#11143: Feature request: Add index/read/write primops with byte offset for ByteArray# -------------------------------------+------------------------------------- Reporter: vagarenko | Owner: sjakobi Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Resolution: | Keywords: newcomers Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4433 Wiki Page: | -------------------------------------+------------------------------------- Comment (by sjakobi): Replying to [comment:11 vagarenko]:
I don't understand. What is total offset? What are `byte_offset` and `type_offset`?
By `byte_offset` you mean number of bytes from the start of the array `ba` to the sought value of type `Int#`, correct?
Then what is `type_offset`? Number of `Int16` elements before the sought element? But my motivation for this ticket was to be able to store values of different types in a `ByteArray#`.
Yes, sorry for my lack of clarity and thanks for putting it in a nutshell! What I assume is [comment:2 Mathnerd314]'s motivation is that even when a `ByteArray#` contains several types, it may contain a sequence of values of the same type. For example you may want to serialize a vector of `Int32`s by first writing the length of the vector as a `Word64` followed by the values. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11143#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler