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Merge pull request #4940 from elopio/patch-6

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Clarify a little the function hoister optimization
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chriseth 2018-09-11 03:01:15 +02:00 committed by GitHub
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libjulia/optimiser/README.md
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@ -24,9 +24,9 @@ a new identifier needs to be introduced, a new unique name is generated.
## Function Hoister ## Function Hoister
The function hoister moves all function definitions to the topmost block. This is The function hoister moves all function definitions to the end of the topmost block. This is
a semantically equivalent transformation as long as it is performed after the a semantically equivalent transformation as long as it is performed after the
disambiguation stage. The reason is that moving a definition upwards cannot decrease disambiguation stage. The reason is that moving a definition to a higher-level block cannot decrease
its visibility and it is impossible to reference variables defined in a different function. its visibility and it is impossible to reference variables defined in a different function.
The benefit of this stage is that function definitions can be looked up more easily. The benefit of this stage is that function definitions can be looked up more easily.