2019-03-18 11:28:13 +00:00
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/* Round to nearest integer. PowerPC64 version.
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2021-01-02 19:32:25 +00:00
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Copyright (C) 2019-2021 Free Software Foundation, Inc.
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2019-03-18 11:28:13 +00:00
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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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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not, see <https://www.gnu.org/licenses/>. */
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2019-03-18 11:28:13 +00:00
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#define NO_MATH_REDIRECT
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#define lround __redirect_lround
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#define __lround __redirect___lround
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#include <math.h>
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#undef lround
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#undef __lround
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#include <libm-alias-double.h>
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#include <math-barriers.h>
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long long int
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__llround (double x)
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{
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#ifdef _ARCH_PWR5X
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double r = __builtin_round (x);
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/* Prevent gcc from calling llround directly when compiled with
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-fno-math-errno by inserting a barrier. */
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math_opt_barrier (r);
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return r;
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#else
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/* IEEE 1003.1 llround function. IEEE specifies "round to the nearest
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integer value, rounding halfway cases away from zero, regardless of
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the current rounding mode." However PowerPC Architecture defines
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"round to Nearest" as "Choose the best approximation. In case of a
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tie, choose the one that is even (least significant bit o).".
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So we can't use the PowerPC "round to Nearest" mode. Instead we set
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"round toward Zero" mode and round by adding +-0.5 before rounding
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to the integer value.
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It is necessary to detect when x is (+-)0x1.fffffffffffffp-2
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because adding +-0.5 in this case will cause an erroneous shift,
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carry and round. We simply return 0 if 0.5 > x > -0.5. Likewise
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if x is and odd number between +-(2^52 and 2^53-1) a shift and
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carry will erroneously round if biased with +-0.5. Therefore if x
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is greater/less than +-2^52 we don't need to bias the number with
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+-0.5. */
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double ax = fabs (x);
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if (ax < 0.5)
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return 0;
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if (ax < 0x1p+52)
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{
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/* Test whether an integer to avoid spurious "inexact". */
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double t = ax + 0x1p+52;
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t = t - 0x1p+52;
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if (ax != t)
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{
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ax = ax + 0.5;
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if (x < 0.0)
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ax = -fabs (ax);
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x = ax;
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}
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}
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long int ret;
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__asm__ ("fctidz %0, %1" : "=d" (ret) : "d" (x));
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return ret;
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#endif
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}
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#ifndef __llround
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strong_alias (__llround, __lround)
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libm_alias_double (__llround, llround)
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libm_alias_double (__lround, lround)
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#endif
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