diff options
Diffstat (limited to 'sysdeps/ieee754/flt-32/math_config.h')
-rw-r--r-- | sysdeps/ieee754/flt-32/math_config.h | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/sysdeps/ieee754/flt-32/math_config.h b/sysdeps/ieee754/flt-32/math_config.h new file mode 100644 index 0000000000..9c4ef30173 --- /dev/null +++ b/sysdeps/ieee754/flt-32/math_config.h @@ -0,0 +1,164 @@ +/* Configuration for math routines. + 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 _MATH_CONFIG_H +#define _MATH_CONFIG_H + +#include <math.h> +#include <math_private.h> +#include <nan-high-order-bit.h> +#include <stdint.h> + +#ifndef WANT_ROUNDING +/* Correct special case results in non-nearest rounding modes. */ +# define WANT_ROUNDING 1 +#endif +#ifndef WANT_ERRNO +/* Set errno according to ISO C with (math_errhandling & MATH_ERRNO) != 0. */ +# define WANT_ERRNO 1 +#endif +#ifndef WANT_ERRNO_UFLOW +/* Set errno to ERANGE if result underflows to 0 (in all rounding modes). */ +# define WANT_ERRNO_UFLOW (WANT_ROUNDING && WANT_ERRNO) +#endif + +#ifndef TOINT_INTRINSICS +# define TOINT_INTRINSICS 0 +#endif +#ifndef TOINT_RINT +# define TOINT_RINT 0 +#endif +#ifndef TOINT_SHIFT +# define TOINT_SHIFT 1 +#endif + +static inline uint32_t +asuint (float f) +{ + union + { + float f; + uint32_t i; + } u = {f}; + return u.i; +} + +static inline float +asfloat (uint32_t i) +{ + union + { + uint32_t i; + float f; + } u = {i}; + return u.f; +} + +static inline uint64_t +asuint64 (double f) +{ + union + { + double f; + uint64_t i; + } u = {f}; + return u.i; +} + +static inline double +asdouble (uint64_t i) +{ + union + { + uint64_t i; + double f; + } u = {i}; + return u.f; +} + +static inline int +issignalingf_inline (float x) +{ + uint32_t ix = asuint (x); + if (HIGH_ORDER_BIT_IS_SET_FOR_SNAN) + return (ix & 0x7fc00000) == 0x7fc00000; + return 2 * (ix ^ 0x00400000) > 2u * 0x7fc00000; +} + +#define NOINLINE __attribute__ ((noinline)) + +attribute_hidden float __math_oflowf (uint32_t); +attribute_hidden float __math_uflowf (uint32_t); +attribute_hidden float __math_may_uflowf (uint32_t); +attribute_hidden float __math_divzerof (uint32_t); +attribute_hidden float __math_invalidf (float); + +/* Shared between expf, exp2f and powf. */ +#define EXP2F_TABLE_BITS 5 +#define EXP2F_POLY_ORDER 3 +extern const struct exp2f_data +{ + uint64_t tab[1 << EXP2F_TABLE_BITS]; + double shift_scaled; + double poly[EXP2F_POLY_ORDER]; + double shift; + double invln2_scaled; + double poly_scaled[EXP2F_POLY_ORDER]; +} __exp2f_data attribute_hidden; + +#define LOGF_TABLE_BITS 4 +#define LOGF_POLY_ORDER 4 +extern const struct logf_data +{ + struct + { + double invc, logc; + } tab[1 << LOGF_TABLE_BITS]; + double ln2; + double poly[LOGF_POLY_ORDER - 1]; /* First order coefficient is 1. */ +} __logf_data attribute_hidden; + +#define LOG2F_TABLE_BITS 4 +#define LOG2F_POLY_ORDER 4 +extern const struct log2f_data +{ + struct + { + double invc, logc; + } tab[1 << LOG2F_TABLE_BITS]; + double poly[LOG2F_POLY_ORDER]; +} __log2f_data attribute_hidden; + +#define POWF_LOG2_TABLE_BITS 4 +#define POWF_LOG2_POLY_ORDER 5 +#if TOINT_INTRINSICS +# define POWF_SCALE_BITS EXP2F_TABLE_BITS +#else +# define POWF_SCALE_BITS 0 +#endif +#define POWF_SCALE ((double) (1 << POWF_SCALE_BITS)) +extern const struct powf_log2_data +{ + struct + { + double invc, logc; + } tab[1 << POWF_LOG2_TABLE_BITS]; + double poly[POWF_LOG2_POLY_ORDER]; +} __powf_log2_data attribute_hidden; + +#endif |