[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibMmx / X64 / CopyMem.S

#\r
# ConvertAsm.py: Automatically generated from CopyMem.asm\r
#\r
#------------------------------------------------------------------------------\r
#\r
# Copyright (c) 2006 - 2008, 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
#   CopyMem.S\r
#\r
# Abstract:\r
#\r
#   CopyMem function\r
#\r
# Notes:\r
#\r
#------------------------------------------------------------------------------\r
\r
\r
#------------------------------------------------------------------------------\r
#  VOID *\r
#  EFIAPI\r
#  InternalMemCopyMem (\r
#    IN VOID   *Destination,\r
#    IN VOID   *Source,\r
#    IN UINTN  Count\r
#    )\r
#------------------------------------------------------------------------------\r
.intel_syntax noprefix\r
.globl ASM_PFX(InternalMemCopyMem)\r
ASM_PFX(InternalMemCopyMem):\r
    push    rsi\r
    push    rdi\r
    mov     rsi, rdx                    # rsi <- Source\r
    mov     rdi, rcx                    # rdi <- Destination\r
    lea     r9, [rsi + r8 - 1]          # r9 <- End of Source\r
    cmp     rsi, rdi\r
    mov     rax, rdi                    # rax <- Destination as return value\r
    jae     L0\r
    cmp     r9, rdi\r
    jae     L_CopyBackward              # Copy backward if overlapped\r
L0:\r
    mov     rcx, r8\r
    and     r8, 7\r
    shr     rcx, 3                      # rcx <- # of Qwords to copy\r
    jz      L_CopyBytes\r
    movd    r10, mm0                    # (Save mm0 in r10)\r
L1:\r
    movq    mm0, [rsi]\r
    movntq  [rdi], mm0\r
    add     rsi, 8\r
    add     rdi, 8\r
    loop    L1\r
    mfence\r
    movd    mm0, r10                    # (Restore mm0)\r
    jmp     L_CopyBytes\r
L_CopyBackward:\r
    mov     rsi, r9                     # rsi <- End of Source\r
    lea     rdi, [rdi + r8 - 1]         # rdi <- End of Destination\r
    std                                 # set direction flag\r
L_CopyBytes:\r
    mov     rcx, r8\r
    rep     movsb                       # Copy bytes backward\r
    cld\r
    pop     rdi\r
    pop     rsi\r
    ret\r
Commit	Line	Data
b1ff428c	1	#\r
	2	# ConvertAsm.py: Automatically generated from CopyMem.asm\r
	3	#\r
	4	#------------------------------------------------------------------------------\r
	5	#\r
373ade0e	6	# Copyright (c) 2006 - 2008, Intel Corporation\r
b1ff428c	7	# All rights reserved. This program and the accompanying materials\r
	8	# are licensed and made available under the terms and conditions of the BSD License\r
	9	# which accompanies this distribution. The full text of the license may be found at\r
	10	# http://opensource.org/licenses/bsd-license.php\r
	11	#\r
	12	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	13	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	14	#\r
	15	# Module Name:\r
	16	#\r
	17	# CopyMem.S\r
	18	#\r
	19	# Abstract:\r
	20	#\r
	21	# CopyMem function\r
	22	#\r
	23	# Notes:\r
	24	#\r
	25	#------------------------------------------------------------------------------\r
	26	\r
	27	\r
	28	#------------------------------------------------------------------------------\r
	29	# VOID *\r
	30	# EFIAPI\r
	31	# InternalMemCopyMem (\r
	32	# IN VOID *Destination,\r
	33	# IN VOID *Source,\r
	34	# IN UINTN Count\r
	35	# )\r
	36	#------------------------------------------------------------------------------\r
	37	.intel_syntax noprefix\r
	38	.globl ASM_PFX(InternalMemCopyMem)\r
	39	ASM_PFX(InternalMemCopyMem):\r
	40	push rsi\r
	41	push rdi\r
	42	mov rsi, rdx # rsi <- Source\r
	43	mov rdi, rcx # rdi <- Destination\r
	44	lea r9, [rsi + r8 - 1] # r9 <- End of Source\r
	45	cmp rsi, rdi\r
	46	mov rax, rdi # rax <- Destination as return value\r
	47	jae L0\r
	48	cmp r9, rdi\r
	49	jae L_CopyBackward # Copy backward if overlapped\r
	50	L0:\r
	51	mov rcx, r8\r
	52	and r8, 7\r
	53	shr rcx, 3 # rcx <- # of Qwords to copy\r
	54	jz L_CopyBytes\r
	55	movd r10, mm0 # (Save mm0 in r10)\r
	56	L1:\r
	57	movq mm0, [rsi]\r
	58	movntq [rdi], mm0\r
	59	add rsi, 8\r
	60	add rdi, 8\r
	61	loop L1\r
	62	mfence\r
	63	movd mm0, r10 # (Restore mm0)\r
	64	jmp L_CopyBytes\r
	65	L_CopyBackward:\r
	66	mov rsi, r9 # rsi <- End of Source\r
	67	lea rdi, [rdi + r8 - 1] # rdi <- End of Destination\r
	68	std # set direction flag\r
	69	L_CopyBytes:\r
	70	mov rcx, r8\r
71	rep movsb # Copy bytes backward\r
72	cld\r
73	pop rdi\r
74	pop rsi\r
75	ret\r