#9577: String literals are wasting space -------------------------------------+------------------------------------- Reporter: xnyhps | Owner: xnyhps Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 7.8.2 (NCG) | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Runtime | Related Tickets: performance bug | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by xnyhps): Replying to [comment:15 carter]:
One question I've got about this whole thread is this: What would this improve? I'm trying to understand how this will impact application performance or binary sizes (though i understand the latter is defnitely neglible)
I think the performance loss for `[Char]`-strings is negligible: sharing means they are going to be unpacked just once, that's not worthy optimizing performance for. After unpacking the literal is never used again. `ByteString`s may have noticeable impact. Prepending a `ByteString` literal onto another `ByteString` involves a `memcpy` of the literal string. There might be code out there that does it millions of times. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9577#comment:19 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler