My daily readings 07/06/2012

    • u must provide a document from a 
      U.S. Federal, State, or local government agency that explains why you need a Social Security number 
      and that you meet all the requirements for the government benefit. NOTE: Most agencies do not require 
      that you have a Social Security number. Contact us to see if your reaso
    • Compilers for statically typed languages rely on type informa-
      tiontogenerateefficientmachinecode.Inadynamicallytypedpro-
      gramming language such as JavaScript, the types of expressions
      may vary at runtime. This means that the compiler can no longer
      easily transform operations into machine instructions that operate
      on one specific type. Without exact type information, the compiler
      must emit slower generalized machine code that can deal with all
      potential type combinations. While compile-time static type infer-
      ence might be able to gather type information to generate opti-
      mized machine code, traditional static analysis is very expensive
      and hence not well suited for the highly interactive environment of
    • Every compiled trace contains all the
      guards
      (checks) required
      to validate the speculation. If one of the guards fails (if control
      flow is different, or a value of a different type is generated), the
      trace exits. If an exit becomes hot, the VM can record a
      branch
      trace
      startingattheexittocoverthenewpath.Inthisway,theVM
      records a
      trace tree
      covering all the hot paths through the loop

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