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softfloat: Move uint_to_float to softfloat-parts.c.inc

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Rename to parts$N_uint_to_float.
Reimplement uint64_to_float128 with FloatParts128.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-11-14 14:48:31 -08:00
parent e368951998
commit 37c954a1b9
2 changed files with 56 additions and 50 deletions
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23
fpu/softfloat-parts.c.inc
View File

@ -915,3 +915,26 @@ static void partsN(sint_to_float)(FloatPartsN *p, int64_t a,
p->exp = DECOMPOSED_BINARY_POINT - shift + scale;
p->frac_hi = f << shift;
}
/*
* Unsigned Integer to float conversions
*
* Returns the result of converting the unsigned integer `a' to the
* floating-point format. The conversion is performed according to the
* IEC/IEEE Standard for Binary Floating-Point Arithmetic.
*/
static void partsN(uint_to_float)(FloatPartsN *p, uint64_t a,
int scale, float_status *status)
{
memset(p, 0, sizeof(*p));
if (a == 0) {
p->cls = float_class_zero;
} else {
int shift = clz64(a);
scale = MIN(MAX(scale, -0x10000), 0x10000);
p->cls = float_class_normal;
p->exp = DECOMPOSED_BINARY_POINT - shift + scale;
p->frac_hi = a << shift;
}
}

83
fpu/softfloat.c
View File

@ -857,6 +857,14 @@ static void parts128_sint_to_float(FloatParts128 *p, int64_t a,
#define parts_sint_to_float(P, I, Z, S) \
PARTS_GENERIC_64_128(sint_to_float, P)(P, I, Z, S)
static void parts64_uint_to_float(FloatParts64 *p, uint64_t a,
int scale, float_status *s);
static void parts128_uint_to_float(FloatParts128 *p, uint64_t a,
int scale, float_status *s);
#define parts_uint_to_float(P, I, Z, S) \
PARTS_GENERIC_64_128(uint_to_float, P)(P, I, Z, S)
/*
* Helper functions for softfloat-parts.c.inc, per-size operations.
*/
@ -3102,35 +3110,15 @@ float128 int32_to_float128(int32_t a, float_status *status)
}
/*
* Unsigned Integer to float conversions
*
* Returns the result of converting the unsigned integer `a' to the
* floating-point format. The conversion is performed according to the
* IEC/IEEE Standard for Binary Floating-Point Arithmetic.
* Unsigned Integer to floating-point conversions
*/
static FloatParts64 uint_to_float(uint64_t a, int scale, float_status *status)
{
FloatParts64 r = { .sign = false };
int shift;
if (a == 0) {
r.cls = float_class_zero;
} else {
scale = MIN(MAX(scale, -0x10000), 0x10000);
shift = clz64(a);
r.cls = float_class_normal;
r.exp = DECOMPOSED_BINARY_POINT - shift + scale;
r.frac = a << shift;
}
return r;
}
float16 uint64_to_float16_scalbn(uint64_t a, int scale, float_status *status)
{
FloatParts64 pa = uint_to_float(a, scale, status);
return float16_round_pack_canonical(&pa, status);
FloatParts64 p;
parts_uint_to_float(&p, a, scale, status);
return float16_round_pack_canonical(&p, status);
}
float16 uint32_to_float16_scalbn(uint32_t a, int scale, float_status *status)
@ -3165,8 +3153,10 @@ float16 uint8_to_float16(uint8_t a, float_status *status)
float32 uint64_to_float32_scalbn(uint64_t a, int scale, float_status *status)
{
FloatParts64 pa = uint_to_float(a, scale, status);
return float32_round_pack_canonical(&pa, status);
FloatParts64 p;
parts_uint_to_float(&p, a, scale, status);
return float32_round_pack_canonical(&p, status);
}
float32 uint32_to_float32_scalbn(uint32_t a, int scale, float_status *status)
@ -3196,8 +3186,10 @@ float32 uint16_to_float32(uint16_t a, float_status *status)
float64 uint64_to_float64_scalbn(uint64_t a, int scale, float_status *status)
{
FloatParts64 pa = uint_to_float(a, scale, status);
return float64_round_pack_canonical(&pa, status);
FloatParts64 p;
parts_uint_to_float(&p, a, scale, status);
return float64_round_pack_canonical(&p, status);
}
float64 uint32_to_float64_scalbn(uint32_t a, int scale, float_status *status)
@ -3225,15 +3217,12 @@ float64 uint16_to_float64(uint16_t a, float_status *status)
return uint64_to_float64_scalbn(a, 0, status);
}
/*
* Returns the result of converting the unsigned integer `a' to the
* bfloat16 format.
*/
bfloat16 uint64_to_bfloat16_scalbn(uint64_t a, int scale, float_status *status)
{
FloatParts64 pa = uint_to_float(a, scale, status);
return bfloat16_round_pack_canonical(&pa, status);
FloatParts64 p;
parts_uint_to_float(&p, a, scale, status);
return bfloat16_round_pack_canonical(&p, status);
}
bfloat16 uint32_to_bfloat16_scalbn(uint32_t a, int scale, float_status *status)
@ -3261,6 +3250,14 @@ bfloat16 uint16_to_bfloat16(uint16_t a, float_status *status)
return uint64_to_bfloat16_scalbn(a, 0, status);
}
float128 uint64_to_float128(uint64_t a, float_status *status)
{
FloatParts128 p;
parts_uint_to_float(&p, a, 0, status);
return float128_round_pack_canonical(&p, status);
}
/* Float Min/Max */
/* min() and max() functions. These can't be implemented as
* 'compare and pick one input' because that would mishandle
@ -4972,20 +4969,6 @@ floatx80 int64_to_floatx80(int64_t a, float_status *status)
}
/*----------------------------------------------------------------------------
| Returns the result of converting the 64-bit unsigned integer `a'
| to the quadruple-precision floating-point format. The conversion is performed
| according to the IEC/IEEE Standard for Binary Floating-Point Arithmetic.
*----------------------------------------------------------------------------*/
float128 uint64_to_float128(uint64_t a, float_status *status)
{
if (a == 0) {
return float128_zero;
}
return normalizeRoundAndPackFloat128(0, 0x406E, 0, a, status);
}
/*----------------------------------------------------------------------------
| Returns the result of converting the single-precision floating-point value
| `a' to the extended double-precision floating-point format. The conversion