From 59e40c2c25e4da778fe2c378bfb646ff6f6d29b3 Mon Sep 17 00:00:00 2001
From: simonmar <unknown>
Date: Wed, 26 Mar 2003 15:56:25 +0000
Subject: [PATCH] [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.

---
 ghc/rts/GC.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/ghc/rts/GC.c b/ghc/rts/GC.c
index c6744ed..429746a 100644
--- 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 );
 
-- 
1.7.10.4