Segmentation fault in ippsInflate_8u in zlib.

[amoka]

Hi,

I am trying to evaluate the IPP zlib implementation usingipp-samples_p_6.1.5.060 and IPP (both 6.1 and beta) . When trying to decompress a buffer in which 1 bit has been corrupted (I did this by randomly selecting a bit offset and XORing the data at that bit with itself), I see a segmentation fault in the function ippsInflate_8u. Is there something I can do as an immediate fix for this?

Lemme know if you need more info for fixing this.

~A

[Ying_H_Intel]

Hi A

We will investigate the problem. Could you providea small test case will be help for locating the problem quickly?

In addition, there is some ipp zlibreported and fixed in IPP 7.0 version (which is in Beta update 3).
IPP 7.0 beta update 3 bug fix list: http://software.intel.com/en-us/articles/intel-ipp-70-library-bug-fixes/

Would youplease try it and see if the error is fixed.
IPP 7.0 beta can be get from
http://software.intel.com/en-us/articles/intel-integrated-performance-primitives-intel-ipp-70-beta-program-homepage/

Regards,
Ying

[Naveen_G_Intel]

Hi,
How it works with IPP 7.0 Beta Update 3? Do you still have same issue with the latest release?

Thanks,
Naveen Gv

[Ying_H_Intel]

Hi Arti,

IPP 7.0 Update 2 is available now,the issue should be fixed in the vesion. please refer to bleow information to get more information

Version 7.0.2 of the Intel Integrated Performance Primitives (Intel IPP) library is now available. The library is available as a stand-alone product or as a component in Intel Parallel Studio 2011, Intel Parallel Studio XE 2011, Intel C++ Studio XE 2011, Intel Composer XE 2011, and Intel C++ Composer XE 2011. Please visit the Intel Software Evaluation Center to download evaluation versions of these and other Intel software products.

What's New in 7.0.2

• Additional optimizations for the 256-bit Intel AVX SIMD instruction set.
• Further Intel Atom Processor optimizations have been incorporated.
• Data compression gains of ~2x via a redesign of the "Inflate for Fixed Huffman" algorithm.
• Cryptography improvements include 1.4x faster "sign verify" and a 2x faster ippsMontForm() function.
• The ipp_zlib library is now based on the zlib 1.2.5 distribution.
• Review a complete list of changes, bug fixes and new features on-line.

Regards,

Ying H.