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Ulrich Weigand 00d5215ece Support 128-bit IEEE floating-point types on Intel and Power
Now that all the prerequisites are in place, this commit finally adds support
for handling the __float128 type on Intel and Power, by providing appropriate
platform-specific versions of the floatformat_for_type callback.

Since at this point we do not yet have any indication in the debug info to
distinguish different floating-point formats of the same length, we simply
use the type name as hint.  Types named "__float128" get the IEEE format.
In addition to handling "__float128" itself, we also recognize "_Float128"
and (on Power) "_Float64x", as well as the complex versions of those.
(As pointed out by Joseph Myers, starting with GCC 7, __float128 is just
a typedef for _Float128 -- but it's good to handle this anyway.)

A new test case does some simple verification that the format is decoded
correctly, using both __float128 and "long double" to make sure using both
in the same file still works.  Another new test verifies handling of the
_FloatN and _FloatNx types supported by GCC 7, as well as the complex
versions of those types.

Note that this still only supports basic format decoding and encoding.
We do not yet support the GNU extension 'g' suffix for __float128 constants.
In addition, since all *arithmetic* on floating-point values is still
performed in native host "long double" arithmetic, if that format is not
able to encode all target __float128 values, we may get incorrect results.
(To fix this would require implementing fully synthetic target floating-
point arithmetic along the lines of GCC's real.c, presumably using MPFR.)

gdb/ChangeLog:

	* i386-tdep.c (i386_floatformat_for_type): New function.
	(i386_gdbarch_init): Install it.
	* ppc-linux-tdep.c (ppc_floatformat_for_type): New function.
	(ppc_linux_init_abi): Install it.

gdb/testsuite/ChangeLog:

	* gdb.base/float128.c: New file.
	* gdb.base/float128.exp: Likewise.
	* gdb.base/floatn.c: Likewise.
	* gdb.base/floatn.exp: Likewise.

Signed-off-by: Ulrich Weigand <ulrich.weigand@de.ibm.com>
2016-09-06 17:33:15 +02:00
bfd Fix PR ld/20545 - relaxation bugs in avr backend 2016-09-06 12:28:37 +05:30
binutils Fix a problem in readelf where memcpy could be called with a NULL second argument. 2016-09-06 15:42:12 +01:00
config
cpu
elfcpp
etc
gas PowerPC VLE sh_flags and p_flags 2016-08-31 13:18:34 +09:30
gdb Support 128-bit IEEE floating-point types on Intel and Power 2016-09-06 17:33:15 +02:00
gold Handle ARM-specific --target1-abs, --target1-rel and --target2 options 2016-09-02 15:51:59 -07:00
gprof Partially revert previous delta - move limit testing code to first scan over symbol file. 2016-08-30 13:51:43 +01:00
include Fixes to legacy ARC relocations. 2016-08-26 12:09:17 +02:00
intl
ld Fix PR ld/20545 - relaxation bugs in avr backend 2016-09-06 12:28:37 +05:30
libdecnumber
libiberty Synchronize libiberty sources with FSF GCC mainline version. 2016-08-02 13:26:28 +01:00
opcodes Fixed issue with NULL pointer access on header var. 2016-08-30 18:21:13 +02:00
readline
sim sim: m68hc11: use standard STATIC_INLINE helper 2016-08-16 06:12:39 -07:00
texinfo
zlib
.cvsignore
.gitattributes
.gitignore
COPYING
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
COPYING3
COPYING3.LIB
ChangeLog Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
MAINTAINERS
Makefile.def
Makefile.in
Makefile.tpl
README
README-maintainer-mode
compile
config-ml.in
config.guess
config.rpath
config.sub
configure Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
configure.ac Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
depcomp
djunpack.bat
install-sh
libtool.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
lt~obsolete.m4
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
setup.com
src-release.sh
symlink-tree
ylwrap

README

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.