softfloat: Use correct type in float64_to_uint64_round_to_zero()

In float64_to_uint64_round_to_zero() a typo meant that we were
taking the uint64_t return value from float64_to_uint64() and
putting it into an int64_t variable before returning it as
uint64_t again. Use uint64_t instead of pointlessly casting it
back and forth to int64_t.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
Spotted while reading the code...

 fpu/softfloat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Le 03/02/2017 à 19:59, Peter Maydell a écrit :
> In float64_to_uint64_round_to_zero() a typo meant that we were
> taking the uint64_t return value from float64_to_uint64() and
> putting it into an int64_t variable before returning it as
> uint64_t again. Use uint64_t instead of pointlessly casting it
> back and forth to int64_t.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Laurent Vivier <laurent@vivier.eu>

> ---
> Spotted while reading the code...
> 
>  fpu/softfloat.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fpu/softfloat.c b/fpu/softfloat.c
> index c295f31..218b375 100644
> --- a/fpu/softfloat.c
> +++ b/fpu/softfloat.c
> @@ -7386,7 +7386,7 @@ uint64_t float64_to_uint64_round_to_zero(float64 a, float_status *status)
>  {
>      signed char current_rounding_mode = status->float_rounding_mode;
>      set_float_rounding_mode(float_round_to_zero, status);
> -    int64_t v = float64_to_uint64(a, status);
> +    uint64_t v = float64_to_uint64(a, status);
>      set_float_rounding_mode(current_rounding_mode, status);
>      return v;
>  }
>

On 02/03/2017 03:59 PM, Peter Maydell wrote:
> In float64_to_uint64_round_to_zero() a typo meant that we were
> taking the uint64_t return value from float64_to_uint64() and
> putting it into an int64_t variable before returning it as
> uint64_t again. Use uint64_t instead of pointlessly casting it
> back and forth to int64_t.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

> ---
> Spotted while reading the code...
>
>  fpu/softfloat.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fpu/softfloat.c b/fpu/softfloat.c
> index c295f31..218b375 100644
> --- a/fpu/softfloat.c
> +++ b/fpu/softfloat.c
> @@ -7386,7 +7386,7 @@ uint64_t float64_to_uint64_round_to_zero(float64 a, float_status *status)
>  {
>      signed char current_rounding_mode = status->float_rounding_mode;
>      set_float_rounding_mode(float_round_to_zero, status);
> -    int64_t v = float64_to_uint64(a, status);
> +    uint64_t v = float64_to_uint64(a, status);
>      set_float_rounding_mode(current_rounding_mode, status);
>      return v;
>  }
>

03.02.2017 21:59, Peter Maydell wrote:
> In float64_to_uint64_round_to_zero() a typo meant that we were
> taking the uint64_t return value from float64_to_uint64() and
> putting it into an int64_t variable before returning it as
> uint64_t again. Use uint64_t instead of pointlessly casting it
> back and forth to int64_t.

Applied to -trivial, thanks!

/mjt