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Re: [Qemu-devel] [PATCH v2] softfloat: add float128_is_{normal, denormal
From: |
Richard Henderson |
Subject: |
Re: [Qemu-devel] [PATCH v2] softfloat: add float128_is_{normal, denormal} |
Date: |
Wed, 6 Feb 2019 09:39:46 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 |
On 2/6/19 9:10 AM, David Hildenbrand wrote:
> Needed on s390x, to test for the data class of a number. So it will
> gain soon a user.
>
> A number is considered normal if the exponent is neither 0 nor all 1's.
> That can be checked by adding 1 to the exponent, and comparing against
>> = 2 after dropping an eventual overflow into the sign bit.
> While at it, convert the other floatXX_is_normal functions to use a
> similar, less error prone calculation, as suggested by Richard H.
>
> Signed-off-by: David Hildenbrand <address@hidden>
> ---
> include/fpu/softfloat.h | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
Reviewed-by: Richard Henderson <address@hidden>
r~