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sav08:bitwidth_analysis [2008/05/20 18:57]
vkuncak
sav08:bitwidth_analysis [2008/05/20 23:59]
vkuncak
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 Given a language with signed 64 bit integers, determine as small as possible set of bits needed to store values of variables. Given a language with signed 64 bit integers, determine as small as possible set of bits needed to store values of variables.
   * e.g. if analysis derives that a subset of $\{0,​1,​2,​\ldots,​7\}$ is sufficient, then we can use //byte// type to store the value   * e.g. if analysis derives that a subset of $\{0,​1,​2,​\ldots,​7\}$ is sufficient, then we can use //byte// type to store the value
 +      * instead of having multiple integer types, we can have analysis infer the right '​subtypes'​ (ranges)
   * the analysis becomes even more important if we generate hardware from C code: analysis would enable us to save circuits and power   * the analysis becomes even more important if we generate hardware from C code: analysis would enable us to save circuits and power
  
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 \] \]
 ++++ ++++
 +
 +Is this the most precise rule possible? ++|No, consider adding only even numbers.++
  
 ===== References ===== ===== References =====