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Re: [Qemu-devel] [PATCH v9 03/10] softfloat: For Mips only, correct defa
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [PATCH v9 03/10] softfloat: For Mips only, correct default NaN values |
Date: |
Thu, 23 Jun 2016 16:36:41 +0100 |
On 10 June 2016 at 10:57, Aleksandar Markovic
<address@hidden> wrote:
> From: Aleksandar Markovic <address@hidden>
>
> 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
>
> Reviewed-by: Leon Alrae <address@hidden>
> Signed-off-by: Aleksandar Markovic <address@hidden>
> ---
> fpu/softfloat-specialize.h | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
> index 981d665..a1bcb46 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
> }
These functions end up somewhat redundant after this --
MIPS is actually in the same boat as ARM, PPC, Alpha, etc --
so there's scope for cleanup here, but we can do that later
I think.
Reviewed-by: Peter Maydell <address@hidden>
thanks
-- PMM
- [Qemu-devel] [PATCH v9 00/10] IEEE 754-2008 support for Mips, Aleksandar Markovic, 2016/06/10
- [Qemu-devel] [PATCH v9 02/10] softfloat: Clean code format in fpu/softfloat-specialize.h, Aleksandar Markovic, 2016/06/10
- [Qemu-devel] [PATCH v9 03/10] softfloat: For Mips only, correct default NaN values, Aleksandar Markovic, 2016/06/10
- Re: [Qemu-devel] [PATCH v9 03/10] softfloat: For Mips only, correct default NaN values,
Peter Maydell <=
- [Qemu-devel] [PATCH v9 01/10] softfloat: Implement run-time-configurable meaning of signaling NaN bit, Aleksandar Markovic, 2016/06/10
- [Qemu-devel] [PATCH v9 04/10] softfloat: For Mips only, correct order in pickNaNMulAdd(), Aleksandar Markovic, 2016/06/10
- [Qemu-devel] [PATCH v9 05/10] linux-user: Update preprocessor constants for Mips-specific e_flags bits, Aleksandar Markovic, 2016/06/10
- [Qemu-devel] [PATCH v9 06/10] target-mips: Activate IEEE 754-2008 signaling NaN bit meaning for MSA, Aleksandar Markovic, 2016/06/10
- [Qemu-devel] [PATCH v9 07/10] target-mips: Add abs2008 flavor of <ABS|NEG>.<S|D>, Aleksandar Markovic, 2016/06/10
- [Qemu-devel] [PATCH v9 08/10] target-mips: Add nan2008 flavor of <CEIL|CVT|FLOOR|ROUND|TRUNC>.<L|W>.<S|D>, Aleksandar Markovic, 2016/06/10