Equality constraint solver is now externally pure

[ghc-hetmet.git] / compiler / utils / FastMutInt.lhs

diff --git a/compiler/utils/FastMutInt.lhs b/compiler/utils/FastMutInt.lhs
index 00aba34..c29b568 100644 (file)
--- a/compiler/utils/FastMutInt.lhs
+++ b/compiler/utils/FastMutInt.lhs
@@ -1,10 +1,14 @@
+\begin{code}
 {-# OPTIONS -cpp #-}
+{-# OPTIONS_GHC -O #-}
+-- We always optimise this, otherwise performance of a non-optimised
+-- compiler is severely affected
+
 --
 -- (c) The University of Glasgow 2002-2006
 --
 -- Unboxed mutable Ints
 
-\begin{code}
 module FastMutInt(
        FastMutInt, newFastMutInt,
        readFastMutInt, writeFastMutInt,
@@ -46,7 +50,7 @@ data FastMutInt = FastMutInt (MutableByteArray# RealWorld)
 newFastMutInt = IO $ \s ->
   case newByteArray# size s of { (# s, arr #) ->
   (# s, FastMutInt arr #) }
-  where I# size = SIZEOF_HSINT
+  where !(I# size) = SIZEOF_HSINT
 
 readFastMutInt (FastMutInt arr) = IO $ \s ->
   case readIntArray# arr 0# s of { (# s, i #) ->
@@ -61,7 +65,7 @@ data FastMutPtr = FastMutPtr (MutableByteArray# RealWorld)
 newFastMutPtr = IO $ \s ->
   case newByteArray# size s of { (# s, arr #) ->
   (# s, FastMutPtr arr #) }
-  where I# size = SIZEOF_VOID_P
+  where !(I# size) = SIZEOF_VOID_P
 
 readFastMutPtr (FastMutPtr arr) = IO $ \s ->
   case readAddrArray# arr 0# s of { (# s, i #) ->