-/* Manipulating the FPU control word.
- Copyright (C) 2007-2010 Free Software Foundation, Inc.
+/* Manipulating the FPU control word. -*- coding: utf-8 -*-
+ Copyright (C) 2007-2018 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2007.
This program is free software: you can redistribute it and/or modify
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef _FPUCW_H
#define _FPUCW_H
On some platforms, such as NetBSD, the default precision is set to
"double precision". This means that 'long double' instructions will operate
- only as 'double', i.e. lead wrong results.
+ only as 'double', i.e. lead to wrong results. Similarly on FreeBSD 6.4, at
+ least for the division of 'long double' numbers.
The FPU control word is under control of the application, i.e. it is
not required to be set either way by the ABI. (In fact, the i386 ABI
- http://refspecs.freestandards.org/elf/abi386-4.pdf page 3-12 = page 38
+ https://www.linux-mips.org/pub/linux/mips/doc/ABI/abi386-4.pdf page 3-12 = page 38
is not clear about it. But in any case, gcc treats the control word
like a "preserved" register: it emits code that assumes that the control
word is preserved across calls, and it restores the control word at the
end of functions that modify it.)
- See Vincent Lefèvre's page http://www.vinc17.org/research/extended.en.html
+ See Vincent Lefèvre's page https://www.vinc17.net/research/extended.en.html
for a good explanation.
See http://www.uwsg.iu.edu/hypermail/linux/kernel/0103.0/0453.html for
some argumentation which setting should be the default. */
projects / debian / gzip / blobdiff