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141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/* _Float128 IEEE like macros.
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _IEEE754_FLOAT128_H
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#define _IEEE754_FLOAT128_H
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#include <endian.h>
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#include <stdint.h>
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# if __FLOAT_WORD_ORDER == BIG_ENDIAN
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# define __FLT_EORDER2(t, a, b) t a; t b;
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# define __FLT_EORDER4(t, a, b, c, d) \
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t a; t b; t c; t d;
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# define __FLT_EORDER6(t, a, b, c, d, e, f) \
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t a; t b; t c; t d; t e; t f;
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# define __FLT_EORDER7(t, a, b, c, d, e, f, g) \
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t a; t b; t c; t d; t e; t f; t g;
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# else
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# define __FLT_EORDER2(t, a, b) \
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t b; t a;
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# define __FLT_EORDER4(t, a, b, c, d) \
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t d; t c; t b; t a;
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# define __FLT_EORDER6(t, a, b, c, d, e, f) \
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t f; t e; t d; t c; t b; t a;
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# define __FLT_EORDER7(t, a, b, c, d, e, f, g) \
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t g; t f; t e; t d; t c; t b; t a;
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# endif
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/* A union which permits us to convert between _Float128 and
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four 32 bit ints or two 64 bit ints. */
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typedef union
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{
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_Float128 value;
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struct
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{
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__FLT_EORDER2 (uint64_t, msw, lsw);
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} parts64;
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struct
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{
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__FLT_EORDER4 (uint32_t, w0, w1, w2, w3);
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} parts32;
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} ieee854_float128_shape_type;
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/* Get two 64 bit ints from a _Float128. */
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# define GET_FLOAT128_WORDS64(ix0,ix1,d) \
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do { \
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ieee854_float128_shape_type qw_u; \
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qw_u.value = (d); \
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(ix0) = qw_u.parts64.msw; \
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(ix1) = qw_u.parts64.lsw; \
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} while (0)
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/* Set a _Float128 from two 64 bit ints. */
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# define SET_FLOAT128_WORDS64(d,ix0,ix1) \
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do { \
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ieee854_float128_shape_type qw_u; \
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qw_u.parts64.msw = (ix0); \
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qw_u.parts64.lsw = (ix1); \
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(d) = qw_u.value; \
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} while (0)
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/* Get the more significant 64 bits of a _Float128 mantissa. */
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# define GET_FLOAT128_MSW64(v,d) \
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do { \
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ieee854_float128_shape_type sh_u; \
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sh_u.value = (d); \
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(v) = sh_u.parts64.msw; \
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} while (0)
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/* Set the more significant 64 bits of a _Float128 mantissa from an int. */
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# define SET_FLOAT128_MSW64(d,v) \
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do { \
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ieee854_float128_shape_type sh_u; \
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sh_u.value = (d); \
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sh_u.parts64.msw = (v); \
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(d) = sh_u.value; \
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} while (0)
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/* Get the least significant 64 bits of a _Float128 mantissa. */
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# define GET_FLOAT128_LSW64(v,d) \
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do { \
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ieee854_float128_shape_type sh_u; \
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sh_u.value = (d); \
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(v) = sh_u.parts64.lsw; \
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} while (0)
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/* Likewise, some helper macros which are exposed via ieee754.h for
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C99 real types, but not _Float128. */
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union ieee854_float128
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{
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_Float128 d;
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/* This is the IEEE 854 quad-precision format. */
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struct
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{
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__FLT_EORDER6 (unsigned int, negative:1,
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exponent:15,
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mantissa0:16,
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mantissa1:32,
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mantissa2:32,
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mantissa3:32)
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} ieee;
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/* This format makes it easier to see if a NaN is a signalling NaN. */
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struct
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{
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__FLT_EORDER7 (unsigned int, negative:1,
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exponent:15,
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quiet_nan:1,
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mantissa0:15,
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mantissa1:32,
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mantissa2:32,
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mantissa3:32)
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} ieee_nan;
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};
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#define IEEE854_FLOAT128_BIAS 0x3fff /* Added to exponent. */
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#endif
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