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Re: [Qemu-devel] [PATCH v2 16/24] softfloat: Add support for ties-away r


From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v2 16/24] softfloat: Add support for ties-away rounding
Date: Mon, 06 Jan 2014 10:36:22 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

On 01/06/2014 05:11 AM, Peter Maydell wrote:
> IEEE754-2008 specifies a new rounding mode:
> 
> "roundTiesToAway: the floating-point number nearest to the infinitely
> precise result shall be delivered; if the two nearest floating-point
> numbers bracketing an unrepresentable infinitely precise result are
> equally near, the one with larger magnitude shall be delivered."
> 
> Implement this new mode (it is needed for ARM). The general principle
> is that the required code is exactly like the ties-to-even code,
> except that we do not need to do the "in case of exact tie clear LSB
> to round-to-even", because the rounding operation naturally causes
> the exact tie to round up in magnitude.
> 
> Signed-off-by: Peter Maydell <address@hidden>
> ---
>  fpu/softfloat.c         | 54 
> +++++++++++++++++++++++++++++++++++++++++++++++++
>  include/fpu/softfloat.h |  3 ++-
>  2 files changed, 56 insertions(+), 1 deletion(-)

Reviewed-by: Richard Henderson <address@hidden>


r~



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