From 4b9cb9b5b4419207aca40040bd57a60d6e3734e1 Mon Sep 17 00:00:00 2001
From: Linus Nielsen Feltzing <linus@haxx.se>
Date: Sat, 24 Jul 2004 17:53:56 +0000
Subject: [PATCH] Don't copy the data section if src and dest are the same

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4935 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/crt0.S | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/firmware/crt0.S b/firmware/crt0.S
index 088ea0aff4..e33faa66e5 100644
--- a/firmware/crt0.S
+++ b/firmware/crt0.S
@@ -116,6 +116,9 @@ copy_l:
 	mov.l	datacopy_k,r0
 	mov.l	data_k,r1
 	mov.l	dataend_k,r2
+        /* Don't copy if src and dest are equal */
+        cmp/eq  r0,r1
+        bt      nodatacopy
 copy_l2:
 	mov.l	@r0,r3
 	mov.l	r3,@r1
@@ -124,7 +127,7 @@ copy_l2:
 	cmp/ge	r2,r1
 	bf	copy_l2
 	nop
-
+nodatacopy:
 	/* Munge the main thread stack */
 	mov.l	stack_k,r2
 	mov.l	deadbeef_k,r0