libgfortran: Use __builtin_issignaling in libgfortran [PR105105]
The following patch makes use of the new __builtin_issignaling, so it no longer needs the fallback implementation and can use the builtin even where glibc provides the macro. 2022-08-26 Jakub Jelinek <jakub@redhat.com> PR fortran/105105 * ieee/ieee_helper.c: Don't include issignaling_fallback.h. (CLASSMACRO): Use __builtin_issignaling instead of issignaling. * ieee/issignaling_fallback.h: Removed.
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Jakub Jelinek
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0982edd371
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387e6f1570
2 changed files with 1 additions and 259 deletions
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@ -26,13 +26,6 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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#include "libgfortran.h"
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/* Check support for issignaling macro. If not, we include our own
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fallback implementation. */
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#ifndef issignaling
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# include "issignaling_fallback.h"
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#endif
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/* Prototypes. */
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extern int ieee_class_helper_4 (GFC_REAL_4 *);
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@ -94,7 +87,7 @@ enum {
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\
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if (res == IEEE_QUIET_NAN) \
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{ \
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if (issignaling (*value)) \
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if (__builtin_issignaling (*value)) \
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return IEEE_SIGNALING_NAN; \
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else \
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return IEEE_QUIET_NAN; \
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@ -1,251 +0,0 @@
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/* Fallback implementation of issignaling macro.
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Copyright (C) 2022 Free Software Foundation, Inc.
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Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran 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
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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/* This header provides an implementation of the type-generic issignaling macro.
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Some points of note:
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- This header is only included if the issignaling macro is not defined.
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- All targets for which Fortran IEEE modules are supported currently have
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the high-order bit of the NaN mantissa clear for signaling (and set
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for quiet), as recommended by IEEE.
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- We use the __*_IS_IEC_60559__ macros to make sure we only deal with formats
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we know. For other floating-point formats, we consider all NaNs as quiet.
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*/
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typedef union
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{
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float value;
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uint32_t word;
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} ieee_float_shape_type;
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static inline int
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__issignalingf (float x)
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{
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#if __FLT_IS_IEC_60559__
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uint32_t xi;
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ieee_float_shape_type u;
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u.value = x;
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xi = u.word;
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xi ^= 0x00400000;
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return (xi & 0x7fffffff) > 0x7fc00000;
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#else
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return 0;
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#endif
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}
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typedef union
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{
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double value;
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uint64_t word;
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} ieee_double_shape_type;
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static inline int
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__issignaling (double x)
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{
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#if __DBL_IS_IEC_60559__
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ieee_double_shape_type u;
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uint64_t xi;
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u.value = x;
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xi = u.word;
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xi ^= UINT64_C (0x0008000000000000);
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return (xi & UINT64_C (0x7fffffffffffffff)) > UINT64_C (0x7ff8000000000000);
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#else
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return 0;
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#endif
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}
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#if __LDBL_DIG__ == __DBL_DIG__
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/* Long double is the same as double. */
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static inline int
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__issignalingl (long double x)
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{
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return __issignaling (x);
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}
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#elif (__LDBL_DIG__ == 18) && __LDBL_IS_IEC_60559__
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/* Long double is x86 extended type. */
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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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#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__
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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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#elif __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__
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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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#endif
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} parts;
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} ieee_long_double_shape_type;
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static inline int
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__issignalingl (long double x)
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{
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int ret;
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uint32_t exi, hxi, lxi;
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ieee_long_double_shape_type u;
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u.value = x;
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exi = u.parts.sign_exponent;
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hxi = u.parts.msw;
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lxi = u.parts.lsw;
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/* Pseudo numbers on x86 are always signaling. */
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ret = (exi & 0x7fff) && ((hxi & 0x80000000) == 0);
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hxi ^= 0x40000000;
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hxi |= (lxi | -lxi) >> 31;
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return ret || (((exi & 0x7fff) == 0x7fff) && (hxi > 0xc0000000));
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}
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#elif (__LDBL_DIG__ == 31)
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/* Long double is 128-bit IBM extended type. */
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static inline int
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__issignalingl (long double x)
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{
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union { long double value; double parts[2]; } u;
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u.value = x;
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return __issignaling (u.parts[0]);
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}
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#elif (__LDBL_DIG__ == 33) && __LDBL_IS_IEC_60559__
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/* Long double is 128-bit type. */
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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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#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__
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uint64_t msw;
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uint64_t lsw;
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#elif __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__
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uint64_t lsw;
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uint64_t msw;
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#endif
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} parts64;
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} ieee854_long_double_shape_type;
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static inline int
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__issignalingl (long double x)
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{
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uint64_t hxi, lxi;
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ieee854_long_double_shape_type u;
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u.value = x;
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hxi = u.parts64.msw;
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lxi = u.parts64.lsw;
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hxi ^= UINT64_C (0x0000800000000000);
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hxi |= (lxi | -lxi) >> 63;
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return (hxi & UINT64_C (0x7fffffffffffffff)) > UINT64_C (0x7fff800000000000);
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}
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#else
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static inline int
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__issignalingl (long double x)
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{
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return 0;
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}
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#endif
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#if defined(GFC_REAL_16_IS_FLOAT128)
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/* We have a _Float128 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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{
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#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__
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uint64_t msw;
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uint64_t lsw;
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#elif __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__
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uint64_t lsw;
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uint64_t msw;
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#endif
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} parts64;
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} ieee854_float128_shape_type;
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static inline int
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__issignalingf128 (_Float128 x)
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{
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uint64_t hxi, lxi;
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ieee854_float128_shape_type u;
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u.value = x;
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hxi = u.parts64.msw;
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lxi = u.parts64.lsw;
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hxi ^= UINT64_C (0x0000800000000000);
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hxi |= (lxi | -lxi) >> 63;
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return (hxi & UINT64_C (0x7fffffffffffffff)) > UINT64_C (0x7fff800000000000);
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}
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#endif
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/* Define the type-generic macro based on the functions above. */
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#if defined(GFC_REAL_16_IS_FLOAT128)
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# define issignaling(X) \
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_Generic ((X), \
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_Float128: __issignalingf128, \
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float: __issignalingf, \
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double: __issignaling, \
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long double: __issignalingl)(X)
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#else
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# define issignaling(X) \
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_Generic ((X), \
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float: __issignalingf, \
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double: __issignaling, \
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long double: __issignalingl)(X)
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#endif
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