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  • #16190

Closed
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Opened Jan 16, 2019 by Sylvain Henry@hsyl20Developer

Speed up handling of large String literals

The idea would to try the following optimization for literal strings by adding a pass in the simplifier that does:

  1. detect large string literals (> 2KB maybe? we would need to find a threshold)
  2. append large strings into a temporary binary file, remember their offset and size
  3. include the binary file into the compilation chain using ".incbin" in an assembler file (see the details here: https://hsyl20.fr/home/posts/2019-01-15-fast-file-embedding-with-ghc.html); add a fresh global module-specific symbol for the file, say "largestrings"
  4. replace Lit (Literal (LitString LARGE_BYTESTRING)) expressions with unpackNBytes# (plusAddr (CLabel "largestrings") offset) size
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Version 8.6.3
Type Task
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
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Reference: ghc/ghc#16190