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The implementations are contained with sysdeps/ieee754/float128 as they are only built when _Float128 is enabled within libc/m. * include/gmp.h (__mpn_construct_float128): New declaration. * include/stdlib.h: Include bits/floatn.h for _Float128 tests. (__strtof128_l): New declaration. (__strtof128_nan): Likewise. (__wcstof128_nan): Likewise. (__strtof128_internal): Likewise. (____strtof128_l_internal): Likewise. * include/wchar.h: Include bits/floatn.h for _Float128 tests. (__wcstof128_l): New declaration. (__wcstof128_internal): Likewise. * stdlib/Makefile (bug-strtod2): Link libm too. * stdlib/stdlib.h (strtof128): New declaration. (strtof128_l): Likewise. * stdlib/tst-strtod-nan-locale-main.c: Updated to use tst-strtod.h macros to ensure float128 gets tested too. * stdlib/tst-strtod-round-skeleton.c (CHOOSE_f128): New macro. * stdlib/tst-strtod.h: Include bits/floatn.h for _Float128 tests. (IF_FLOAT128): New macro. (GEN_TEST_STRTOD): Update to optionally include _Float128 in the tests. (STRTOD_TEST_FOREACH): Likewise. * sysdeps/ieee754/float128/Makefile: Insert new strtof128 and wcstof128 functions into libc. * sysdeps/ieee754/float128/Versions: Add exports for the above new functions. * sysdeps/ieee754/float128/mpn2float128.c: New file. * sysdeps/ieee754/float128/strtod_nan_float128.h: New file. * sysdeps/ieee754/float128/strtof128.c: New file. * sysdeps/ieee754/float128/strtof128_l.c: New file. * sysdeps/ieee754/float128/strtof128_nan.c: New file. * sysdeps/ieee754/float128/wcstof128.c: New file. * sysdeps/ieee754/float128/wcstof128_l.c: New file. * sysdeps/ieee754/float128/wcstof128_nan.c: New fike. * wcsmbs/Makefile: (CFLAGS-wcstof128.c): Append strtox-CFLAGS. (CFLAGS-wcstof128_l): Likewise. * wcsmbs/wchar.h: Include bits/floatn.h for _Float128 tests. (wcstof128): New declaration. (wcstof128_l): Likewise.
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* Convert a number in multi-precision format to _Float128.
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Copyright (C) 2017 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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#include "gmp.h"
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#include "gmp-impl.h"
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#include <float.h>
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#include <math.h>
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#include "ieee754_float128.h"
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/* Convert a multi-precision integer of the needed number of bits (113 for
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binary128) and an integral power of two to a `_Float128' in IEEE854
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quad-precision format. */
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_Float128
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__mpn_construct_float128 (mp_srcptr frac_ptr, int expt, int sign)
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{
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union ieee854_float128 u;
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u.ieee.negative = sign;
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u.ieee.exponent = expt + IEEE854_FLOAT128_BIAS;
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#if BITS_PER_MP_LIMB == 32
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u.ieee.mantissa3 = frac_ptr[0];
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u.ieee.mantissa2 = frac_ptr[1];
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u.ieee.mantissa1 = frac_ptr[2];
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u.ieee.mantissa0 = frac_ptr[3] & (((mp_limb_t) 1
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<< (FLT128_MANT_DIG - 96)) - 1);
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#elif BITS_PER_MP_LIMB == 64
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u.ieee.mantissa3 = frac_ptr[0] & (((mp_limb_t) 1 << 32) - 1);
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u.ieee.mantissa2 = frac_ptr[0] >> 32;
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u.ieee.mantissa1 = frac_ptr[1] & (((mp_limb_t) 1 << 32) - 1);
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u.ieee.mantissa0 = (frac_ptr[1] >> 32) & (((mp_limb_t) 1
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<< (FLT128_MANT_DIG - 96)) - 1);
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#else
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#error "mp_limb size " BITS_PER_MP_LIMB "not accounted for"
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#endif
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return u.d;
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}
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