00d5215ece
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> |
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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.