK_ROUND; \ |
| R##_f0 |= _FP_WORK_STICKY; \ |
| } \ |
| } \ |
| while (0) |
| |
| # define FP_CMP_E(r, X, Y, un, ex) _FP_CMP (E, 2, (r), X, Y, (un), (ex)) |
| # define FP_CMP_EQ_E(r, X, Y, ex) _FP_CMP_EQ (E, 2, (r), X, Y, (ex)) |
| # define FP_CMP_UNORD_E(r, X, Y, ex) _FP_CMP_UNORD (E, 2, (r), X, Y, (ex)) |
| |
| # define FP_TO_INT_E(r, X, rsz, rsg) _FP_TO_INT (E, 2, (r), X, (rsz), (rsg)) |
| # define FP_TO_INT_ROUND_E(r, X, rsz, rsg) \ |
| _FP_TO_INT_ROUND (E, 2, (r), X, (rsz), (rsg)) |
| # define FP_FROM_INT_E(X, r, rs, rt) _FP_FROM_INT (E, 2, X, (r), (rs), rt) |
| |
| # define _FP_FRAC_HIGH_E(X) (X##_f1) |
| # define _FP_FRAC_HIGH_RAW_E(X) (X##_f0) |
| |
| # define _FP_FRAC_HIGH_DW_E(X) (X##_f[2]) |
| |
| #endif /* not _FP_W_TYPE_SIZE < 64 */ |
| |
| #endif /* !SOFT_FP_EXTENDED_H */ |