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softfloat: Use parts_pick_nan in propagateFloatx80NaN

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Unpacking and repacking the parts may be slightly more work
than we did before, but we get to reuse more code.  For a
code path handling exceptional values, this is an improvement.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241203203949.483774-8-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-11 15:31:08 +00:00 • committed by Peter Maydell
parent 313938c105
commit 1b34f934dd
1 changed files with 5 additions and 38 deletions
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43
fpu/softfloat.c
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@ -4928,48 +4928,15 @@ void normalizeFloatx80Subnormal(uint64_t aSig, int32_t *zExpPtr,
floatx80 propagateFloatx80NaN(floatx80 a, floatx80 b, float_status *status)
{
bool aIsLargerSignificand;
FloatClass a_cls, b_cls;
FloatParts128 pa, pb, *pr;
/* This is not complete, but is good enough for pickNaN. */
a_cls = (!floatx80_is_any_nan(a)
? float_class_normal
: floatx80_is_signaling_nan(a, status)
? float_class_snan
: float_class_qnan);
b_cls = (!floatx80_is_any_nan(b)
? float_class_normal
: floatx80_is_signaling_nan(b, status)
? float_class_snan
: float_class_qnan);
if (is_snan(a_cls) || is_snan(b_cls)) {
float_raise(float_flag_invalid, status);
}
if (status->default_nan_mode) {
if (!floatx80_unpack_canonical(&pa, a, status) ||
!floatx80_unpack_canonical(&pb, b, status)) {
return floatx80_default_nan(status);
}
if (a.low < b.low) {
aIsLargerSignificand = 0;
} else if (b.low < a.low) {
aIsLargerSignificand = 1;
} else {
aIsLargerSignificand = (a.high < b.high) ? 1 : 0;
}
if (pickNaN(a_cls, b_cls, aIsLargerSignificand, status)) {
if (is_snan(b_cls)) {
return floatx80_silence_nan(b, status);
}
return b;
} else {
if (is_snan(a_cls)) {
return floatx80_silence_nan(a, status);
}
return a;
}
pr = parts_pick_nan(&pa, &pb, status);
return floatx80_round_pack_canonical(pr, status);
}
/*----------------------------------------------------------------------------