121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/* Manipulation of the bit representation of 'long double' quantities.
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Copyright (C) 1999-2022 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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<https://www.gnu.org/licenses/>. */
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#ifndef _MATH_LDBL_H_
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#define _MATH_LDBL_H_ 1
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#include <stdint.h>
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#include <endian.h>
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/* A union which permits us to convert between a long double and
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three 32 bit ints. */
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#if __FLOAT_WORD_ORDER == __BIG_ENDIAN
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typedef union
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{
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long double value;
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struct
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{
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int sign_exponent:16;
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unsigned int empty:16;
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uint32_t msw;
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uint32_t lsw;
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} parts;
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} ieee_long_double_shape_type;
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#endif
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#if __FLOAT_WORD_ORDER == __LITTLE_ENDIAN
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typedef union
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{
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long double value;
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struct
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{
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uint32_t lsw;
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uint32_t msw;
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int sign_exponent:16;
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unsigned int empty:16;
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} parts;
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} ieee_long_double_shape_type;
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#endif
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/* Get three 32 bit ints from a double. */
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#define GET_LDOUBLE_WORDS(exp,ix0,ix1,d) \
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do { \
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ieee_long_double_shape_type ew_u; \
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ew_u.value = (d); \
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(exp) = ew_u.parts.sign_exponent; \
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(ix0) = ew_u.parts.msw; \
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(ix1) = ew_u.parts.lsw; \
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} while (0)
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/* Set a double from two 32 bit ints. */
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#define SET_LDOUBLE_WORDS(d,exp,ix0,ix1) \
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do { \
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ieee_long_double_shape_type iw_u; \
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iw_u.parts.sign_exponent = (exp); \
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iw_u.parts.msw = (ix0); \
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iw_u.parts.lsw = (ix1); \
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(d) = iw_u.value; \
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} while (0)
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/* Get the more significant 32 bits of a long double mantissa. */
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#define GET_LDOUBLE_MSW(v,d) \
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do { \
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ieee_long_double_shape_type sh_u; \
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sh_u.value = (d); \
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(v) = sh_u.parts.msw; \
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} while (0)
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/* Set the more significant 32 bits of a long double mantissa from an int. */
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#define SET_LDOUBLE_MSW(d,v) \
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do { \
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ieee_long_double_shape_type sh_u; \
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sh_u.value = (d); \
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sh_u.parts.msw = (v); \
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(d) = sh_u.value; \
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} while (0)
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/* Get int from the exponent of a long double. */
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#define GET_LDOUBLE_EXP(exp,d) \
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do { \
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ieee_long_double_shape_type ge_u; \
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ge_u.value = (d); \
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(exp) = ge_u.parts.sign_exponent; \
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} while (0)
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/* Set exponent of a long double from an int. */
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#define SET_LDOUBLE_EXP(d,exp) \
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do { \
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ieee_long_double_shape_type se_u; \
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se_u.value = (d); \
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se_u.parts.sign_exponent = (exp); \
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(d) = se_u.value; \
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} while (0)
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#endif /* math_ldbl.h */
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