1 files changed, 59 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseMemoryLibSse2/X64/SetMem64.asm b/Core/MdePkg/Library/BaseMemoryLibSse2/X64/SetMem64.asm
new file mode 100644
index 0000000000..5071f6771f
--- /dev/null
+++ b/Core/MdePkg/Library/BaseMemoryLibSse2/X64/SetMem64.asm
@@ -0,0 +1,59 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+;   SetMem64.asm
+;
+; Abstract:
+;
+;   SetMem64 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .code
+
+;------------------------------------------------------------------------------
+;  VOID *
+;  InternalMemSetMem64 (
+;    IN VOID   *Buffer,
+;    IN UINTN  Count,
+;    IN UINT64 Value
+;    )
+;------------------------------------------------------------------------------
+InternalMemSetMem64 PROC
+    mov     rax, rcx                    ; rax <- Buffer
+    xchg    rcx, rdx                    ; rcx <- Count & rdx <- Buffer
+    test    dl, 8
+    movd    xmm0, r8
+    jz      @F
+    mov     [rdx], r8
+    add     rdx, 8
+    dec     rcx
+@@:
+    shr     rcx, 1
+    jz      @SetQwords
+    movlhps xmm0, xmm0
+@@:
+    movntdq [rdx], xmm0
+    lea     rdx, [rdx + 16]
+    loop    @B
+    mfence
+@SetQwords:
+    jnc     @F
+    mov     [rdx], r8
+@@:
+    ret
+InternalMemSetMem64 ENDP
+
+    END