[project @ 2003-03-26 15:56:25 by simonmar]

Add __attribute__((regparm(1))) to evacuate()'s prototype.  This
avoids a lot of stack assignments between scavenge() and
evacuate().  Performance isn't affected measurably, though.

diff --git a/ghc/rts/GC.c b/ghc/rts/GC.c
index c6744ed..429746a 100644 (file)
--- a/ghc/rts/GC.c
+++ b/ghc/rts/GC.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: GC.c,v 1.151 2003/03/26 14:52:02 simonmar Exp $
+ * $Id: GC.c,v 1.152 2003/03/26 15:56:25 simonmar Exp $
  *
  * (c) The GHC Team 1998-2003
  *
@@ -139,7 +139,14 @@ static lnat thunk_selector_depth = 0;
 
 static bdescr *     gc_alloc_block          ( step *stp );
 static void         mark_root               ( StgClosure **root );
-static StgClosure * evacuate                ( StgClosure *q );
+
+// Use a register argument for evacuate, if available.
+#if __GNUC__ >= 2
+static StgClosure * evacuate (StgClosure *q) __attribute__((regparm(1)));
+#else
+static StgClosure * evacuate (StgClosure *q);
+#endif
+
 static void         zero_static_object_list ( StgClosure* first_static );
 static void         zero_mutable_list       ( StgMutClosure *first );