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From: David Hildenbrand <david@redhat.com>
To: Richard Henderson <richard.henderson@linaro.org>, qemu-devel@nongnu.org
Cc: alex.bennee@linaro.org
Subject: Re: [PATCH v2 03/28] softfloat: Move uint_to_float to softfloat-parts.c.inc
Date: Wed, 26 May 2021 15:36:28 +0200	[thread overview]
Message-ID: <0e64bd09-0662-38a9-d29a-67db76afdc99@redhat.com> (raw)
In-Reply-To: <20210525150706.294968-4-richard.henderson@linaro.org>

On 25.05.21 17:06, Richard Henderson wrote:
> Rename to parts$N_uint_to_float.
> Reimplement uint64_to_float128 with FloatParts128.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   fpu/softfloat.c           | 83 ++++++++++++++++-----------------------
>   fpu/softfloat-parts.c.inc | 23 +++++++++++
>   2 files changed, 56 insertions(+), 50 deletions(-)
> 
> diff --git a/fpu/softfloat.c b/fpu/softfloat.c
> index 6404a2997f..db14bd09aa 100644
> --- a/fpu/softfloat.c
> +++ b/fpu/softfloat.c
> @@ -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
> diff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc
> index 8102de1307..f3c4f8c8d2 100644
> --- a/fpu/softfloat-parts.c.inc
> +++ b/fpu/softfloat-parts.c.inc
> @@ -913,3 +913,26 @@ 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;
> +    }
> +}
> 

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Thanks,

David / dhildenb



  reply	other threads:[~2021-05-26 13:37 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-25 15:06 [PATCH v2 00/28] Convert floatx80 and float128 to FloatParts Richard Henderson
2021-05-25 15:06 ` [PATCH v2 01/28] softfloat: Move round_to_uint_and_pack to softfloat-parts.c.inc Richard Henderson
2021-06-02 11:12   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 02/28] softfloat: Move int_to_float " Richard Henderson
2021-05-26 13:34   ` David Hildenbrand
2021-06-02 11:14   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 03/28] softfloat: Move uint_to_float " Richard Henderson
2021-05-26 13:36   ` David Hildenbrand [this message]
2021-06-02 11:31   ` Alex Bennée
2021-06-02 16:28     ` Richard Henderson
2021-05-25 15:06 ` [PATCH v2 04/28] softfloat: Move minmax_flags " Richard Henderson
2021-05-26 13:45   ` David Hildenbrand
2021-06-02 20:36   ` Alex Bennée
2021-06-02 22:23     ` Richard Henderson
2021-06-02 22:29   ` Richard Henderson
2021-05-25 15:06 ` [PATCH v2 05/28] softfloat: Move compare_floats " Richard Henderson
2021-06-03  9:00   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 06/28] softfloat: Move scalbn_decomposed " Richard Henderson
2021-06-03  9:01   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 07/28] softfloat: Move sqrt_float " Richard Henderson
2021-06-03  9:17   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 08/28] softfloat: Split out parts_uncanon_normal Richard Henderson
2021-06-03  9:22   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 09/28] softfloat: Reduce FloatFmt Richard Henderson
2021-06-03  9:23   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 10/28] softfloat: Introduce Floatx80RoundPrec Richard Henderson
2021-06-03  9:26   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 11/28] softfloat: Adjust parts_uncanon_normal for floatx80 Richard Henderson
2021-06-03 11:58   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 12/28] tests/fp/fp-test: Reverse order of floatx80 precision tests Richard Henderson
2021-05-25 15:06 ` [PATCH v2 13/28] softfloat: Convert floatx80_add/sub to FloatParts Richard Henderson
2021-06-03 14:23   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 14/28] softfloat: Convert floatx80_mul " Richard Henderson
2021-06-03 14:23   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 15/28] softfloat: Convert floatx80_div " Richard Henderson
2021-06-03 14:23   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 16/28] softfloat: Convert floatx80_sqrt " Richard Henderson
2021-06-03 14:24   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 17/28] softfloat: Convert floatx80_round " Richard Henderson
2021-06-03 14:25   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 18/28] softfloat: Convert floatx80_round_to_int " Richard Henderson
2021-06-03 14:26   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 19/28] softfloat: Convert integer to floatx80 " Richard Henderson
2021-06-03 14:26   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 20/28] softfloat: Convert floatx80 float conversions " Richard Henderson
2021-06-03 14:26   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 21/28] softfloat: Convert floatx80 to integer " Richard Henderson
2021-06-03 14:27   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 22/28] softfloat: Convert floatx80_scalbn " Richard Henderson
2021-06-03 14:34   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 23/28] softfloat: Convert floatx80 compare " Richard Henderson
2021-06-03 14:34   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 24/28] softfloat: Convert float32_exp2 " Richard Henderson
2021-06-03 14:44   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 25/28] softfloat: Move floatN_log2 to softfloat-parts.c.inc Richard Henderson
2021-06-02 15:28   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 26/28] softfloat: Convert modrem operations to FloatParts Richard Henderson
2021-06-03 14:48   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 27/28] tests/fp: Enable more tests Richard Henderson
2021-05-25 15:07 ` [PATCH v2 28/28] softfloat: Use hard-float for {u}int64_to_float{32, 64} Richard Henderson
2021-06-03 14:57   ` [PATCH v2 28/28] softfloat: Use hard-float for {u}int64_to_float{32,64} Alex Bennée
2021-05-25 16:51 ` [PATCH v2 00/28] Convert floatx80 and float128 to FloatParts no-reply

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