From: Matthias Weisser <weisserm@arcor.de>
Date: Sun, 22 May 2011 23:06:50 +0000 (+0000)
Subject: arm: lib: memcpy: Do not copy to same address
X-Git-Tag: v2011.09-rc1~68^2~132
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=34fe8281d7323784544e94d2f7218f52b8a2899d;p=oweals%2Fu-boot.git

arm: lib: memcpy: Do not copy to same address

In some cases (e.g. bootm with a elf payload which is already at the right
position) there is a in place copy of data to the same address. Catching this
saves some ms while booting.

Signed-off-by: Matthias Weisser <weisserm@arcor.de>
---

diff --git a/arch/arm/lib/memcpy.S b/arch/arm/lib/memcpy.S
index 3b5aeec4cf..f655256b5d 100644
--- a/arch/arm/lib/memcpy.S
+++ b/arch/arm/lib/memcpy.S
@@ -60,6 +60,9 @@
 .globl memcpy
 memcpy:
 
+		cmp	r0, r1
+		moveq	pc, lr
+
 		enter	r4, lr
 
 		subs	r2, r2, #4