[project @ 2001-05-21 14:05:04 by simonmar]

minor performance improvement

diff --git a/ghc/lib/std/PrelIO.hsc b/ghc/lib/std/PrelIO.hsc
index 0292fdf..4eeaad1 100644 (file)
--- a/ghc/lib/std/PrelIO.hsc
+++ b/ghc/lib/std/PrelIO.hsc
@@ -3,7 +3,7 @@
 #undef DEBUG_DUMP
 
 -- -----------------------------------------------------------------------------
--- $Id: PrelIO.hsc,v 1.1 2001/05/18 16:54:05 simonmar Exp $
+-- $Id: PrelIO.hsc,v 1.2 2001/05/21 14:05:04 simonmar Exp $
 --
 -- (c) The University of Glasgow, 1992-2001
 --
@@ -451,13 +451,13 @@ hPutStr handle str = do
 
 
 getSpareBuffer :: Handle__ -> IO (BufferMode, Buffer)
-getSpareBuffer handle_ = do
-   let mode = haBufferMode handle_
+getSpareBuffer Handle__{haBuffer=ref, 
+                       haBuffers=spare_ref,
+                       haBufferMode=mode}
+ = do
    case mode of
      NoBuffering -> return (mode, error "no buffer!")
      _ -> do
-         let spare_ref = haBuffers handle_
-             ref = haBuffer handle_
           bufs <- readIORef spare_ref
          buf  <- readIORef ref
          case bufs of