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Strength reduce x quotRem 8 #8

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Merged
winterland1989 merged 1 commit into from
Nov 30, 2016
Merged

Strength reduce x quotRem 8 #8

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12 changes: 8 additions & 4 deletions Database/MySQL/Protocol/MySQLValue.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -530,8 +530,9 @@ newtype BitMap = BitMap { fromBitMap :: ByteString } deriving (Eq, Show)
--
isColumnSet :: BitMap -> Int -> Bool
isColumnSet (BitMap bitmap) pos =
let (i, j) = pos `quotRem` 8
in (bitmap `B.unsafeIndex` i) `testBit` j
let i = pos `unsafeShiftR` 3
j = pos .&. 7
in (bitmap `B.unsafeIndex` i) `testBit` j
{-# INLINE isColumnSet #-}

-- | Test if a column is null(binary protocol).
Expand All @@ -540,8 +541,11 @@ isColumnSet (BitMap bitmap) pos =
--
isColumnNull :: BitMap -> Int -> Bool
isColumnNull (BitMap nullmap) pos =
let (i, j) = (pos + 2) `quotRem` 8
in (nullmap `B.unsafeIndex` i) `testBit` j
let
pos' = pos + 2
i = pos' `unsafeShiftR` 3
j = pos' .&. 7
in (nullmap `B.unsafeIndex` i) `testBit` j
{-# INLINE isColumnNull #-}

-- | Make a nullmap for params(binary protocol) without offset.
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