aboutsummaryrefslogtreecommitdiff
path: root/COPYING3
diff options
context:
space:
mode:
authorFaraz Shahbazker <fshahbazker@wavecomp.com>2022-02-02 11:17:22 +0100
committerMike Frysinger <vapier@gentoo.org>2022-02-04 19:37:25 -0500
commitbf484e93483776072291c5cad2e289567d74c818 (patch)
treec835425923f43be579228b97ca2b5b0688887e54 /COPYING3
parenteb06e60a982e3903161252edf8fb8ae0c018c467 (diff)
downloadfsf-binutils-gdb-bf484e93483776072291c5cad2e289567d74c818.zip
fsf-binutils-gdb-bf484e93483776072291c5cad2e289567d74c818.tar.gz
fsf-binutils-gdb-bf484e93483776072291c5cad2e289567d74c818.tar.bz2
sim: Allow toggling of quiet NaN-bit semantics
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.
Diffstat (limited to 'COPYING3')
0 files changed, 0 insertions, 0 deletions