From: Nicholas Clark <nick@ccl4.org>
Date: Sat, 2 Jul 2005 16:25:06 +0000 (+0000)
Subject: Copying the first parameter in the macro del_body seems to reduce
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=49c04cc736aa68243fdda5fe18290db6911dd403;p=p5sagit%2Fp5-mst-13.2.git

Copying the first parameter in the macro del_body seems to reduce
code size.  Presumably an expression is no longer evaluated twice.

p4raw-id: //depot/perl@25053
---

diff --git a/sv.c b/sv.c
index d416b1b..83c2d4e 100644
--- a/sv.c
+++ b/sv.c
@@ -1127,9 +1127,10 @@ S_new_body(pTHX_ void **arena_root, void **root, size_t size)
 
 #define del_body(thing, root)			\
     STMT_START {				\
+	void **thing_copy = (void **)thing;	\
 	LOCK_SV_MUTEX;				\
-	*(void **)thing = *root;		\
-	*root = (void*)thing;			\
+	*thing_copy = *root;			\
+	*root = (void*)thing_copy;		\
 	UNLOCK_SV_MUTEX;			\
     } STMT_END