[BLACKBOX] FW: [BLACKBOX] INTEGER arithmetic speed

From: Campbell, Robert (SELEX GALILEO, UK) <robert.d.campbell{([at]})nowhere.xy>
Date: Thu, 20 Oct 2011 10:11:09 +0100

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>> -----Original Message-----
>> From: Campbell, Robert (SELEX GALILEO, UK)
>> Sent: 20 October 2011 10:03
>> To: 'chris{([at]})nowhere.xy
>> Subject: RE: [BLACKBOX] INTEGER arithmetic speed
>>
>>
>>
>> >> -----Original Message-----
>> >> From: BlackBox [mailto:BLACKBOX{([at]})nowhere.xy
>> Behalf Of Chris
>> >> Burrows
>> >> Sent: 19 October 2011 22:25
>>
>> >> >Is this a freak result (maybe to do with cache boundaries or
>> >> >something), or is it a general situation that INTEGER
>> arithmetic is
>> >> >50% slower than LONGINT arithmetic?
>> >> >
>> >>
>> >> Just guessing - maybe this is a consequence of running on
>> a 64-bit
>> >> CPU? If that is what you are using try the same test on a 32-bit
>> >> system if you can find one,
>> >>
>> >> Regards,
>> >> Chris
>>
>>
>> What is a 64-bit CPU as opposed to a 32-but one?
>>
>> The 32-bit chips support the IA-32 Architecture (see
>> reference: Intel(r) 64 and IA-32 Architectures Software
>> Developer's Manual, Volume 1:, Basic Architecture - a free
>> 2.4 Mbyte pdf download).
>>
>> 64-bit chips support the Intel 64 architecture which
>> includes the IA-32 architecture, but also includes the new
>> "IA-32e mode with 64-bit sub-mode" which needs to be enabled
>> by the operating system on a code- segment basis (see para 3.1.1).
>>
>> So, I guess, unless this sub-mode is enabled a 64-bit chip
>> is merely a 32-bit chip + some unused transistors.
>>
>>
>> I suspect that most chips bought in the last 6 years are
>> 64-bit chips; at least for desktop machines.
>>
>>
>> I guess that Windows XP does not turn on the 64-bit sub-mode.
>> I guess that Windows XP 64 does not turn on the 64-bit
>> sub-mode when using WoW64.
>> I guess that the BlackBox compiler does not generate any
>> 64-bit instructions.
>>
>> So, I guess, the issue of 64-bit chips is not the answer.
>>
>>
>>
>> However I have now run my algorithm on two different systems:
>>
>> 1) BlackBox under WOW64 under Windows XP 64 using a dual
>> core 3-year old 64-bit AMD Family 15 Model 65 chip.
>>
>> 2) BlackBox under Windows XP using a single core 6-year old
>> 64-bit AMD Athlon chip.
>>
>>
>> The results were essentially identical!
>>
>>
>> Maybe it is an AMD thing, and Intel chips would tell a
>> different story. I don't buy Intel chips on principal
>> because of the way they handled the 'Pentium bug'.
>>
>>
>>
>> I too had heard that BlackBox uses the FPU for LONGINTs,
>> which seems like the most likely answer. I can't remember
>> where I heard the FPU story, or if it was a reliable source.
>>
>>
>> It would be interesting to know if anyone had observed this
>> LONGINT speed-up on an Intel machine.
>>
>>
>> Cheers
>>
>> Robert
>>
SELEX Galileo Ltd
Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL
A company registered in England & Wales. Company no. 02426132
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Received on Thu Oct 20 2011 - 11:11:09 UTC