remove unnecessary check for NULL pointer.

[mirror_edk2.git] / OldMdePkg / Library / BaseMemoryLibSse2 / x64 / SetMem64.asm

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