Re: [Qemu-devel] [PATCH v5 2/9] softfloat: For Mips only, correct default NaN values

[Leon Alrae <leon.alrae@imgtec.com>]

On 18/04/16 17:03, Aleksandar Markovic wrote:
> From: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
> 
> Only for Mips platform, and only for cases when snan_bit_is_one is 0,
> correct default NaN values (in their 16-, 32-, and 64-bit flavors).
> 
> For more info, see [1], page 84, Table 6.3 "Value Supplied When a New
> Quiet NaN Is Created", and [2], page 52, Table 3.7 "Default NaN
> Encodings".
> 
> [1] "MIPS® Architecture For Programmers Volume II-A:
>     The MIPS64® Instruction Set Reference Manual",
>     Imagination Technologies LTD, Revision 6.04, November 13, 2015
> 
> [2] "MIPS Architecture for Programmers Volume IV-j:
>     The MIPS32® SIMD Architecture Module",
>     Imagination Technologies LTD, Revision 1.12, February 3, 2016
> 
> Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
> ---
>  fpu/softfloat-specialize.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
> index e03a529..093218f 100644
> --- a/fpu/softfloat-specialize.h
> +++ b/fpu/softfloat-specialize.h
> @@ -97,7 +97,11 @@ float16 float16_default_nan(float_status *status)
>      if (status->snan_bit_is_one) {
>          return const_float16(0x7DFF);
>      } else {
> +#if defined(TARGET_MIPS)
> +        return const_float16(0x7E00);
> +#else
>          return const_float16(0xFE00);
> +#endif
>      }
>  #endif
>  }
> @@ -116,7 +120,11 @@ float32 float32_default_nan(float_status *status)
>      if (status->snan_bit_is_one) {
>          return const_float32(0x7FBFFFFF);
>      } else {
> +#if defined(TARGET_MIPS)
> +        return const_float32(0x7FC00000);
> +#else
>          return const_float32(0xFFC00000);
> +#endif
>      }
>  #endif
>  }
> @@ -135,7 +143,11 @@ float64 float64_default_nan(float_status *status)
>      if (status->snan_bit_is_one) {
>          return const_float64(LIT64(0x7FF7FFFFFFFFFFFF));
>      } else {
> +#if defined(TARGET_MIPS)
> +        return const_float64(LIT64(0x7FF8000000000000));
> +#else
>          return const_float64(LIT64(0xFFF8000000000000));
> +#endif
>      }
>  #endif
>  }

Reviewed-by: Leon Alrae <leon.alrae@imgtec.com>