title: How to enable Neon instruction in Xcode
body: <p>I want to use Neon SIMD instruction for the iphone. 
  I heard we have to put flags "-mfloat-abi=softfp -mfpu=neon" in the "Other C Flags" field of the Target inspector, but when building I get  "error: unrecognized command line option "-mfpu=neon"" .</p>
  
  <p>Is there anything else special that has to be done to allow this flag? (I have Xcode 3.2.1 and iphone sdk 3.1.3) </p>
  
  <p>Thanks !!</p>