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| author | Ben Gamari <ben@smart-cactus.org> | 2016-07-04 20:09:07 -0400 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2016-07-04 20:09:07 -0400 |
| commit | 33ff4c10a824c08657a94bd9841f1ef57eeef419 (patch) | |
| tree | 3f7542aa0702296a712335becea2a137699f1dbe | |
| parent | c0037797a5e0e8a42b70cdd077d20b22b2e19d7e (diff) | |
| download | haskell-33ff4c10a824c08657a94bd9841f1ef57eeef419.tar.gz | |
Encoding: Attempt at reducing allocations
| -rw-r--r-- | compiler/utils/Encoding.hs | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/compiler/utils/Encoding.hs b/compiler/utils/Encoding.hs index d959671dd0..6028397cfd 100644 --- a/compiler/utils/Encoding.hs +++ b/compiler/utils/Encoding.hs @@ -115,17 +115,18 @@ utf8CharStart p = go p else return p utf8DecodeStringLazy :: BS.ByteString -> IO [Char] -utf8DecodeStringLazy bs - = unpack bs +utf8DecodeStringLazy !bs + = unpack 0 where - unpack bs - | BS.null bs = return [] + unpack !offset + | BS.null bs' = return [] | otherwise = - BS.unsafeUseAsCString bs $ \ptr -> + BS.unsafeUseAsCString bs' $ \ptr -> case utf8DecodeChar (castPtr ptr) of (c, nBytes) -> do - chs <- unsafeInterleaveIO $ unpack (BS.drop nBytes bs) + chs <- unsafeInterleaveIO $ unpack (offset + nBytes) return (c : chs) + where !bs' = BS.drop offset bs utf8DecodeString :: Ptr Word8 -> Int -> IO [Char] utf8DecodeString ptr len |