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| author | Andrew Martin <andrew.thaddeus@gmail.com> | 2019-08-19 08:18:19 -0400 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2019-10-26 05:19:38 -0400 |
| commit | 8916e64e5437c99b82d5610286430328af1d86bc (patch) | |
| tree | 3c9f00fbed65cb725b57acb0ee7b83d776475a89 /includes/stg/MiscClosures.h | |
| parent | acedfc8b8706a92127c96f487e3e3b1636451704 (diff) | |
| download | haskell-8916e64e5437c99b82d5610286430328af1d86bc.tar.gz | |
Implement shrinkSmallMutableArray# and resizeSmallMutableArray#.
This is a part of GHC Proposal #25: "Offer more array resizing primitives".
Resources related to the proposal:
- Discussion: https://github.com/ghc-proposals/ghc-proposals/pull/121
- Proposal: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0025-resize-boxed.rst
Only shrinkSmallMutableArray# is implemented as a primop since a
library-space implementation of resizeSmallMutableArray# (in GHC.Exts)
is no less efficient than a primop would be. This may be replaced by
a primop in the future if someone devises a strategy for growing
arrays in-place. The library-space implementation always copies the
array when growing it.
This commit also tweaks the documentation of the deprecated
sizeofMutableByteArray#, removing the mention of concurrency. That
primop is unsound even in single-threaded applications. Additionally,
the non-negativity assertion on the existing shrinkMutableByteArray#
primop has been removed since this predicate is trivially always true.
Diffstat (limited to 'includes/stg/MiscClosures.h')
| -rw-r--r-- | includes/stg/MiscClosures.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/includes/stg/MiscClosures.h b/includes/stg/MiscClosures.h index 7a2ac2ef51..5b2364407f 100644 --- a/includes/stg/MiscClosures.h +++ b/includes/stg/MiscClosures.h @@ -367,6 +367,7 @@ RTS_FUN_DECL(stg_isByteArrayPinnedzh); RTS_FUN_DECL(stg_isMutableByteArrayPinnedzh); RTS_FUN_DECL(stg_shrinkMutableByteArrayzh); RTS_FUN_DECL(stg_resizzeMutableByteArrayzh); +RTS_FUN_DECL(stg_shrinkSmallMutableArrayzh); RTS_FUN_DECL(stg_casIntArrayzh); RTS_FUN_DECL(stg_newArrayzh); RTS_FUN_DECL(stg_newArrayArrayzh); |