How to turn off Load pair Optimization or SWP?

[george_her]

ldfp instruction could load two contiguous single or double precision valuse from memory in one move,

DoesICC9.0 provideany option to turn this optimization off?

In the other hand, I could not find any option to turn off SWP

Software Pipelining in ICC9.0 .

Thanks

Message Edited by George_Her on 09-22-2005 01:50 AM

[TimP]

icc equivalent of ifort directive

#pragma noswp !DIR$ NOSWP



Look them up in the docs. If you want further help with C, use the C++ branch of the forum.

When the compiler decides to use load-pair, it usually makes a very large improvement in performance, much more than the schedule would indicate. You can prevent it by using -O1, or the pragma.
Searching the documents is cumbersome. icc/ifort 9.0 documentation expects you to copy the html files over to Windows. In the 8.1 documents, pragma noswp is covered in Compiler User's Guide > Vol II: Optimizing Applications > Optimization support features > Compiler Directives > Pipelining for Itanium

Message Edited by tim18 on 09-22-2005 09:19 AM