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Hash :
b1fcec6d
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Date :
2025-09-10T23:22:53
Remove support for IRIX. * all-modules: Update comments. * build-aux/install-reloc: Likewise. * build-aux/reloc-ldflags: Likewise. * gnulib-tool: Likewise. * gnulib-tool.py: Likewise. * gnulib-tool.sh: Likewise. * lib/aligned-malloc.h: Likewise. * lib/boot-time.c: Likewise. * lib/c32is-impl.h: Likewise. * lib/c32srtombs-state.c: Likewise. * lib/c32to-impl.h: Likewise. * lib/c32width.c: Likewise. * lib/errno.in.h: Likewise. * lib/euidaccess.c: Likewise. * lib/fbufmode.c: Likewise. * lib/fenv-except-state-get.c: Likewise. * lib/fenv-except-state-set.c: Likewise. * lib/fenv-except-tracking-clear.c: Likewise. * lib/fenv-except-tracking-set.c: Likewise. * lib/fenv-except-tracking-test.c: Likewise. * lib/fenv-except-trapping.c: Likewise. * lib/fenv-round.c: Likewise. * lib/fflush.c: Likewise. * lib/fileblocks.c: Likewise. * lib/forkpty.c: Likewise. * lib/fpending.c: Likewise. * lib/fpurge.c: Likewise. * lib/freadable.c: Likewise. * lib/freadahead.c: Likewise. * lib/freading.c: Likewise. * lib/freadptr.c: Likewise. * lib/freadseek.c: Likewise. * lib/fseeko.c: Likewise. * lib/fseterr.c: Likewise. * lib/fsusage.c: Likewise. * lib/fwritable.c: Likewise. * lib/fwriting.c: Likewise. * lib/getdomainname.c: Likewise. * lib/idpriv-drop.c: Likewise. * lib/idpriv-droptemp.c: Likewise. * lib/limits.in.h: Likewise. * lib/mbrtoc16.c: Likewise. * lib/mbrtoc32.c: Likewise. * lib/mbsrtoc32s-state.c: Likewise. * lib/mbsrtowcs-state.c: Likewise. * lib/mbtowc-lock.h: Likewise. * lib/minmax.h: Likewise. * lib/netdb.in.h: Likewise. * lib/pipe-filter-ii.c: Likewise. * lib/posix_openpt.c: Likewise. * lib/ptsname_r.c: Likewise. * lib/readutmp.c: Likewise. * lib/readutmp.h: Likewise. * lib/resource-ext.h: Likewise. * lib/safe-read.h: Likewise. * lib/safe-write.h: Likewise. * lib/save-cwd.c: Likewise. * lib/stdbool.in.h: Likewise. * lib/striconv.c: Likewise. * lib/striconveh.c: Likewise. * lib/termcap.h: Likewise. * lib/terminfo.h: Likewise. * lib/unistd.in.h: Likewise. * lib/vasnprintf.c: Likewise. * lib/wcrtomb.c: Likewise. * lib/wcsrtombs-state.c: Likewise. * m4/fenv-environment.m4: Likewise. * m4/fenv-exceptions-state.m4: Likewise. * m4/fenv-exceptions-tracking.m4: Likewise. * m4/fenv-rounding.m4: Likewise. * m4/fmod.m4: Likewise. * m4/getdomainname.m4: Likewise. * m4/getloadavg.m4: Likewise. * m4/getopt.m4: Likewise. * m4/hypot.m4: Likewise. * m4/hypotf.m4: Likewise. * m4/hypotl.m4: Likewise. * m4/iconv.m4: Likewise. * m4/intl-thread-locale.m4: Likewise. * m4/largefile.m4: Likewise. * m4/libdl.m4: Likewise. * m4/locale-ja.m4: Likewise. * m4/locale_h.m4: Likewise. * m4/log.m4: Likewise. * m4/log10.m4: Likewise. * m4/log10f.m4: Likewise. * m4/logf.m4: Likewise. * m4/modf.m4: Likewise. * m4/modff.m4: Likewise. * m4/modfl.m4: Likewise. * m4/pthread-rwlock.m4: Likewise. * m4/semaphore.m4: Likewise. * m4/socklen.m4: Likewise. * m4/stdint.m4: Likewise. * m4/strtod.m4: Likewise. * m4/strtof.m4: Likewise. * m4/strtold.m4: Likewise. * modules/sigsegv: Likewise. * posix-modules: Likewise. * pygnulib/GLImport.py: Likewise. * tests/init.sh: Likewise. * tests/test-echo.sh: Likewise. * tests/test-isatty.c: Likewise. * tests/test-math-h.c: Likewise. * tests/test-nonblocking-pipe.h: Likewise. * tests/test-nonblocking-socket.h: Likewise. * tests/test-strtod.h: Likewise. * tests/test-strtof.h: Likewise. * tests/test-strtold.h: Likewise. * tests/test-vasnprintf.c: Likewise. * tests/test-vasnwprintf.c: Likewise.
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/* Functions for controlling the floating-point rounding direction.
Copyright (C) 1997-2025 Free Software Foundation, Inc.
This file 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.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* Based on glibc/sysdeps/<cpu>/{fegetround.c,fesetround.c}
together with glibc/sysdeps/<cpu>/{fpu_control.h,fenv_private.h,fenv_libc.h}. */
#include <config.h>
/* Specification. */
#include <fenv.h>
#include "fenv-private.h"
#if defined __GNUC__ || defined __clang__ || defined _MSC_VER
# if (defined __x86_64__ || defined _M_X64) || (defined __i386 || defined _M_IX86)
int
fegetround (void)
{
# ifdef _MSC_VER
/* Use the rounding direction from the SSE unit. */
unsigned int mxcsr;
_FPU_GETSSECW (mxcsr);
unsigned int fctrl = (mxcsr >> 3) & 0x0C00;
# else
/* Use the rounding direction from the control word of the 387 unit, the
so-called fctrl register.
The rounding direction of the SSE unit, in the mxcsr register, is expected
to be in sync with that. */
unsigned short fctrl;
_FPU_GETCW (fctrl);
# endif
# if defined _MSC_VER || (defined __MINGW32__ && FE_INVALID != 0x01)
/* The MSVC header files have different values for the rounding directions
than all the other platforms, and they even changed between MSVC 14 and
MSVC 14.30 (!). Map
0x0000 -> FE_TONEAREST = 0
0x0400 -> FE_DOWNWARD
0x0800 -> FE_UPWARD
0x0C00 -> FE_TOWARDZERO = FE_DOWNWARD | FE_UPWARD */
return (fctrl & 0x0800 ? FE_UPWARD : 0) | (fctrl & 0x0400 ? FE_DOWNWARD : 0);
# else
return fctrl & 0x0C00;
# endif
}
int
fesetround (int rounding_direction)
{
# if defined _MSC_VER || (defined __MINGW32__ && FE_INVALID != 0x01)
/* The MSVC header files have different values for the rounding directions
than all the other platforms. */
if ((rounding_direction & ~0x0300) != 0)
return -1;
/* The MSVC header files have different values for the rounding directions
than all the other platforms, and they even changed between MSVC 14 and
MSVC 14.30 (!). Map
FE_TONEAREST = 0 -> 0x0000
FE_DOWNWARD -> 0x0400
FE_UPWARD -> 0x0800
FE_TOWARDZERO = FE_DOWNWARD | FE_UPWARD -> 0x0C00 */
rounding_direction =
(rounding_direction & FE_UPWARD ? 0x0800 : 0)
| (rounding_direction & FE_DOWNWARD ? 0x0400 : 0);
# else
if ((rounding_direction & ~0x0C00) != 0)
return -1;
# endif
# ifdef _MSC_VER
/* Set it in the SSE unit. */
unsigned int mxcsr, orig_mxcsr;
_FPU_GETSSECW (orig_mxcsr);
mxcsr = (orig_mxcsr & ~(0x0C00 << 3)) | (rounding_direction << 3);
if (mxcsr != orig_mxcsr)
_FPU_SETSSECW (mxcsr);
# else
/* Set it in the 387 unit. */
unsigned short fctrl, orig_fctrl;
_FPU_GETCW (orig_fctrl);
fctrl = (orig_fctrl & ~0x0C00) | rounding_direction;
if (fctrl != orig_fctrl)
_FPU_SETCW (fctrl);
if (CPU_HAS_SSE ())
{
/* Set it in the SSE unit as well. */
unsigned int mxcsr, orig_mxcsr;
_FPU_GETSSECW (orig_mxcsr);
mxcsr = (orig_mxcsr & ~(0x0C00 << 3)) | (rounding_direction << 3);
if (mxcsr != orig_mxcsr)
_FPU_SETSSECW (mxcsr);
}
# endif
return 0;
}
# elif defined __aarch64__ /* arm64 */
int
fegetround (void)
{
unsigned long fpcr;
_FPU_GETCW (fpcr);
return (fpcr & 0x00C00000UL)
# if FE_TOWARDZERO == 3 /* FreeBSD compatible FE_* values */
>> 22
# endif
;
}
int
fesetround (int rounding_direction)
{
# if FE_TOWARDZERO == 3 /* FreeBSD compatible FE_* values */
if ((rounding_direction & ~3) != 0)
return -1;
rounding_direction = rounding_direction << 22;
# else /* glibc compatible FE_* values */
if ((rounding_direction & ~0x00C00000UL) != 0)
return -1;
# endif
unsigned long fpcr, orig_fpcr;
_FPU_GETCW (orig_fpcr);
fpcr = (orig_fpcr & ~0x00C00000UL) | rounding_direction;
if (fpcr != orig_fpcr)
_FPU_SETCW (fpcr);
return 0;
}
# elif defined __arm__
int
fegetround (void)
{
# ifdef __SOFTFP__
return FE_TONEAREST;
# else
unsigned int fpscr;
_FPU_GETCW (fpscr);
return fpscr & 0x00C00000U;
# endif
}
int
fesetround (int rounding_direction)
{
# ifdef __SOFTFP__
if (rounding_direction != FE_TONEAREST)
return -1;
# else
if ((rounding_direction & ~0x00C00000U) != 0)
return -1;
unsigned int fpscr, orig_fpscr;
_FPU_GETCW (orig_fpscr);
fpscr = (orig_fpscr & ~0x00C00000U) | rounding_direction;
if (fpscr != orig_fpscr)
_FPU_SETCW (fpscr);
# endif
return 0;
}
# elif defined __alpha
int
fegetround (void)
{
unsigned long fpcr;
_FPU_GETCW (fpcr);
return (fpcr >> 58) & 0x3UL;
}
int
fesetround (int rounding_direction)
{
if ((rounding_direction & ~0x3UL) != 0)
return -1;
unsigned long fpcr, orig_fpcr;
_FPU_GETCW (orig_fpcr);
fpcr = (orig_fpcr & ~(0x3UL << 58))
| ((unsigned long) rounding_direction << 58);
if (fpcr != orig_fpcr)
_FPU_SETCW (fpcr);
return 0;
}
# elif defined __hppa
int
fegetround (void)
{
unsigned int fpstatus;
_FPU_GETCW (fpstatus);
return fpstatus & 0x00000600U;
}
int
fesetround (int rounding_direction)
{
if ((rounding_direction & ~0x00000600U) != 0)
return -1;
unsigned int fpstatus, orig_fpstatus;
_FPU_GETCW (orig_fpstatus);
fpstatus = (orig_fpstatus & ~0x00000600U) | rounding_direction;
if (fpstatus != orig_fpstatus)
_FPU_SETCW (fpstatus);
return 0;
}
# elif defined __ia64__
int
fegetround (void)
{
unsigned long fpsr;
_FPU_GETCW (fpsr);
return (fpsr >> 10) & 0x3UL;
}
int
fesetround (int rounding_direction)
{
if ((rounding_direction & ~0x3UL) != 0)
return -1;
unsigned long fpsr, orig_fpsr;
_FPU_GETCW (orig_fpsr);
fpsr = (orig_fpsr & ~(0x3UL << 10))
| ((unsigned long) rounding_direction << 10);
if (fpsr != orig_fpsr)
_FPU_SETCW (fpsr);
return 0;
}
# elif defined __m68k__
int
fegetround (void)
{
unsigned int fpcr;
_FPU_GETCW (fpcr);
return fpcr & 0x30U;
}
int
fesetround (int rounding_direction)
{
if ((rounding_direction & ~0x30U) != 0)
return -1;
unsigned int fpcr, orig_fpcr;
_FPU_GETCW (orig_fpcr);
fpcr = (orig_fpcr & ~0x30U) | rounding_direction;
if (fpcr != orig_fpcr)
_FPU_SETCW (fpcr);
return 0;
}
# elif defined __mips__
int
fegetround (void)
{
unsigned int fcsr;
_FPU_GETCW (fcsr);
return fcsr & 0x3U;
}
int
fesetround (int rounding_direction)
{
if ((rounding_direction & ~0x3U) != 0)
return -1;
unsigned int fcsr, orig_fcsr;
_FPU_GETCW (orig_fcsr);
fcsr = (orig_fcsr & ~0x3U) | rounding_direction;
if (fcsr != orig_fcsr)
_FPU_SETCW (fcsr);
return 0;
}
# elif defined __loongarch__
int
fegetround (void)
{
unsigned int fcsr;
_FPU_GETCW (fcsr);
return fcsr & 0x300U;
}
int
fesetround (int rounding_direction)
{
if ((rounding_direction & ~0x300U) != 0)
return -1;
unsigned int fcsr, orig_fcsr;
_FPU_GETCW (orig_fcsr);
fcsr = (orig_fcsr & ~0x300U) | rounding_direction;
if (fcsr != orig_fcsr)
_FPU_SETCW (fcsr);
return 0;
}
# elif defined __powerpc__
/* The AIX header files have different values for the rounding directions
than all the other platforms: The values 0 and 1 are swapped.
(They probably did this in order to have a trivial FLT_ROUNDS macro, cf.
<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/float.h.html>.)
Define some handy macros for conversion. */
# ifdef _AIX
# define fe_to_hardware(x) ((x) ^ ((x) < 2))
# define hardware_to_fe(x) ((x) ^ ((x) < 2))
# else
# define fe_to_hardware(x) (x)
# define hardware_to_fe(x) (x)
# endif
int
fegetround (void)
{
# if 1
unsigned int result;
__asm__ __volatile__ ("mcrfs 7,7 ; mfcr %0" : "=r" (result) : : "cr7");
return hardware_to_fe (result & 3);
# else
union { unsigned long long u; double f; } memenv;
_FPU_GETCW_AS_DOUBLE (memenv.f);
return hardware_to_fe (memenv.u & 3);
# endif
}
int
fesetround (int rounding_direction)
{
if ((rounding_direction & ~0x3U) != 0)
return -1;
# ifdef _AIX
rounding_direction = fe_to_hardware (rounding_direction);
# endif
if (rounding_direction & 2)
__asm__ __volatile__ ("mtfsb1 30");
else
__asm__ __volatile__ ("mtfsb0 30");
if (rounding_direction & 1)
__asm__ __volatile__ ("mtfsb1 31");
else
__asm__ __volatile__ ("mtfsb0 31");
return 0;
}
# elif defined __riscv
int
fegetround (void)
{
int rounding_direction;
__asm__ __volatile__ ("frrm %0" : "=r" (rounding_direction));
# if FE_UPWARD == 0x60 /* FreeBSD compatible FE_* values */
return rounding_direction << 5;
# else
return rounding_direction;
# endif
}
int
fesetround (int rounding_direction)
{
# if FE_UPWARD == 0x60 /* FreeBSD compatible FE_* values */
if ((rounding_direction & ~0x60) != 0)
return -1;
rounding_direction = rounding_direction >> 5;
# else
if ((rounding_direction & ~3) != 0)
return -1;
# endif
__asm__ __volatile__ ("fsrm %z0" : : "rJ" (rounding_direction));
return 0;
}
# elif defined __s390__ || defined __s390x__
int
fegetround (void)
{
unsigned int fpc;
_FPU_GETCW (fpc);
return fpc & 0x3U;
}
int
fesetround (int rounding_direction)
{
if ((rounding_direction & ~0x3U) != 0)
return -1;
# if 1
__asm__ __volatile__ ("srnm 0(%0)" : : "a" (rounding_direction));
# else
unsigned int fpc, orig_fpc;
_FPU_GETCW (orig_fpc);
fpc = (orig_fpc & ~0x3U) | rounding_direction;
if (fpc != orig_fpc)
_FPU_SETCW (fpc);
# endif
return 0;
}
# elif defined __sh__
int
fegetround (void)
{
unsigned int fpscr;
_FPU_GETCW (fpscr);
return fpscr & 0x1U;
}
int
fesetround (int rounding_direction)
{
if ((rounding_direction & ~0x1U) != 0)
return -1;
unsigned int fpscr, orig_fpscr;
_FPU_GETCW (orig_fpscr);
fpscr = (orig_fpscr & ~0x1U) | rounding_direction;
if (fpscr != orig_fpscr)
_FPU_SETCW (fpscr);
return 0;
}
# elif defined __sparc
int
fegetround (void)
{
unsigned long fsr;
_FPU_GETCW (fsr);
return (fsr & 0xC0000000UL)
# if FE_DOWNWARD == 3 /* FreeBSD compatible FE_* values */
>> 30
# endif
;
}
int
fesetround (int rounding_direction)
{
# if FE_DOWNWARD == 3 /* FreeBSD compatible FE_* values */
if ((rounding_direction & ~3) != 0)
return -1;
rounding_direction = (unsigned int) rounding_direction << 30;
# else /* glibc compatible FE_* values */
if (((unsigned int) rounding_direction & ~0xC0000000UL) != 0)
return -1;
# endif
unsigned long fsr, orig_fsr;
_FPU_GETCW (orig_fsr);
fsr = (orig_fsr & ~0xC0000000UL) | (unsigned int) rounding_direction;
if (fsr != orig_fsr)
_FPU_SETCW (fsr);
return 0;
}
# else
# if defined __GNUC__ || defined __clang__
# warning "Unknown CPU / architecture. Please report your platform and compiler to <bug-gnulib@gnu.org>."
# endif
# define NEED_FALLBACK 1
# endif
#else
/* The compiler does not support __asm__ statements or equivalent
intrinsics. */
# if HAVE_FPSETROUND
/* FreeBSD ≥ 3.1, NetBSD ≥ 1.1, OpenBSD, Solaris, Minix ≥ 3.2. */
/* Get fpgetround, fpsetround. */
# include <ieeefp.h>
int
fegetround (void)
{
return fpgetround ();
}
int
fesetround (int rounding_direction)
{
fpsetround (rounding_direction);
return 0;
}
# elif defined _AIX /* AIX */
/* Get fp_read_rnd, fp_swap_rnd. */
# include <float.h>
/* Documentation:
<https://www.ibm.com/docs/en/aix/7.3?topic=f-fp-read-rnd-fp-swap-rnd-subroutine> */
int
fegetround (void)
{
return fp_read_rnd ();
}
int
fesetround (int rounding_direction)
{
fp_swap_rnd (rounding_direction);
return 0;
}
# else
# define NEED_FALLBACK 1
# endif
#endif
#if NEED_FALLBACK
/* A dummy fallback. */
# include <float.h>
# include <stdlib.h>
int
fegetround (void)
{
/* Cf. <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/float.h.html> */
switch (FLT_ROUNDS)
{
case 0: return FE_TOWARDZERO;
case 1: return FE_TONEAREST;
case 2: return FE_UPWARD;
case 3: return FE_DOWNWARD;
default: abort ();
}
}
int
fesetround (int rounding_direction)
{
if (rounding_direction != fegetround ())
return -1;
return 0;
}
#endif