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- Global_value_numbering abstract "Global value numbering (GVN) is a compiler optimization based on the SSA intermediate representation. It sometimes helps eliminate redundant code that common subexpression elimination (CSE) does not. At the same time, however, CSE may eliminate code that GVN does not, so both are often found in modern compilers. Global value numbering is distinct from local value numbering in that the value-number mappings hold across basic block boundaries as well, and different algorithms are used to compute the mappings.Global value numbering works by assigning a value number to variables and expressions. To those variables and expressions which are provably equivalent, the same value number is assigned. For instance, in the following code:w := 3x := 3y := x + 4z := w + 4a good GVN routine would assign the same value number to w and x, and the same value number to y and z. For instance, the map would constitute an optimal value-number mapping for this block.Using this information, the previous code fragment may be safely transformed into:w := 3x := wy := w + 4z := yDepending on the code following this fragment, copy propagation may be able to remove the assignments to x and to zThe reason that GVN is sometimes more powerful than CSE comes from the fact that CSE matches lexically identical expressions whereas the GVN tries to determine an underlying equivalence. For instance, in the code:a := c × de := cf := e × dWithout copy propagation, CSE would not eliminate the recomputation assigned to f, but even a poor GVN algorithm should discover and eliminate this redundancy.SSA form is required to perform GVN[citation needed] so that false {variable name → value name} mappings are not created.".
- Global_value_numbering wikiPageID "547807".
- Global_value_numbering wikiPageRevisionID "578534586".
- Global_value_numbering hasPhotoCollection Global_value_numbering.
- Global_value_numbering subject Category:Compiler_optimizations.
- Global_value_numbering type Abstraction100002137.
- Global_value_numbering type Act100030358.
- Global_value_numbering type Action100037396.
- Global_value_numbering type Change100191142.
- Global_value_numbering type ChangeOfState100199130.
- Global_value_numbering type CompilerOptimizations.
- Global_value_numbering type Event100029378.
- Global_value_numbering type Improvement100248977.
- Global_value_numbering type Optimization100260051.
- Global_value_numbering type PsychologicalFeature100023100.
- Global_value_numbering type YagoPermanentlyLocatedEntity.
- Global_value_numbering comment "Global value numbering (GVN) is a compiler optimization based on the SSA intermediate representation. It sometimes helps eliminate redundant code that common subexpression elimination (CSE) does not. At the same time, however, CSE may eliminate code that GVN does not, so both are often found in modern compilers.".
- Global_value_numbering label "Global value numbering".
- Global_value_numbering label "Нумерация значений".
- Global_value_numbering label "大域値番号付け".
- Global_value_numbering sameAs 大域値番号付け.
- Global_value_numbering sameAs m.02nvcm.
- Global_value_numbering sameAs Q5570914.
- Global_value_numbering sameAs Q5570914.
- Global_value_numbering sameAs Global_value_numbering.
- Global_value_numbering wasDerivedFrom Global_value_numbering?oldid=578534586.
- Global_value_numbering isPrimaryTopicOf Global_value_numbering.