can't run NEON normally

Note: This was originally posted on 13th April 2010 at http://forums.arm.com

hi all,
       I want to use the latest realview IDE to do some NEON program.My program can build normally,but when I debug,the NEON instructions can't be excuted,and my program is over.I am a new learner of ARM.Who can help me?
       Thank you.
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