topic Hi Sergey, in Intel® Integrated Performance Primitives

CPU Properties Problem

adem_metin_cali — Thu, 29 Aug 2013 12:49:31 GMT

Hi all,

I have a i7-Q720 cpu.But when i run the code that is in attachment and i find it in the Intel Ipp7.1 users guide,i see wrong informations.According to the code's output,my cpu does not support SSE2,SSE3,SSSE3,SSE41 and SSE42.But according to the intel web page(http://ark.intel.com/products/43122/Intel-Core-i7-720QM-Processor-6M-Cache-1_60-GHz), i have SSE42 instruction set.I use visual studio 12 and ipp7.1.1(r37466).What is the reason of this situation???

Adem Metin CALI

Please take a look at a

SergeyKostrov — Thu, 29 Aug 2013 14:34:23 GMT

Please take a look at a comment in ippcore.h header file: ... /* // Name: ippGetEnabledCpuFeatures // Purpose: Detects unabled features for loaded libraries // Returns: Features mask // Features mask values are defined in the ippdefs.h ... */ IPPAPI( Ipp64u, ippGetEnabledCpuFeatures, ( void ) ) ... i7-Q720 CPU supports SSE2, SSE3, SSSE3, SSE41 and SSE42 instruction sets.

Hi Sergey,

adem_metin_cali — Fri, 30 Aug 2013 08:15:20 GMT

Hi Sergey,

First of all thanks for your interest.I looked in ippcore.h and i understand what you meant.When i run the program with default linking method and multithreaded static library,i get wrong results,but when i run the program with single threaded static library, iget right result.Is it about that multithreaded static library is deprecated???

Adem Metin CALI

>>...when i run the program

SergeyKostrov — Fri, 30 Aug 2013 12:16:04 GMT

>>...when i run the program with single threaded static library, iget right result.Is it about that multithreaded static >>library is deprecated? It is very strange and results should be identical.

No Sergey, results are not

adem_metin_cali — Fri, 30 Aug 2013 12:37:30 GMT

No Sergey, results are not identical,i checked it twice.When i run the program with default linking method or multithreaded static linking,i get wrong results.But when irun the program with single threaded linking method,i get the right results.

Adem Metin CALI

Please post a final version

SergeyKostrov — Fri, 30 Aug 2013 12:49:31 GMT

Please post a final version of your test-case. Thanks in advance.

Thanks again for your

adem_metin_cali — Sat, 31 Aug 2013 19:09:02 GMT

Thanks again for your interest and sorry for my delay Sergey.I put the screenshots of the exes and the codes.You can easily understand their linking methods with their names.And good luck with that...

Adem Metin CALI

Could you try to do it in a

SergeyKostrov — Sat, 31 Aug 2013 22:30:00 GMT

Could you try to do it in a different way ( or something like this )? [ Additional Test 1 ] ... ... (( fn & ippCPUID_SSE2 ) != 0) ? 'Y' : 'N'... ... (( fn & ippCPUID_SSE3 ) != 0) ? 'Y' : 'N'... ... (( fn & ippCPUID_SSSE3 ) != 0) ? 'Y' : 'N'... ... (( fn & ippCPUID_SSE41 ) != 0) ? 'Y' : 'N'... ... (( fn & ippCPUID_SSE42 ) != 0) ? 'Y' : 'N'... ... or [ Additional Test 2 ] ... ipp32u iMask = ( ipp32u )fn; ... (( iMask & ippCPUID_SSE2 ) != 0) ? 'Y' : 'N'... ... (( iMask & ippCPUID_SSE3 ) != 0)? 'Y' : 'N'... ... (( iMask & ippCPUID_SSSE3 ) != 0) ? 'Y' : 'N'... ... (( iMask & ippCPUID_SSE41 ) != 0) ? 'Y' : 'N'... ... (( iMask & ippCPUID_SSE42 ) != 0) ? 'Y' : 'N'... ... Take into account that explicit '... != 0' is used. It also makes sense to verify the same bits extractions in VS Watch Window. It is still Not clear if this is a bug in IPP or in Microsoft C++ compiler.

Hi Sergey,

adem_metin_cali — Sat, 31 Aug 2013 23:04:30 GMT

Hi Sergey,

i run the tests and results are same.Without single threaded static library i can not see the right properties of my cpu.i put the results screen shots in attachment.

Adem Metin CALI

Thank for the update and I

SergeyKostrov — Sun, 01 Sep 2013 00:15:56 GMT

Thank for the update and I will take a look at your test case next week.

I thank you Sergey.You strive

adem_metin_cali — Sun, 01 Sep 2013 09:46:58 GMT

I thank you Sergey.You strive very much.I think that this situation is about deprecation of multithraded version of ipp.

Adem Metin CALI

>>...I think that this

SergeyKostrov — Mon, 02 Sep 2013 15:01:58 GMT

>>...I think that this situation is about deprecation of multithraded version of ipp. A deprecation period for some functionality is for about 2 years. Even if some IPP functions are marked as deprecated it doesn't mean that they are removed. However some issues are always possible. I'll keep you informed about results of my tests.

I think you're mixing support

SergeyKostrov — Tue, 03 Sep 2013 00:04:08 GMT

I think you're mixing support of some Intel instruction sets for a CPU with support of some Intel instruction sets for IPP library. For example, let's say you have a latest Intel CPU, like Haswell, which supports all officially released Intel instruction sets. When it comes to IPP at a lowest level different Waterfall DLLs could be used and because of this calls to ippGetEnabledCpuFeatures will show what features of IPP (!) are supported after some Waterfall DLL is loaded ( but something is wrong in case of static linking / you're right here ). In another words, ippGetCpuFeatures is for detecting supported Intel instruction sets, or features, and ippGetEnabledCpuFeatures is for detecting supported Intel instruction sets in IPP, once again, because different Waterfall DLLs could be used with the same application in case of dynamic linking ( again, something is wrong in case of static linking / you're right here ).

Continued...

SergeyKostrov — Tue, 03 Sep 2013 00:09:57 GMT

Continued... I created my own test-case and tested it on two systems with Ivy Bridge and Pentium 4 CPUs using Intel C++ compilers v12.x and v13.x. I confirm that something is wrong and here are results: Outputs on an Ivy Bridge system: IPP version: 7.1.1 [ Dynamic linking built with ICC v13.x ] Is IPP SSE feature enabled: 1 Is IPP SSE2 feature enabled: 0 Is IPP SSE3 feature enabled: 0 Is IPP SSE4.1 feature enabled: 0 Is IPP SSE4.2 feature enabled: 0 [ Static linking built with ICC v13.x ] Is IPP SSE feature enabled: 1 Is IPP SSE2 feature enabled: 1 Is IPP SSE3 feature enabled: 1 Is IPP SSE4.1 feature enabled: 1 Is IPP SSE4.2 feature enabled: 1 Outputs on a Pentium 4 system: IPP version: 7.0.205 [ Dynamic linking built with ICC v12.x ] Is IPP SSE feature enabled: 1 Is IPP SSE2 feature enabled: 0 Is IPP SSE3 feature enabled: 0 Is IPP SSE4.1 feature enabled: 0 Is IPP SSE4.2 feature enabled: 0 [ Static linking built with ICC v12.x ] Is IPP SSE feature enabled: 1 Is IPP SSE2 feature enabled: 1 Is IPP SSE3 feature enabled: 0 Is IPP SSE4.1 feature enabled: 0 Is IPP SSE4.2 feature enabled: 0 A test-case is attached.

>>...i see wrong informations

SergeyKostrov — Tue, 03 Sep 2013 00:14:46 GMT

>>...i see wrong informations.According to the code's output,my cpu does not support SSE2,SSE3,SSSE3, >>SSE41 and SSE42... I'd like to go back to your first question and my question is: What do you want to verify, that is, supported Intel CPU instruction sets or supported IPP features?

Hi Sergey,

adem_metin_cali — Tue, 03 Sep 2013 05:42:23 GMT

Hi Sergey,

According to Intel Integrated Performance Primitives for Windows* OS User's Guide IPP7.1 (318254-016US) on page 15 and 16,the output of the example code is the hardware optimizations used by this library layer.Actually, i want to see the supported intel cpu instruction sets because my cpu is older than ipp version.

I know that this question is irrelevant but why do you use scope resolution operator with ippInit function??? does it have a special purpose???As i know ipp is a C library and every function that you include in your source file is in global scope.In addition scope resolution operator is a C++ operator. Thanks again for your interest.With my best regard.

Adem Metin CALI

>>...i want to see the

SergeyKostrov — Tue, 03 Sep 2013 11:56:51 GMT

>>...i want to see the supported intel cpu instruction sets... In that case use ippGetCpuFeatures function.

>>...i want to see the

SergeyKostrov — Tue, 03 Sep 2013 11:57:23 GMT

>>...i want to see the supported intel cpu instruction sets... In that case use ippGetCpuFeatures function.

Ok, I understood that

adem_metin_cali — Tue, 03 Sep 2013 12:40:55 GMT

Ok, I understood that ippGetEnabledCpuFeatures gives the supported cpu features for library and ippGetCpuFeatures gives the cpu features.My first question is that am i wrong for my first sentence and second question is that does intel gurantees performance with a upper instruction set ???

Adem Metin CALI

You should use ippStaticInit

SergeyKostrov — Wed, 04 Sep 2013 12:42:10 GMT

You should use ippStaticInit or ippInit for automatic selection the highest Intel instruction set supported by a CPU. If automatic selection is Not needed ( a developer controls initialization ) then ippStaticInitCpu or ippInitCpu need to be used. Also, take a look at ippEnableCpu since it allows to select a target CPU ( see enumeration IppCpuType in ippdefs.h ) >>...does intel gurantees performance with a upper instruction set ?.. Yes.