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3021e78178
This patch adds IEEE long double versions of q*cvt* functions for
powerpc64le. Unlike all other long double to/from string conversion
functions, these do not rely on internal functions that can take
floating-point numbers with different formats and act on them
accordingly, instead, the related files are rebuilt with the
-mabi=ieeelongdouble compiler flag set.
Having -mabi=ieeelongdouble passed to the compiler causes the object
files to be marked with a .gnu_attribute that is incompatible with the
.gnu_attribute in files built with -mabi=ibmlongdouble (the default).
The difference causes error messages similar to the following:
ld: libc_pic.a(s_isinfl.os) uses IBM long double,
libc_pic.a(ieee128-qefgcvt_r.os) uses IEEE long double.
collect2: error: ld returned 1 exit status
make[2]: *** [../Makerules:649: libc_pic.os] Error 1
Although this warning is useful in other situations, the library
actually needs to have functions with different long double formats, so
.gnu_attribute generation is explicitly disabled for these files with
the use of -mno-gnu-attribute.
Tested for powerpc64le on the branch that actually enables the
sysdeps/ieee754/ldbl-128ibm-compat for powerpc64le.
Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/* Compatibility functions for floating point formatting.
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Copyright (C) 1995-2019 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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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/param.h>
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#include <libc-lock.h>
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#include <math_ldbl_opt.h>
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#ifndef SPRINTF
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# define SPRINTF sprintf
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#endif
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#define APPEND(a, b) APPEND2 (a, b)
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#define APPEND2(a, b) a##b
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#define FCVT_BUFFER APPEND (FUNC_PREFIX, fcvt_buffer)
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#define FCVT_BUFPTR APPEND (FUNC_PREFIX, fcvt_bufptr)
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#define ECVT_BUFFER APPEND (FUNC_PREFIX, ecvt_buffer)
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static char FCVT_BUFFER[MAXDIG];
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static char ECVT_BUFFER[MAXDIG];
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libc_freeres_ptr (static char *FCVT_BUFPTR);
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char *
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__FCVT (FLOAT_TYPE value, int ndigit, int *decpt, int *sign)
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{
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if (FCVT_BUFPTR == NULL)
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{
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if (__FCVT_R (value, ndigit, decpt, sign, FCVT_BUFFER, MAXDIG) != -1)
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return FCVT_BUFFER;
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FCVT_BUFPTR = (char *) malloc (FCVT_MAXDIG);
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if (FCVT_BUFPTR == NULL)
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return FCVT_BUFFER;
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}
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(void) __FCVT_R (value, ndigit, decpt, sign, FCVT_BUFPTR, FCVT_MAXDIG);
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return FCVT_BUFPTR;
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}
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char *
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__ECVT (FLOAT_TYPE value, int ndigit, int *decpt, int *sign)
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{
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(void) __ECVT_R (value, ndigit, decpt, sign, ECVT_BUFFER, MAXDIG);
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return ECVT_BUFFER;
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}
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char *
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__GCVT (FLOAT_TYPE value, int ndigit, char *buf)
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{
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SPRINTF (buf, "%.*" FLOAT_FMT_FLAG "g", MIN (ndigit, NDIGIT_MAX), value);
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return buf;
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}
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