• Top
    • Documentation
    • Books
    • Boolean-reasoning
    • Projects
    • Debugging
    • Std
    • Proof-automation
    • Macro-libraries
    • ACL2
      • Theories
      • Rule-classes
      • Proof-builder
      • Recursion-and-induction
      • Hons-and-memoization
      • Events
      • Parallelism
      • History
      • Programming
        • Defun
        • Declare
        • System-utilities
        • Stobj
        • State
        • Mutual-recursion
        • Memoize
        • Mbe
        • Io
        • Defpkg
        • Apply$
        • Loop$
        • Programming-with-state
        • Arrays
        • Characters
        • Time$
        • Defmacro
        • Loop$-primer
        • Fast-alists
        • Defconst
        • Evaluation
        • Guard
        • Equality-variants
        • Compilation
        • Hons
        • ACL2-built-ins
        • Developers-guide
          • Developers-guide-background
          • Developers-guide-maintenance
          • Developers-guide-build
          • Developers-guide-utilities
          • Developers-guide-logic
          • Developers-guide-evaluation
          • Developers-guide-programming
          • Developers-guide-introduction
          • Developers-guide-extending-knowledge
          • Developers-guide-examples
          • Developers-guide-contributing
          • Developers-guide-prioritizing
          • Developers-guide-other
          • Developers-guide-emacs
          • Developers-guide-style
          • Developers-guide-miscellany
            • Developers-guide-releases
            • Developers-guide-ACL2-devel
            • Developers-guide-pitfalls
          • System-attachments
          • Advanced-features
          • Set-check-invariant-risk
          • Numbers
          • Efficiency
          • Irrelevant-formals
          • Introduction-to-programming-in-ACL2-for-those-who-know-lisp
          • Redefining-programs
          • Lists
          • Invariant-risk
          • Errors
          • Defabbrev
          • Conses
          • Alists
          • Set-register-invariant-risk
          • Strings
          • Program-wrapper
          • Get-internal-time
          • Basics
          • Packages
          • Oracle-eval
          • Defmacro-untouchable
          • <<
          • Primitive
          • Revert-world
          • Unmemoize
          • Set-duplicate-keys-action
          • Symbols
          • Def-list-constructor
          • Easy-simplify-term
          • Defiteration
          • Fake-oracle-eval
          • Defopen
          • Sleep
        • Operational-semantics
        • Real
        • Start-here
        • Debugging
        • Miscellaneous
        • Output-controls
        • Macros
        • Interfacing-tools
      • Interfacing-tools
      • Hardware-verification
      • Software-verification
      • Math
      • Testing-utilities
    • Developers-guide

    Developers-guide-miscellany

    Miscellaneous Information

    The initial version of this chapter is little more than a stub. It will probably always benefit from expansion to cover more topics.

    Trust tags

    See defttag for user-level information about trust tags. The ``Essay on Trust Tags (Ttags)'' provides a lot of relevant background on trust tags at the implementation level. A particularly important point to be emphasized here is the following: The critical aspect of trust tags is that whenever a trust tag is activated, the string "TTAG NOTE" must be printed to *standard-co* (see the definition of print-ttag-note), with the exception that if ttag notes are deferred then initially, only the first such is printed; see set-deferred-ttag-notes. The paper ``Hacking and Extending ACL2'' from the 2007 ACL2 Workshop may be helpful.

    Fixnums

    In general, Common Lisp computations with numbers are much faster when they only deal with ``small'' numbers called fixnums. See the ``Essay on Fixnum Declarations'' for information about fixnums and ACL2, including a description of the ranges for 32-bit fixnums in different Common Lisp implementations as of this writing. There may be some opportunities made available by modern Lisps that have 64-bit implementations. (CMUCL seems to be an exception.)

    NEXT SECTION: developers-guide-releases