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/* Optimized memcpy for x86-64
Copyright (C) 2013-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "asm-syntax.h"
#if defined SHARED && IS_IN (libc)
# if !defined USE_AS_MEMPCPY && !defined USE_MULTIARCH
# define memcpy __memcpy
# undef libc_hidden_builtin_def
# define libc_hidden_builtin_def(name) \
.globl __GI_memcpy; __GI_memcpy = __memcpy
# endif
ENTRY_CHK (__memcpy_chk)
cmpq %rdx, %rcx
jb HIDDEN_JUMPTARGET (__chk_fail)
END_CHK (__memcpy_chk)
#endif
ENTRY(memcpy)
movq %rsi, %rax
#ifdef USE_AS_MEMPCPY
leaq (%rdi,%rdx), %r11
#endif
leaq (%rdx,%rdx), %rcx
subq %rdi, %rax
subq %rdx, %rax
cmpq %rcx, %rax
jb L(overlapping)
cmpq $16, %rdx
jbe L(less_16)
movdqu (%rsi), %xmm8
cmpq $32, %rdx
movdqu %xmm8, (%rdi)
movdqu -16(%rsi,%rdx), %xmm8
movdqu %xmm8, -16(%rdi,%rdx)
ja .L31
L(return):
#ifdef USE_AS_MEMPCPY
movq %r11, %rax
#else
movq %rdi, %rax
#endif
ret
.p2align 4,,10
.p2align 4
.L31:
movdqu 16(%rsi), %xmm8
cmpq $64, %rdx
movdqu %xmm8, 16(%rdi)
movdqu -32(%rsi,%rdx), %xmm8
movdqu %xmm8, -32(%rdi,%rdx)
jbe L(return)
movdqu 32(%rsi), %xmm8
cmpq $128, %rdx
movdqu %xmm8, 32(%rdi)
movdqu -48(%rsi,%rdx), %xmm8
movdqu %xmm8, -48(%rdi,%rdx)
movdqu 48(%rsi), %xmm8
movdqu %xmm8, 48(%rdi)
movdqu -64(%rsi,%rdx), %xmm8
movdqu %xmm8, -64(%rdi,%rdx)
jbe L(return)
leaq 64(%rdi), %rcx
addq %rdi, %rdx
andq $-64, %rdx
andq $-64, %rcx
movq %rcx, %rax
subq %rdi, %rax
addq %rax, %rsi
cmpq %rdx, %rcx
je L(return)
movq %rsi, %r10
subq %rcx, %r10
leaq 16(%r10), %r9
leaq 32(%r10), %r8
leaq 48(%r10), %rax
.p2align 4,,10
.p2align 4
L(loop):
movdqu (%rcx,%r10), %xmm8
movdqa %xmm8, (%rcx)
movdqu (%rcx,%r9), %xmm8
movdqa %xmm8, 16(%rcx)
movdqu (%rcx,%r8), %xmm8
movdqa %xmm8, 32(%rcx)
movdqu (%rcx,%rax), %xmm8
movdqa %xmm8, 48(%rcx)
addq $64, %rcx
cmpq %rcx, %rdx
jne L(loop)
jmp L(return)
L(overlapping):
cmpq %rsi, %rdi
jae .L3
testq %rdx, %rdx
.p2align 4,,5
je L(return)
movq %rdx, %r9
leaq 16(%rsi), %rcx
leaq 16(%rdi), %r8
shrq $4, %r9
movq %r9, %rax
salq $4, %rax
cmpq %rcx, %rdi
setae %cl
cmpq %r8, %rsi
setae %r8b
orl %r8d, %ecx
cmpq $15, %rdx
seta %r8b
testb %r8b, %cl
je .L16
testq %rax, %rax
je .L16
xorl %ecx, %ecx
xorl %r8d, %r8d
.L7:
movdqu (%rsi,%rcx), %xmm8
addq $1, %r8
movdqu %xmm8, (%rdi,%rcx)
addq $16, %rcx
cmpq %r8, %r9
ja .L7
cmpq %rax, %rdx
je L(return)
.L21:
movzbl (%rsi,%rax), %ecx
movb %cl, (%rdi,%rax)
addq $1, %rax
cmpq %rax, %rdx
ja .L21
jmp L(return)
L(less_16):
testb $24, %dl
jne L(between_9_16)
testb $4, %dl
.p2align 4,,5
jne L(between_5_8)
testq %rdx, %rdx
.p2align 4,,2
je L(return)
movzbl (%rsi), %eax
testb $2, %dl
movb %al, (%rdi)
je L(return)
movzwl -2(%rsi,%rdx), %eax
movw %ax, -2(%rdi,%rdx)
jmp L(return)
.L3:
leaq -1(%rdx), %rax
.p2align 4,,10
.p2align 4
.L11:
movzbl (%rsi,%rax), %edx
movb %dl, (%rdi,%rax)
subq $1, %rax
jmp .L11
L(between_9_16):
movq (%rsi), %rax
movq %rax, (%rdi)
movq -8(%rsi,%rdx), %rax
movq %rax, -8(%rdi,%rdx)
jmp L(return)
.L16:
xorl %eax, %eax
jmp .L21
L(between_5_8):
movl (%rsi), %eax
movl %eax, (%rdi)
movl -4(%rsi,%rdx), %eax
movl %eax, -4(%rdi,%rdx)
jmp L(return)
END(memcpy)
#ifndef USE_AS_MEMPCPY
libc_hidden_builtin_def (memcpy)
# if defined SHARED && !defined USE_MULTIARCH && IS_IN (libc)
# undef memcpy
# include <shlib-compat.h>
versioned_symbol (libc, __memcpy, memcpy, GLIBC_2_14);
# endif
#endif
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