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IEEE754-1985 specifies the top bit of the mantissa as an indicator of signalling vs. quiet NaN, but does not define the precise semantics. Most architectures treat this bit as indicating quiet NaN, but legacy (pre-R6) MIPS goes the other way and treats it as signalling NaN. This used to be controlled by a macro that was only defined for MIPS. This patch replaces the macro with a variable to track the current semantics of the NaN bit and allows differentiation between older (pre-R6) and and newer MIPS cores. 2022-02-01 Faraz Shahbazker <fshahbazker@wavecomp.com> sim/common/ChangeLog: * sim-fpu.c (_sim_fpu): New. (pack_fpu, unpack_fpu): Allow reversal of quiet NaN semantics. * sim-fpu.h (sim_fpu_state): New struct. (_sim_fpu): New extern. (sim_fpu_quiet_nan_inverted): New define. sim/mips/ChangeLog: * cp1.h (fcsr_NAN2008_mask, fcsr_NAN2008_shift): New. * mips.igen (check_fpu): Select default quiet NaN mode for legacy MIPS. * sim-main.h (SIM_QUIET_NAN_NEGATED): Remove.
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.