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/* Copyright 2002 Andi Kleen */

/*

 * memcpy - Copy a memory block.

 *

 * Input:

 * rdi destination

 * rsi source

 * rdx count

 *

 * Output:

 * rax original destination

 */

        .globl __memcpy

        .globl memcpy

        .p2align 4

__memcpy:

memcpy:

        pushq %rbx

        movq %rdi,%rax

        movl %edx,%ecx

        shrl $6,%ecx

        jz .Lhandle_tail

        .p2align 4

.Lloop_64:

        decl %ecx

        movq (%rsi),%r11

        movq 8(%rsi),%r8

        movq %r11,(%rdi)

        movq %r8,1*8(%rdi)

        movq 2*8(%rsi),%r9

        movq 3*8(%rsi),%r10

        movq %r9,2*8(%rdi)

        movq %r10,3*8(%rdi)

        movq 4*8(%rsi),%r11

        movq 5*8(%rsi),%r8

        movq %r11,4*8(%rdi)

        movq %r8,5*8(%rdi)

        movq 6*8(%rsi),%r9

        movq 7*8(%rsi),%r10

        movq %r9,6*8(%rdi)

        movq %r10,7*8(%rdi)

        leaq 64(%rsi),%rsi

        leaq 64(%rdi),%rdi

        jnz  .Lloop_64

.Lhandle_tail:

        movl %edx,%ecx

        andl $63,%ecx

        shrl $3,%ecx

        jz   .Lhandle_7

        .p2align 4

.Lloop_8:

        decl %ecx

        movq (%rsi),%r8

        movq %r8,(%rdi)

        leaq 8(%rdi),%rdi

        leaq 8(%rsi),%rsi

        jnz  .Lloop_8

.Lhandle_7:

        movl %edx,%ecx

        andl $7,%ecx

        jz .Lende

        .p2align 4

.Lloop_1:

        movb (%rsi),%r8b

        movb %r8b,(%rdi)

        incq %rdi

        incq %rsi

        decl %ecx

        jnz .Lloop_1

.Lende:

        popq %rbx

        ret