ifc anomaly

ifc anomaly

yogvjosh's picture
yogvjosh
Tue, 06/10/2003 - 16:14

Hello users,

I saw following posting on comutational chemistry list (www.ccl.net)



http://www.ccl.net/cgi-bin/ccl/message.cgi?2003+06+09+006

I observed that on my platform (ifc 7.1 linux). Any comments ?

Thanks
Yogesh

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Steve Lionel (Intel)'s picture
Steve Lionel (Intel)
Tue, 06/10/2003 - 17:36

I'd expect code like that to have "anomolies" with optimization using any X86 compiler. Such sums are very sensitive to the use of extended-precision X87 registers and the order of operations.

Steve

Steve
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