2000-10-15 03:34:57 +00:00
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/* Install given floating-point environment.
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2021-01-02 19:32:25 +00:00
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Copyright (C) 1997-2021 Free Software Foundation, Inc.
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2000-10-15 03:34:57 +00:00
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This file is part of the GNU C Library.
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Contributed by David Huggins-Daines <dhd@debian.org>, 2000
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Based on the m68k version by
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Andreas Schwab <schwab@suse.de>
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 04:56:23 +00:00
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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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2000-10-15 03:34:57 +00:00
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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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2001-07-06 04:56:23 +00:00
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Lesser General Public License for more details.
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2000-10-15 03:34:57 +00:00
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2001-07-06 04:56:23 +00:00
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You should have received a copy of the GNU Lesser General Public
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2012-03-09 23:56:38 +00:00
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License along with the GNU C Library. If not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2000-10-15 03:34:57 +00:00
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#include <fenv.h>
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int
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2015-01-06 23:36:20 +00:00
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__fesetenv (const fenv_t *envp)
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2000-10-15 03:34:57 +00:00
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{
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2006-04-21 00:27:20 +00:00
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union { unsigned long long buf[4]; fenv_t env; } temp;
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unsigned long long *bufptr;
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2000-10-15 03:34:57 +00:00
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/* Install the environment specified by ENVP. But there are a few
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values which we do not want to come from the saved environment.
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Therefore, we get the current environment and replace the values
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we want to use from the environment specified by the parameter. */
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2006-04-21 00:27:20 +00:00
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bufptr = temp.buf;
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2003-12-18 03:57:31 +00:00
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__asm__ (
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2015-03-11 03:43:50 +00:00
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"fstd %%fr0,0(%1)\n"
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2008-05-12 12:09:21 +00:00
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: "=m" (temp) : "r" (bufptr) : "%r0");
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2000-10-15 03:34:57 +00:00
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2006-04-21 00:27:20 +00:00
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temp.env.__status_word &= ~(FE_ALL_EXCEPT
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| (FE_ALL_EXCEPT << 27)
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| FE_DOWNWARD);
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2000-10-15 03:34:57 +00:00
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if (envp == FE_DFL_ENV)
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2012-11-19 05:40:05 +00:00
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temp.env.__status_word = 0;
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2000-10-15 03:34:57 +00:00
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else if (envp == FE_NOMASK_ENV)
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2006-04-21 00:27:20 +00:00
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temp.env.__status_word |= FE_ALL_EXCEPT;
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2000-10-15 03:34:57 +00:00
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else
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2006-04-21 00:27:20 +00:00
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temp.env.__status_word |= (envp->__status_word
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& (FE_ALL_EXCEPT
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| FE_DOWNWARD
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| (FE_ALL_EXCEPT << 27)));
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2000-10-15 03:34:57 +00:00
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2013-06-05 20:26:40 +00:00
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/* Load the new environment. We use bufptr again since the
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2006-04-21 00:27:20 +00:00
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initial asm has modified the value of the register and here
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we take advantage of that to load in reverse order so fr0
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is loaded last and T-Bit is enabled. */
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2003-12-18 03:57:31 +00:00
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__asm__ (
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2015-03-11 03:43:50 +00:00
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"fldd 0(%1),%%fr0\n"
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2008-05-12 12:09:21 +00:00
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: : "m" (temp), "r" (bufptr) : "%r0" );
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2000-10-15 03:34:57 +00:00
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/* Success. */
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return 0;
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}
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2015-01-06 23:36:20 +00:00
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libm_hidden_def (__fesetenv)
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weak_alias (__fesetenv, fesetenv)
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libm_hidden_weak (fesetenv)
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