667b3ec15d
This patch extends update-quadmath.py to update fmaq from glibc. The issue in that function was that quadmath-imp.h had a struct in a union with mant_high and mant_low fields (up to 64-bit) whereas glibc has mantissa0, mantissa1, mantissa2 and mantissa3 (up to 32-bit). The patch changes those fields to be the same as in glibc, moving printf / strtod code that also uses those fields back to closer to the glibc form. This allows fmaq to be updated automatically from glibc (which brings in at least one bug fix from glibc from 2015). nanq was also using the mant_high field name, and had other issues: it only partly initialized the union from which a value was returned, and setting mant_high to 1 meant a signaling NaN would be returned rather than a quiet NaN. This patch fixes those issues as part of updating it to use the changed interfaces (but does not fix the issue of not using the argument). Bootstrapped with no regressions on x86_64-pc-linux-gnu. * quadmath-imp.h (ieee854_float128): Use mantissa0, mantissa1, mantissa2 and mantissa3 fields instead of mant_high and mant_low. Change nan field to ieee_nan. * update-quadmath.py (update_sources): Also update fmaq.c. * math/nanq.c (nanq): Use ieee_nan field of union. Zero-initialize f. Set quiet_nan field. * printf/flt1282mpn.c, printf/printf_fphex.c, strtod/mpn2flt128.c, strtod/strtoflt128.c: Use mantissa0, mantissa1, mantissa2 and mantissa3 fields. Use ieee_nan and quiet_nan field. * math/fmaq.c: Regenerate from glibc sources with update-quadmath.py. From-SVN: r265874
346 lines
9.7 KiB
C
346 lines
9.7 KiB
C
/* GCC Quad-Precision Math Library
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Copyright (C) 2010, 2011 Free Software Foundation, Inc.
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Written by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
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This file is part of the libquadmath library.
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Libquadmath is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libquadmath 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libquadmath; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifndef QUADMATH_IMP_H
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#define QUADMATH_IMP_H
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#include <errno.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "quadmath.h"
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#include "config.h"
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#ifdef HAVE_FENV_H
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# include <fenv.h>
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#endif
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/* Under IEEE 754, an architecture may determine tininess of
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floating-point results either "before rounding" or "after
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rounding", but must do so in the same way for all operations
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returning binary results. Define TININESS_AFTER_ROUNDING to 1 for
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"after rounding" architectures, 0 for "before rounding"
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architectures. */
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#define TININESS_AFTER_ROUNDING 1
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#define HIGH_ORDER_BIT_IS_SET_FOR_SNAN 0
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#define FIX_FLT128_LONG_CONVERT_OVERFLOW 0
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#define FIX_FLT128_LLONG_CONVERT_OVERFLOW 0
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/* Prototypes for internal functions. */
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extern int32_t __quadmath_rem_pio2q (__float128, __float128 *);
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extern void __quadmath_kernel_sincosq (__float128, __float128, __float128 *,
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__float128 *, int);
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extern __float128 __quadmath_kernel_sinq (__float128, __float128, int);
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extern __float128 __quadmath_kernel_cosq (__float128, __float128);
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extern __float128 __quadmath_kernel_tanq (__float128, __float128, int);
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extern __float128 __quadmath_gamma_productq (__float128, __float128, int,
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__float128 *);
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extern __float128 __quadmath_gammaq_r (__float128, int *);
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extern __float128 __quadmath_lgamma_negq (__float128, int *);
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extern __float128 __quadmath_lgamma_productq (__float128, __float128,
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__float128, int);
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extern __float128 __quadmath_lgammaq_r (__float128, int *);
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extern __float128 __quadmath_x2y2m1q (__float128 x, __float128 y);
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extern __complex128 __quadmath_kernel_casinhq (__complex128, int);
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static inline void
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mul_splitq (__float128 *hi, __float128 *lo, __float128 x, __float128 y)
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{
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/* Fast built-in fused multiply-add. */
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*hi = x * y;
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*lo = fmaq (x, y, -*hi);
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}
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/* Frankly, if you have __float128, you have 64-bit integers, right? */
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#ifndef UINT64_C
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# error "No way!"
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#endif
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/* Main union type we use to manipulate the floating-point type. */
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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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#ifdef __MINGW32__
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/* On mingw targets the ms-bitfields option is active by default.
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Therefore enforce gnu-bitfield style. */
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__attribute__ ((gcc_struct))
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#endif
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{
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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unsigned negative:1;
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unsigned exponent:15;
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unsigned mantissa0:16;
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unsigned mantissa1:32;
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unsigned mantissa2:32;
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unsigned mantissa3:32;
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#else
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unsigned mantissa3:32;
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unsigned mantissa2:32;
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unsigned mantissa1:32;
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unsigned mantissa0:16;
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unsigned exponent:15;
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unsigned negative:1;
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#endif
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} ieee;
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struct
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{
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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uint64_t high;
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uint64_t low;
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#else
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uint64_t low;
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uint64_t high;
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#endif
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} words64;
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struct
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{
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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uint32_t w0;
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uint32_t w1;
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uint32_t w2;
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uint32_t w3;
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#else
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uint32_t w3;
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uint32_t w2;
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uint32_t w1;
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uint32_t w0;
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#endif
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} words32;
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struct
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#ifdef __MINGW32__
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/* Make sure we are using gnu-style bitfield handling. */
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__attribute__ ((gcc_struct))
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#endif
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{
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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unsigned negative:1;
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unsigned exponent:15;
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unsigned quiet_nan:1;
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unsigned mantissa0:15;
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unsigned mantissa1:32;
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unsigned mantissa2:32;
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unsigned mantissa3:32;
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#else
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unsigned mantissa3:32;
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unsigned mantissa2:32;
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unsigned mantissa1:32;
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unsigned mantissa0:15;
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unsigned quiet_nan:1;
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unsigned exponent:15;
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unsigned negative:1;
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#endif
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} ieee_nan;
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} ieee854_float128;
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/* Get two 64 bit ints from a long double. */
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#define GET_FLT128_WORDS64(ix0,ix1,d) \
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do { \
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ieee854_float128 u; \
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u.value = (d); \
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(ix0) = u.words64.high; \
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(ix1) = u.words64.low; \
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} while (0)
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/* Set a long double from two 64 bit ints. */
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#define SET_FLT128_WORDS64(d,ix0,ix1) \
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do { \
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ieee854_float128 u; \
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u.words64.high = (ix0); \
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u.words64.low = (ix1); \
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(d) = u.value; \
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} while (0)
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/* Get the more significant 64 bits of a long double mantissa. */
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#define GET_FLT128_MSW64(v,d) \
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do { \
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ieee854_float128 u; \
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u.value = (d); \
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(v) = u.words64.high; \
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} while (0)
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/* Set the more significant 64 bits of a long double mantissa from an int. */
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#define SET_FLT128_MSW64(d,v) \
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do { \
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ieee854_float128 u; \
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u.value = (d); \
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u.words64.high = (v); \
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(d) = u.value; \
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} while (0)
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/* Get the least significant 64 bits of a long double mantissa. */
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#define GET_FLT128_LSW64(v,d) \
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do { \
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ieee854_float128 u; \
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u.value = (d); \
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(v) = u.words64.low; \
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} while (0)
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#define IEEE854_FLOAT128_BIAS 0x3fff
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#define QUADFP_NAN 0
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#define QUADFP_INFINITE 1
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#define QUADFP_ZERO 2
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#define QUADFP_SUBNORMAL 3
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#define QUADFP_NORMAL 4
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#define fpclassifyq(x) \
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__builtin_fpclassify (QUADFP_NAN, QUADFP_INFINITE, QUADFP_NORMAL, \
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QUADFP_SUBNORMAL, QUADFP_ZERO, x)
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#ifndef math_opt_barrier
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# define math_opt_barrier(x) \
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({ __typeof (x) __x = (x); __asm ("" : "+m" (__x)); __x; })
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# define math_force_eval(x) \
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({ __typeof (x) __x = (x); __asm __volatile__ ("" : : "m" (__x)); })
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#endif
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/* math_narrow_eval reduces its floating-point argument to the range
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and precision of its semantic type. (The original evaluation may
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still occur with excess range and precision, so the result may be
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affected by double rounding.) */
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#define math_narrow_eval(x) (x)
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/* If X (which is not a NaN) is subnormal, force an underflow
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exception. */
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#define math_check_force_underflow(x) \
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do \
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{ \
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__float128 force_underflow_tmp = (x); \
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if (fabsq (force_underflow_tmp) < FLT128_MIN) \
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{ \
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__float128 force_underflow_tmp2 \
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= force_underflow_tmp * force_underflow_tmp; \
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math_force_eval (force_underflow_tmp2); \
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} \
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} \
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while (0)
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/* Likewise, but X is also known to be nonnegative. */
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#define math_check_force_underflow_nonneg(x) \
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do \
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{ \
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__float128 force_underflow_tmp = (x); \
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if (force_underflow_tmp < FLT128_MIN) \
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{ \
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__float128 force_underflow_tmp2 \
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= force_underflow_tmp * force_underflow_tmp; \
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math_force_eval (force_underflow_tmp2); \
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} \
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} \
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while (0)
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/* Likewise, for both real and imaginary parts of a complex
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result. */
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#define math_check_force_underflow_complex(x) \
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do \
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{ \
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__typeof (x) force_underflow_complex_tmp = (x); \
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math_check_force_underflow (__real__ force_underflow_complex_tmp); \
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math_check_force_underflow (__imag__ force_underflow_complex_tmp); \
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} \
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while (0)
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#ifndef HAVE_FENV_H
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# define feraiseexcept(arg) ((void) 0)
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typedef int fenv_t;
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# define feholdexcept(arg) ((void) 0)
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# define fesetround(arg) ((void) 0)
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# define feupdateenv(arg) ((void) (arg))
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# define fesetenv(arg) ((void) (arg))
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# define fetestexcept(arg) 0
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# define feclearexcept(arg) ((void) 0)
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#else
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# ifndef HAVE_FEHOLDEXCEPT
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# define feholdexcept(arg) ((void) 0)
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# endif
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# ifndef HAVE_FESETROUND
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# define fesetround(arg) ((void) 0)
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# endif
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# ifndef HAVE_FEUPDATEENV
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# define feupdateenv(arg) ((void) (arg))
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# endif
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# ifndef HAVE_FESETENV
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# define fesetenv(arg) ((void) (arg))
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# endif
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# ifndef HAVE_FETESTEXCEPT
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# define fetestexcept(arg) 0
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# endif
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#endif
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#ifndef __glibc_likely
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# define __glibc_likely(cond) __builtin_expect ((cond), 1)
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#endif
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#ifndef __glibc_unlikely
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# define __glibc_unlikely(cond) __builtin_expect ((cond), 0)
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#endif
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#if defined HAVE_FENV_H && defined HAVE_FESETROUND && defined HAVE_FEUPDATEENV
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struct rm_ctx
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{
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fenv_t env;
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bool updated_status;
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};
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# define SET_RESTORE_ROUNDF128(RM) \
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struct rm_ctx ctx __attribute__((cleanup (libc_feresetround_ctx))); \
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libc_feholdsetround_ctx (&ctx, (RM))
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static inline __attribute__ ((always_inline)) void
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libc_feholdsetround_ctx (struct rm_ctx *ctx, int round)
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{
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ctx->updated_status = false;
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/* Update rounding mode only if different. */
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if (__glibc_unlikely (round != fegetround ()))
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{
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ctx->updated_status = true;
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fegetenv (&ctx->env);
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fesetround (round);
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}
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}
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static inline __attribute__ ((always_inline)) void
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libc_feresetround_ctx (struct rm_ctx *ctx)
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{
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/* Restore the rounding mode if updated. */
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if (__glibc_unlikely (ctx->updated_status))
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feupdateenv (&ctx->env);
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}
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#else
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# define SET_RESTORE_ROUNDF128(RM) ((void) 0)
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#endif
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#endif
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