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| author | Richard Henderson | 2018-05-10 21:14:21 +0200 |
|---|---|---|
| committer | Richard Henderson | 2018-05-18 00:24:19 +0200 |
| commit | 94933df0e5c34d1a50fc950553f9c9649cae5320 (patch) | |
| tree | f0a4621841e810d1922d1b2dc2379f43102f7730 /fpu | |
| parent | fpu/softfloat: Move softfloat-specialize.h below FloatParts definition (diff) | |
| download | qemu-94933df0e5c34d1a50fc950553f9c9649cae5320.tar.gz qemu-94933df0e5c34d1a50fc950553f9c9649cae5320.tar.xz qemu-94933df0e5c34d1a50fc950553f9c9649cae5320.zip | |
fpu/softfloat: Canonicalize NaN fraction
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.
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'fpu')
| -rw-r--r-- | fpu/softfloat.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 0d17027379..607c4a78d5 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -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); |