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c75772e3f0
On platforms where long double used to have the same format as double, but later switched to a different format (alpha, s390, sparc, and powerpc), accessing the older behavior is possible and it happens via __nldbl_* functions (not on the API, but accessible from header redirection and from compat symbols). These functions write to the global flag __ldbl_is_dbl, which tells other functions that long double variables should be handled as double. This patch takes the first step towards removing this global flag and creates __vstrfmon_l_internal, which takes an explicit flags parameter. This change arguably makes the generated code slightly worse on architectures where __ldbl_is_dbl is never true; right now, on those architectures, it's a compile-time constant; after this change, the compiler could theoretically prove that __vstrfmon_l_internal was never called with a nonzero flags argument, but it would probably need LTO to do it. This is not performance critical code and I tend to think that the maintainability benefits of removing action at a distance are worth it. However, we _could_ wrap the runtime flag check with a macro that was defined to ignore its argument and always return false on architectures where __ldbl_is_dbl is never true, if people think the codegen benefits are important. Tested for powerpc and powerpc64le.
118 lines
4.1 KiB
C
118 lines
4.1 KiB
C
/* Prototypes for compatibility double == long double entry points.
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Copyright (C) 2006-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@cygnus.com>, 2006.
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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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#ifndef __NLDBL_COMPAT_H
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#define __NLDBL_COMPAT_H 1
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/* Ensure calls to libm functions from libnldbl_nonshared.a call
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public names, not libm-internal names. */
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#define NO_MATH_REDIRECT
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/* Avoid long double prototypes. */
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#define __NO_LONG_DOUBLE_MATH 1
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <printf.h>
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#include <wchar.h>
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#include <math.h>
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#include <monetary.h>
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#include <sys/syslog.h>
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/* Declare the __nldbl_NAME function the wrappers call that's in libc.so. */
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#define NLDBL_DECL(name) extern __typeof (name) __nldbl_##name
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NLDBL_DECL (_IO_vfscanf);
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NLDBL_DECL (vfscanf);
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NLDBL_DECL (vfwscanf);
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NLDBL_DECL (obstack_vprintf);
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NLDBL_DECL (vasprintf);
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NLDBL_DECL (dprintf);
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NLDBL_DECL (vdprintf);
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NLDBL_DECL (fprintf);
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NLDBL_DECL (vfprintf);
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NLDBL_DECL (vfwprintf);
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NLDBL_DECL (vsnprintf);
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NLDBL_DECL (vsprintf);
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NLDBL_DECL (vsscanf);
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NLDBL_DECL (vswprintf);
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NLDBL_DECL (vswscanf);
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NLDBL_DECL (__asprintf);
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NLDBL_DECL (asprintf);
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NLDBL_DECL (__printf_fp);
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NLDBL_DECL (printf_size);
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NLDBL_DECL (syslog);
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NLDBL_DECL (vsyslog);
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NLDBL_DECL (qecvt);
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NLDBL_DECL (qfcvt);
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NLDBL_DECL (qgcvt);
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NLDBL_DECL (__isoc99_scanf);
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NLDBL_DECL (__isoc99_fscanf);
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NLDBL_DECL (__isoc99_sscanf);
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NLDBL_DECL (__isoc99_vscanf);
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NLDBL_DECL (__isoc99_vfscanf);
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NLDBL_DECL (__isoc99_vsscanf);
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NLDBL_DECL (__isoc99_wscanf);
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NLDBL_DECL (__isoc99_fwscanf);
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NLDBL_DECL (__isoc99_swscanf);
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NLDBL_DECL (__isoc99_vwscanf);
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NLDBL_DECL (__isoc99_vfwscanf);
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NLDBL_DECL (__isoc99_vswscanf);
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/* These do not exist in the normal interface, but must exist in the
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__nldbl interface so that they can be called from libnldbl. */
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extern ssize_t __nldbl___vstrfmon (char *, size_t, const char *, va_list)
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__THROW;
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extern ssize_t __nldbl___vstrfmon_l (char *, size_t, locale_t, const char *,
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va_list)
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__THROW;
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/* These don't use __typeof because they were not declared by the headers,
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since we don't compile with _FORTIFY_SOURCE. */
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extern int __nldbl___vfprintf_chk (FILE *__restrict, int,
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const char *__restrict, __gnuc_va_list);
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extern int __nldbl___vfwprintf_chk (FILE *__restrict, int,
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const wchar_t *__restrict, __gnuc_va_list);
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extern int __nldbl___vsprintf_chk (char *__restrict, int, size_t,
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const char *__restrict, __gnuc_va_list)
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__THROW;
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extern int __nldbl___vsnprintf_chk (char *__restrict, size_t, int, size_t,
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const char *__restrict, __gnuc_va_list)
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__THROW;
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extern int __nldbl___vswprintf_chk (wchar_t *__restrict, size_t, int, size_t,
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const wchar_t *__restrict, __gnuc_va_list)
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__THROW;
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extern int __nldbl___vasprintf_chk (char **, int, const char *, __gnuc_va_list)
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__THROW;
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extern int __nldbl___vdprintf_chk (int, int, const char *, __gnuc_va_list);
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extern int __nldbl___obstack_vprintf_chk (struct obstack *, int, const char *,
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__gnuc_va_list) __THROW;
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extern void __nldbl___vsyslog_chk (int, int, const char *, va_list);
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/* The original declarations of these were hidden by the including
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file. */
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extern double __nldbl_daddl (double, double) __THROW;
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extern double __nldbl_ddivl (double, double) __THROW;
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extern double __nldbl_dmull (double, double) __THROW;
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extern double __nldbl_dsubl (double, double) __THROW;
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#endif /* __NLDBL_COMPAT_H */
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