diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
 # Changelog for bits-extra
 
+# 0.0.1.3
+
+* Support GHC 7.10
+
 ## Unreleased changes
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,4 +1,6 @@
 # bits-extra
+[![CircleCI](https://circleci.com/gh/haskell-works/bits-extra.svg?style=svg)](https://circleci.com/gh/haskell-works/bits-extra)
+[![Travis](https://travis-ci.org/haskell-works/bits-extra.svg?branch=master)](https://travis-ci.org/haskell-works/bits-extra)
 
 Useful bitwise operations.
 
diff --git a/bench/Main.hs b/bench/Main.hs
--- a/bench/Main.hs
+++ b/bench/Main.hs
@@ -1,9 +1,10 @@
 module Main where
 
 import Criterion.Main
-import Data.Bits
 import Data.Bits.Pdep
+import Data.Bits.Pdep.Slow
 import Data.Bits.Pext
+import Data.Monoid         ((<>))
 import Data.Word
 
 import qualified Data.Vector.Storable as DVS
@@ -12,46 +13,32 @@
 mkVector w = return $ DVS.unfoldrN 1024 gen w
   where gen b = let a = b + 1 in Just (a, a)
 
-benchPopCount :: [Benchmark]
-benchPopCount =
-  [ env (mkVector (0 :: Word64)) $ \_ -> bgroup "popCount-single"
-    [ bench "popCount64"  (whnf popCount (0 :: Word64))
-    ]
-  , env (mkVector (0 :: Word32)) $ \_ -> bgroup "popCount-single"
-    [ bench "popCount32"  (whnf popCount (0 :: Word32))
-    ]
-  , env (mkVector (0 :: Word64)) $ \v -> bgroup "pdep-vector"
-    [ bench "popCount64"  (whnf (DVS.map popCount) v)
-    ]
-  , env (mkVector (0 :: Word32)) $ \v -> bgroup "pdep-vector"
-    [ bench "popCount32"  (whnf (DVS.map popCount) v)
-    ]
-  ]
-
-benchPlus :: [Benchmark]
-benchPlus =
-  [ env (mkVector (0 :: Word64)) $ \v -> bgroup "plus-vector"
-    [ bench "plus64"    (whnf (DVS.foldr (\a b -> (+) a 0 + b) 0) v)
-    ]
-  , env (mkVector (0 :: Word32)) $ \v -> bgroup "plus-vector"
-    [ bench "plus32"    (whnf (DVS.foldr (\a b -> (+) a 0 + b) 0) v)
-    ]
-  ]
-
 benchPdep :: [Benchmark]
 benchPdep =
   [ env (mkVector (0 :: Word64)) $ \_ -> bgroup "pdep-single"
-    [ bench "pdep64"    (whnf (pdep 0) (63 :: Word64))
+    [ bench "pdep64"      (whnf (pdep       0) (63 :: Word64))
+    , bench "pdep32"      (whnf (pdep       0) (63 :: Word32))
     ]
-  , env (mkVector (0 :: Word32)) $ \_ -> bgroup "pdep-single"
-    [ bench "pdep32"    (whnf (pdep 0) (63 :: Word32))
+  , env (mkVector (0 :: Word64)) $ \_ -> bgroup "pdep-slow"
+    [ bench "slowPdep64  8-bits"  (whnf (slowPdep  0x00000000000000ff) (0xff00000000000000 :: Word64))
+    , bench "slowPdep64 16-bits"  (whnf (slowPdep  0x000000000000ffff) (0xffff000000000000 :: Word64))
+    , bench "slowPdep64 32-bits"  (whnf (slowPdep  0x00000000ffffffff) (0xffffffff00000000 :: Word64))
+    , bench "slowPdep64 48-bits"  (whnf (slowPdep  0x0000ffffffffffff) (0xffffffffffff0000 :: Word64))
+    , bench "slowPdep64 64-bits"  (whnf (slowPdep  0xffffffffffffffff) (0xffffffffffffffff :: Word64))
     ]
-  , env (mkVector (0 :: Word64)) $ \v -> bgroup "pdep-vector"
+  ]
+
+benchPdepVector :: [Benchmark]
+benchPdepVector =
+  [ env (mkVector (0 :: Word64)) $ \v -> bgroup "pdep-vector"
     [ bench "pdep64"    (whnf (DVS.foldr (\a b -> pdep a 0 + b) 0) v)
     ]
   , env (mkVector (0 :: Word32)) $ \v -> bgroup "pdep-vector"
     [ bench "pdep32"    (whnf (DVS.foldr (\a b -> pdep a 0 + b) 0) v)
     ]
+  , env (mkVector (0 :: Word64)) $ \v -> bgroup "pdep-vector"
+    [ bench "pdep64"    (whnf (DVS.foldr (\a b -> pdep a 0 + b) 0) v)
+    ]
   ]
 
 benchPext :: [Benchmark]
@@ -62,7 +49,11 @@
   , env (mkVector (0 :: Word32)) $ \_ -> bgroup "pext-single"
     [ bench "pext32"    (whnf (pext 0) (63 :: Word64))
     ]
-  , env (mkVector (0 :: Word64)) $ \v -> bgroup "pext-vector"
+  ]
+
+benchPextVector :: [Benchmark]
+benchPextVector =
+  [ env (mkVector (0 :: Word64)) $ \v -> bgroup "pext-vector"
     [ bench "pext64"    (whnf (DVS.foldr (\a b -> pext a 0 + b) 0) v)
     ]
   , env (mkVector (0 :: Word32)) $ \v -> bgroup "pext-vector"
@@ -71,7 +62,11 @@
   ]
 
 benchAll :: [Benchmark]
-benchAll = benchPopCount <> benchPdep <> benchPext <> benchPlus
+benchAll = mempty
+  <> benchPdep
+  <> benchPext
+  <> benchPdepVector
+  <> benchPextVector
 
 main :: IO ()
 main = do
diff --git a/bits-extra.cabal b/bits-extra.cabal
--- a/bits-extra.cabal
+++ b/bits-extra.cabal
@@ -1,12 +1,14 @@
--- This file has been generated from package.yaml by hpack version 0.20.0.
+-- This file has been generated from package.yaml by hpack version 0.27.0.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: dbcbb459a6eb5b7d8dadf5907153e09aeafa1d85fbef3d1cfcf6c02f025f0348
+-- hash: 2b570cc02c2669976f9b6116039e2b03b4942f905bf19228b08ea28cae3edcca
 
 name:           bits-extra
-version:        0.0.1.2
+version:        0.0.1.3
+synopsis:       Useful bitwise operations
 description:    Please see the README on Github at <https://github.com/haskell-works/bits-extra#readme>
+category:       Data, Serialization
 homepage:       https://github.com/haskell-works/bits-extra#readme
 bug-reports:    https://github.com/haskell-works/bits-extra/issues
 author:         John Ky
@@ -16,6 +18,7 @@
 license-file:   LICENSE
 build-type:     Simple
 cabal-version:  >= 1.10
+tested-with:    GHC == 8.4.2, GHC == 8.2.2, GHC == 8.0.2, GHC == 7.10.3
 
 extra-source-files:
     ChangeLog.md
@@ -31,17 +34,6 @@
   default: False
 
 library
-  hs-source-dirs:
-      src
-  other-extensions: TypeApplications
-  ghc-options: -Wall -O2
-  build-depends:
-      base >=4.7 && <5
-    , ghc-prim
-    , vector
-  if (flag(bmi2)) && (impl(ghc >=8.4.1))
-    ghc-options: -mbmi2 -msse4.2
-    cpp-options: -DBMI2_ENABLED
   exposed-modules:
       Data.Bits.BitSize
       Data.Bits.Pdep
@@ -52,16 +44,30 @@
       Data.Bits.Pdep.Prim
       Data.Bits.Pext.Prim
       Paths_bits_extra
+  hs-source-dirs:
+      src
+  ghc-options: -Wall -O2
+  build-depends:
+      base >=4.8 && <5
+    , ghc-prim
+    , vector
+  if (flag(bmi2)) && (impl(ghc >=8.4.1))
+    ghc-options: -mbmi2 -msse4.2
+    cpp-options: -DBMI2_ENABLED
   default-language: Haskell2010
 
 test-suite bits-extra-test
   type: exitcode-stdio-1.0
   main-is: Spec.hs
+  other-modules:
+      Data.Bits.PdepSpec
+      Data.Bits.PextSpec
+      Paths_bits_extra
   hs-source-dirs:
       test
   ghc-options: -threaded -rtsopts -with-rtsopts=-N
   build-depends:
-      base >=4.11 && <5
+      base >=4.8 && <5
     , bits-extra
     , ghc-prim
     , hedgehog
@@ -70,26 +76,23 @@
     , hw-hspec-hedgehog
   if (flag(bmi2)) && (impl(ghc >=8.4.1))
     ghc-options: -mbmi2 -msse4.2
-  other-modules:
-      Data.Bits.PdepSpec
-      Data.Bits.PextSpec
-      Paths_bits_extra
   default-language: Haskell2010
+  build-tool-depends: hspec-discover:hspec-discover
 
 benchmark bench
   type: exitcode-stdio-1.0
   main-is: Main.hs
+  other-modules:
+      Paths_bits_extra
   hs-source-dirs:
       bench
   ghc-options: -Wall -O2
   build-depends:
-      base >=4 && <5
+      base >=4.8 && <5
     , bits-extra
     , criterion
     , ghc-prim
     , vector
   if (flag(bmi2)) && (impl(ghc >=8.4.1))
     ghc-options: -mbmi2 -msse4.2
-  other-modules:
-      Paths_bits_extra
   default-language: Haskell2010
diff --git a/src/Data/Bits/BitSize.hs b/src/Data/Bits/BitSize.hs
--- a/src/Data/Bits/BitSize.hs
+++ b/src/Data/Bits/BitSize.hs
@@ -1,5 +1,4 @@
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TypeApplications    #-}
 
 module Data.Bits.BitSize where
 
@@ -78,5 +77,5 @@
   {-# INLINE bitSize #-}
 
 instance forall a. (BitSize a, DVS.Storable a) => BitSize (DVS.Vector a) where
-  bitSize v = DVS.length v * bitSize @a undefined
+  bitSize v = DVS.length v * bitSize (undefined :: a)
   {-# INLINE bitSize #-}
diff --git a/src/Data/Bits/Pdep.hs b/src/Data/Bits/Pdep.hs
--- a/src/Data/Bits/Pdep.hs
+++ b/src/Data/Bits/Pdep.hs
@@ -1,5 +1,4 @@
-{-# LANGUAGE CPP       #-}
-{-# LANGUAGE MagicHash #-}
+{-# LANGUAGE CPP #-}
 
 module Data.Bits.Pdep
   ( Pdep(..)