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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [machine/] [x86_64/] [memcpy.S] - Blame information for rev 437

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Line No. Rev Author Line
1 207 jeremybenn 
/*
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 * ====================================================
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 * Copyright (C) 2007 by Ellips BV. All rights reserved.
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 *
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 * Permission to use, copy, modify, and distribute this
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 * software is freely granted, provided that this notice
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 * is preserved.
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 * ====================================================
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 */
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  #include "x86_64mach.h"
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  .global SYM (memcpy)
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  SOTYPE_FUNCTION(memcpy)
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SYM (memcpy):
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  movq    rdi, rax                /* Store destination in return value */
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  cmpq    $16, rdx
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  jb      byte_copy
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  movq    rdi, r8                 /* Align destination on quad word boundary */
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  andq    $7, r8
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  jz      quadword_aligned
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  movq    $8, rcx
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  subq    r8, rcx
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  subq    rcx, rdx
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  rep     movsb
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quadword_aligned:
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  cmpq    $256, rdx
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  jb      quadword_copy
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  pushq    rax
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  pushq    r12
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  pushq    r13
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  pushq    r14
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  movq    rdx, rcx                /* Copy 128 bytes at a time with minimum cache polution */
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  shrq    $7, rcx
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  .p2align 4
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loop:
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  prefetchnta   768 (rsi)
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  prefetchnta   832 (rsi)
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  movq       (rsi), rax
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  movq     8 (rsi), r8
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  movq    16 (rsi), r9
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  movq    24 (rsi), r10
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  movq    32 (rsi), r11
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  movq    40 (rsi), r12
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  movq    48 (rsi), r13
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  movq    56 (rsi), r14
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  movntiq rax,    (rdi)
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  movntiq r8 ,  8 (rdi)
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  movntiq r9 , 16 (rdi)
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  movntiq r10, 24 (rdi)
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  movntiq r11, 32 (rdi)
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  movntiq r12, 40 (rdi)
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  movntiq r13, 48 (rdi)
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  movntiq r14, 56 (rdi)
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  movq     64 (rsi), rax
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  movq     72 (rsi), r8
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  movq     80 (rsi), r9
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  movq     88 (rsi), r10
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  movq     96 (rsi), r11
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  movq    104 (rsi), r12
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  movq    112 (rsi), r13
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  movq    120 (rsi), r14
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  movntiq rax,  64 (rdi)
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  movntiq r8 ,  72 (rdi)
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  movntiq r9 ,  80 (rdi)
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  movntiq r10,  88 (rdi)
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  movntiq r11,  96 (rdi)
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  movntiq r12, 104 (rdi)
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  movntiq r13, 112 (rdi)
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  movntiq r14, 120 (rdi)
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  leaq    128 (rsi), rsi
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  leaq    128 (rdi), rdi
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  dec     rcx
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  jnz     loop
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  sfence
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  movq    rdx, rcx
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  andq    $127, rcx
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  rep     movsb
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  popq    r14
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  popq    r13
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  popq    r12
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  popq    rax
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  ret
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byte_copy:
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  movq    rdx, rcx
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  rep     movsb
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  ret
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quadword_copy:
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  movq    rdx, rcx
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  shrq    $3, rcx
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  .p2align 4
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  rep     movsq
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  movq    rdx, rcx
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  andq    $7, rcx
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  rep     movsb                   /* Copy the remaining bytes */
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  ret

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