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fpu/softfloat: Canonicalize NaN fraction

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Shift the NaN fraction to a canonical position, much like we
do for the fraction of normal numbers. This will facilitate
manipulation of NaNs within the shared code paths.

Backports commit 94933df0e5c34d1a50fc950553f9c9649cae5320 from qemu
This commit is contained in:
Richard Henderson 2018-05-19 22:17:38 -04:00 committed by Lioncash
parent 3873bfe133
commit f89c1fc034
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 6 additions and 1 deletions
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7
qemu/fpu/softfloat.c
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@ -330,10 +330,11 @@ static FloatParts canonicalize(FloatParts part, const FloatFmt *parm,
if (part.frac == 0) {
part.cls = float_class_inf;
} else {
part.frac <<= parm->frac_shift;
#ifdef NO_SIGNALING_NANS
part.cls = float_class_qnan;
#else
int64_t msb = part.frac << (parm->frac_shift + 2);
int64_t msb = part.frac << 2;
if ((msb < 0) == status->snan_bit_is_one) {
part.cls = float_class_snan;
} else {
@ -480,6 +481,7 @@ static FloatParts round_canonical(FloatParts p, float_status *s,
case float_class_qnan:
case float_class_snan:
exp = exp_max;
frac >>= parm->frac_shift;
break;
default:
@ -503,6 +505,7 @@ static float16 float16_round_pack_canonical(FloatParts p, float_status *s)
case float_class_dnan:
return float16_default_nan(s);
case float_class_msnan:
p.frac >>= float16_params.frac_shift;
return float16_maybe_silence_nan(float16_pack_raw(p), s);
default:
p = round_canonical(p, s, &float16_params);
@ -521,6 +524,7 @@ static float32 float32_round_pack_canonical(FloatParts p, float_status *s)
case float_class_dnan:
return float32_default_nan(s);
case float_class_msnan:
p.frac >>= float32_params.frac_shift;
return float32_maybe_silence_nan(float32_pack_raw(p), s);
default:
p = round_canonical(p, s, &float32_params);
@ -539,6 +543,7 @@ static float64 float64_round_pack_canonical(FloatParts p, float_status *s)
case float_class_dnan:
return float64_default_nan(s);
case float_class_msnan:
p.frac >>= float64_params.frac_shift;
return float64_maybe_silence_nan(float64_pack_raw(p), s);
default:
p = round_canonical(p, s, &float64_params);