From: mdkinney <mdkinney@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Sat, 6 Oct 2007 21:59:01 +0000 (+0000)
Subject: Restore original algorithm and add comments
X-Git-Tag: edk2-stable201903~21992
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=9b7c438b983edfb0b9682b361f3c3f1967357b78;p=mirror_edk2.git

Restore original algorithm and add comments


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4033 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/MdePkg/Library/BaseMemoryLibRepStr/x64/SetMem.asm b/MdePkg/Library/BaseMemoryLibRepStr/x64/SetMem.asm
index 2c9b211516..fe1bc70f6b 100644
--- a/MdePkg/Library/BaseMemoryLibRepStr/x64/SetMem.asm
+++ b/MdePkg/Library/BaseMemoryLibRepStr/x64/SetMem.asm
@@ -33,12 +33,11 @@
 ;    )
 ;------------------------------------------------------------------------------
 InternalMemSetMem   PROC    USES    rdi
-    push    rcx        ; push Buffer
     mov     rax, r8    ; rax = Value
     mov     rdi, rcx   ; rdi = Buffer
-    mov     rcx, rdx   ; rcx = Count
+    xchg    rcx, rdx   ; rcx = Count, rdx = Buffer
     rep     stosb
-    pop     rax        ; rax = Buffer
+    mov     rax, rdx   ; rax = Buffer
     ret
 InternalMemSetMem   ENDP