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softfloat: Convert float128_default_nan to parts 

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-10-23 16:37:01 -07:00
parent 0018b1f41b
commit e9034ea87e
2 changed files with 23 additions and 13 deletions
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19
fpu/softfloat-specialize.c.inc
View File

@ -171,6 +171,25 @@ static void parts64_default_nan(FloatParts64 *p, float_status *status)
}; };
} }
static void parts128_default_nan(FloatParts128 *p, float_status *status)
{
/*
* Extrapolate from the choices made by parts64_default_nan to fill
* in the quad-floating format. If the low bit is set, assume we
* want to set all non-snan bits.
*/
FloatParts64 p64;
parts64_default_nan(&p64, status);
*p = (FloatParts128) {
.cls = float_class_qnan,
.sign = p64.sign,
.exp = INT_MAX,
.frac_hi = p64.frac,
.frac_lo = -(p64.frac & 1)
};
}
/*---------------------------------------------------------------------------- /*----------------------------------------------------------------------------
| Returns a quiet NaN from a signalling NaN for the deconstructed | Returns a quiet NaN from a signalling NaN for the deconstructed
| floating-point parts. | floating-point parts.

17
fpu/softfloat.c
View File

@ -706,7 +706,7 @@ static float128 float128_pack_raw(const FloatParts128 *p)
#define PARTS_GENERIC_64_128(NAME, P) \ #define PARTS_GENERIC_64_128(NAME, P) \
QEMU_GENERIC(P, (FloatParts128 *, parts128_##NAME), parts64_##NAME) QEMU_GENERIC(P, (FloatParts128 *, parts128_##NAME), parts64_##NAME)
#define parts_default_nan parts64_default_nan #define parts_default_nan(P, S) PARTS_GENERIC_64_128(default_nan, P)(P, S)
#define parts_silence_nan(P, S) PARTS_GENERIC_64_128(silence_nan, P)(P, S) #define parts_silence_nan(P, S) PARTS_GENERIC_64_128(silence_nan, P)(P, S)
@ -3837,20 +3837,11 @@ float64 float64_default_nan(float_status *status)
float128 float128_default_nan(float_status *status) float128 float128_default_nan(float_status *status)
{ {
FloatParts64 p; FloatParts128 p;
float128 r;
parts_default_nan(&p, status); parts_default_nan(&p, status);
/* Extrapolate from the choices made by parts_default_nan to fill frac_shr(&p, float128_params.frac_shift);
* in the quad-floating format. If the low bit is set, assume we return float128_pack_raw(&p);
* want to set all non-snan bits.
*/
r.low = -(p.frac & 1);
r.high = p.frac >> (DECOMPOSED_BINARY_POINT - 48);
r.high |= UINT64_C(0x7FFF000000000000);
r.high |= (uint64_t)p.sign << 63;
return r;
} }
bfloat16 bfloat16_default_nan(float_status *status) bfloat16 bfloat16_default_nan(float_status *status)