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[Qemu-devel] [PATCH v5 05/28] fpu/softfloat: Canonicalize NaN fraction
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH v5 05/28] fpu/softfloat: Canonicalize NaN fraction |
Date: |
Mon, 14 May 2018 15:11:56 -0700 |
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.
Signed-off-by: Richard Henderson <address@hidden>
---
fpu/softfloat.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
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);
--
2.17.0
- [Qemu-devel] [PATCH v5 00/28] softfloat patch roundup, Richard Henderson, 2018/05/14
- [Qemu-devel] [PATCH v5 01/28] fpu/softfloat: Fix conversion from uint64 to float128, Richard Henderson, 2018/05/14
- [Qemu-devel] [PATCH v5 02/28] fpu/softfloat: Merge NO_SIGNALING_NANS definitions, Richard Henderson, 2018/05/14
- [Qemu-devel] [PATCH v5 04/28] fpu/softfloat: Move softfloat-specialize.h below FloatParts definition, Richard Henderson, 2018/05/14
- [Qemu-devel] [PATCH v5 03/28] fpu/softfloat: Split floatXX_silence_nan from floatXX_maybe_silence_nan, Richard Henderson, 2018/05/14
- [Qemu-devel] [PATCH v5 05/28] fpu/softfloat: Canonicalize NaN fraction,
Richard Henderson <=
- [Qemu-devel] [PATCH v5 06/28] fpu/softfloat: Introduce parts_is_snan_frac, Richard Henderson, 2018/05/14
- [Qemu-devel] [PATCH v5 09/28] target/arm: Use floatX_silence_nan when we have already checked for SNaN, Richard Henderson, 2018/05/14
- [Qemu-devel] [PATCH v5 08/28] fpu/softfloat: Replace float_class_msnan with parts_silence_nan, Richard Henderson, 2018/05/14
- [Qemu-devel] [PATCH v5 07/28] fpu/softfloat: Replace float_class_dnan with parts_default_nan, Richard Henderson, 2018/05/14