From: Laurent Vivier <lvivier@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
kvm@vger.kernel.org, kvm-ppc@vger.kernel.org
Cc: drjones@redhat.com, thuth@redhat.com, dgibson@redhat.com
Subject: Re: [kvm-unit-tests PATCH] powerpc: Add tests for RTAS
Date: Thu, 03 Mar 2016 13:02:01 +0000 [thread overview]
Message-ID: <56D835C9.5060506@redhat.com> (raw)
In-Reply-To: <56D831E5.2030604@redhat.com>
On 03/03/2016 13:45, Paolo Bonzini wrote:
>
>
> On 03/03/2016 13:28, Laurent Vivier wrote:
>> +
>> +#define DAYS(y,m,d) (365UL * (y) + ((y) / 4) - ((y) / 100) + ((y) / 400) + \
>> + 367UL * (m) / 12 + \
>
> Out of curiosity, where did you take this from? I knew the variant with
> 2447/80 instead of 367/12, but they give the same result, as checked
> with bc:
Some ideas from:
http://www.cantab.net/users/michael.behrend/algorithms/easter/pages/main.html
30*m + (7*(m+1) / 12)
reduced into
(360m + 7m + 7)/12 -> 367m/12
Laurent
> $ bc
> for (n=1;n<\x12;n++)2447*n/80-367*n/12;
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
>
> Paolo
>
>> + (d))
>> +
WARNING: multiple messages have this Message-ID (diff)
From: Laurent Vivier <lvivier@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
kvm@vger.kernel.org, kvm-ppc@vger.kernel.org
Cc: drjones@redhat.com, thuth@redhat.com, dgibson@redhat.com
Subject: Re: [kvm-unit-tests PATCH] powerpc: Add tests for RTAS
Date: Thu, 3 Mar 2016 14:02:01 +0100 [thread overview]
Message-ID: <56D835C9.5060506@redhat.com> (raw)
In-Reply-To: <56D831E5.2030604@redhat.com>
On 03/03/2016 13:45, Paolo Bonzini wrote:
>
>
> On 03/03/2016 13:28, Laurent Vivier wrote:
>> +
>> +#define DAYS(y,m,d) (365UL * (y) + ((y) / 4) - ((y) / 100) + ((y) / 400) + \
>> + 367UL * (m) / 12 + \
>
> Out of curiosity, where did you take this from? I knew the variant with
> 2447/80 instead of 367/12, but they give the same result, as checked
> with bc:
Some ideas from:
http://www.cantab.net/users/michael.behrend/algorithms/easter/pages/main.html
30*m + (7*(m+1) / 12)
reduced into
(360m + 7m + 7)/12 -> 367m/12
Laurent
> $ bc
> for (n=1;n<=12;n++)2447*n/80-367*n/12;
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 0
>
> Paolo
>
>> + (d))
>> +
next prev parent reply other threads:[~2016-03-03 13:02 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-25 21:19 [kvm-unit-tests PATCH] powerpc: Add tests for sPAPR h-calls Thomas Huth
2016-02-25 21:19 ` Thomas Huth
2016-02-29 0:38 ` David Gibson
2016-02-29 0:38 ` David Gibson
2016-03-03 12:28 ` [kvm-unit-tests PATCH] powerpc: Add tests for RTAS Laurent Vivier
2016-03-03 12:28 ` Laurent Vivier
2016-03-03 12:45 ` Paolo Bonzini
2016-03-03 12:45 ` Paolo Bonzini
2016-03-03 13:02 ` Laurent Vivier [this message]
2016-03-03 13:02 ` Laurent Vivier
2016-03-03 16:03 ` Radim Krčmář
2016-03-03 16:03 ` Radim Krčmář
2016-03-03 16:29 ` Paolo Bonzini
2016-03-03 16:29 ` Paolo Bonzini
2016-03-03 17:09 ` Radim Krčmář
2016-03-03 17:09 ` Radim Krčmář
2016-03-03 17:12 ` Paolo Bonzini
2016-03-03 17:12 ` Paolo Bonzini
2016-03-03 17:17 ` Radim Krčmář
2016-03-03 17:17 ` Radim Krčmář
2016-03-03 16:54 ` Thomas Huth
2016-03-03 16:54 ` Thomas Huth
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