| /* _Float128 IEEE like macros. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| 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. |
| |
| 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 _IEEE754_FLOAT128_H |
| #define _IEEE754_FLOAT128_H |
| |
| #include <endian.h> |
| #include <stdint.h> |
| |
| # if __FLOAT_WORD_ORDER == BIG_ENDIAN |
| # define __FLT_EORDER2(t, a, b) t a; t b; |
| # define __FLT_EORDER4(t, a, b, c, d) \ |
| t a; t b; t c; t d; |
| # define __FLT_EORDER6(t, a, b, c, d, e, f) \ |
| t a; t b; t c; t d; t e; t f; |
| # define __FLT_EORDER7(t, a, b, c, d, e, f, g) \ |
| t a; t b; t c; t d; t e; t f; t g; |
| # else |
| # define __FLT_EORDER2(t, a, b) \ |
| t b; t a; |
| # define __FLT_EORDER4(t, a, b, c, d) \ |
| t d; t c; t b; t a; |
| # define __FLT_EORDER6(t, a, b, c, d, e, f) \ |
| t f; t e; t d; t c; t b; t a; |
| # define __FLT_EORDER7(t, a, b, c, d, e, f, g) \ |
| t g; t f; t e; t d; t c; t b; t a; |
| # endif |
| |
| /* A union which permits us to convert between _Float128 and |
| four 32 bit ints or two 64 bit ints. */ |
| |
| typedef union |
| { |
| _Float128 value; |
| struct |
| { |
| __FLT_EORDER2 (uint64_t, msw, lsw); |
| } parts64; |
| struct |
| { |
| __FLT_EORDER4 (uint32_t, w0, w1, w2, w3); |
| } parts32; |
| } ieee854_float128_shape_type; |
| |
| /* Get two 64 bit ints from a _Float128. */ |
| |
| # define GET_FLOAT128_WORDS64(ix0,ix1,d) \ |
| do { \ |
| ieee854_float128_shape_type qw_u; \ |
| qw_u.value = (d); \ |
| (ix0) = qw_u.parts64.msw; \ |
| (ix1) = qw_u.parts64.lsw; \ |
| } while (0) |
| |
| /* Set a _Float128 from two 64 bit ints. */ |
| |
| # define SET_FLOAT128_WORDS64(d,ix0,ix1) \ |
| do { \ |
| ieee854_float128_shape_type qw_u; \ |
| qw_u.parts64.msw = (ix0); \ |
| qw_u.parts64.lsw = (ix1); \ |
| (d) = qw_u.value; \ |
| } while (0) |
| |
| /* Get the more significant 64 bits of a _Float128 mantissa. */ |
| |
| # define GET_FLOAT128_MSW64(v,d) \ |
| do { \ |
| ieee854_float128_shape_type sh_u; \ |
| sh_u.value = (d); \ |
| (v) = sh_u.parts64.msw; \ |
| } while (0) |
| |
| /* Set the more significant 64 bits of a _Float128 mantissa from an int. */ |
| |
| # define SET_FLOAT128_MSW64(d,v) \ |
| do { \ |
| ieee854_float128_shape_type sh_u; \ |
| sh_u.value = (d); \ |
| sh_u.parts64.msw = (v); \ |
| (d) = sh_u.value; \ |
| } while (0) |
| |
| /* Get the least significant 64 bits of a _Float128 mantissa. */ |
| |
| # define GET_FLOAT128_LSW64(v,d) \ |
| do { \ |
| ieee854_float128_shape_type sh_u; \ |
| sh_u.value = (d); \ |
| (v) = sh_u.parts64.lsw; \ |
| } while (0) |
| |
| /* Likewise, some helper macros which are exposed via ieee754.h for |
| C99 real types, but not _Float128. */ |
| |
| union ieee854_float128 |
| { |
| _Float128 d; |
| |
| /* This is the IEEE 854 quad-precision format. */ |
| struct |
| { |
| __FLT_EORDER6 (unsigned int, negative:1, |
| exponent:15, |
| mantissa0:16, |
| mantissa1:32, |
| mantissa2:32, |
| mantissa3:32) |
| } ieee; |
| |
| /* This format makes it easier to see if a NaN is a signalling NaN. */ |
| struct |
| { |
| __FLT_EORDER7 (unsigned int, negative:1, |
| exponent:15, |
| quiet_nan:1, |
| mantissa0:15, |
| mantissa1:32, |
| mantissa2:32, |
| mantissa3:32) |
| } ieee_nan; |
| }; |
| |
| #define IEEE854_FLOAT128_BIAS 0x3fff /* Added to exponent. */ |
| |
| #endif |