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target-mips: Activate IEEE 754-2008 signaling NaN bit meaning for MSA

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Function msa_reset() is updated so that flag snan_bit_is_one is
properly set to 0.

By applying this patch, a number of incorrect MSA behaviors that
require IEEE 754-2008 compliance will be fixed. Those are behaviors
that (up to the moment of applying this patch) did not get the desired
functionality from SoftFloat library with respect to distinguishing
between quiet and signaling NaN, getting default NaN values (both
quiet and signaling), establishing if a floating point number is NaN
or not, etc.

Two examples:

* FMAX, FMIN will now correctly detect and propagate NaNs.
* FCLASS.D ans FCLASS.S will now correcty detect NaN flavors

Backports commit 40bd6dd456e61a36e454fb9dd2cc739b67c224cf from qemu
This commit is contained in:
Aleksandar Markovic 2018-02-24 20:41:44 -05:00 committed by Lioncash
parent 3e9325f1e9
commit ef9f33a345
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 1 deletions
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3
qemu/target-mips/translate_init.c
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@ -1143,5 +1143,6 @@ static void msa_reset(CPUMIPSState *env)
/* clear float_status nan mode */
set_default_nan_mode(0, &env->active_tc.msa_fp_status);
set_snan_bit_is_one(1, &env->active_tc.msa_fp_status);
/* set proper signanling bit meaning ("1" means "quiet") */
set_snan_bit_is_one(0, &env->active_tc.msa_fp_status);
}