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Date:	Mon, 28 May 2012 17:06:46 -0400
From:	Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Is the Latest Release of Cygwin supported on Windows Server 8/2012
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This discussion went off-topic quite some time ago.

Please let this die.

cgf

On Sat, May 26, 2012 at 08:51:22PM -0400, Tim Prince wrote:
>On 05/26/2012 07:40 PM, Linda Walsh wrote:
>>
>>
>>     Every time you fetch a word or instruction that is not 8-byte 
>> aligned,
>> you force a fatal (but caught by the processor and/or OS) signal for 
>> unaligned
>> data.  That forces execution out of the pipeline (though not likely 
>> out of
>> cache, sadly, due to frequency of occurrence).  That's not counting 
>> the extra
>> cycles to fetch the rest of the data.  On some machines that can 
>> easily amount
>> to several dozen instructions worth.
>>
>There have been compilers for 32-bit Windows for 20 years which gave 
>8-byte alignments by default.  cygwin changed the default configure 
>parameter in binutils so as to support alignment about 8 years ago.  It 
>was tolerable to some before then as it matters only for 64-bit and 
>larger objects (doubles, and SSE, after that was introduced).  The 
>characteristics of the worst compiler (with respect to alignment) 
>available outside of cygwin don't have a bearing on this list.
>If the powers that be have decided that 64-bit mode should be supported 
>on cygwin setup.exe only by mingw cross compilers, I'll accept that.
>
>-- 
>Tim Prince
>
>
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