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Diffstat (limited to 'sysdeps/ieee754/float128/ieee754_float128.h')
| -rw-r--r-- | sysdeps/ieee754/float128/ieee754_float128.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/sysdeps/ieee754/float128/ieee754_float128.h b/sysdeps/ieee754/float128/ieee754_float128.h new file mode 100644 index 0000000000..e8e7211d88 --- /dev/null +++ b/sysdeps/ieee754/float128/ieee754_float128.h @@ -0,0 +1,140 @@ +/* _Float128 IEEE like macros. + Copyright (C) 2017 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 |