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| author | Ben Gamari <ben@smart-cactus.org> | 2016-07-04 20:33:57 -0400 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2016-07-05 09:56:34 +0200 |
| commit | 84b135695d79c2c416b7746ebad8f39f9d2ab57e (patch) | |
| tree | 64c9e3f95fb250ab5ad899aa78669b80585587e8 | |
| parent | dd3080fe0263082f65bf2570f49189c277b12e28 (diff) | |
| download | haskell-wip/T12357-concat.tar.gz | |
FastString: Reduce allocations of concatFSwip/T12357-concat
Instead of unpacking and then repacking we simply concatenate all of the
individual ByteStrings.
| -rw-r--r-- | compiler/utils/FastString.hs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/utils/FastString.hs b/compiler/utils/FastString.hs index 40c3882b87..407c185ee8 100644 --- a/compiler/utils/FastString.hs +++ b/compiler/utils/FastString.hs @@ -513,7 +513,7 @@ appendFS fs1 fs2 = mkFastStringByteString (fastStringToByteString fs2) concatFS :: [FastString] -> FastString -concatFS ls = mkFastString (Prelude.concat (map unpackFS ls)) -- ToDo: do better +concatFS = mkFastStringByteString . BS.concat . map fs_bs headFS :: FastString -> Char headFS (FastString _ 0 _ _) = panic "headFS: Empty FastString" |