newlib on x86-64

[Jeff Johnston]

Patch checked in.  Excruciatingly long commit time for me today, not 
sure why.

-- Jeff J.

Neal H. Walfield wrote:
> Attached is a patch for memcpy.S.  memset.S and setjmp.S don't use the
> red zone.  I think that is actually all of the x86-64 assembly.  Am I
> missing something?
>
> Neal
>
> 2009-02-04  Neal H. Walfield  <neal@gnu.org>
>
> 	* libc/machine/x86_64/memcpy.S (memcpy): Don't use the red zone.
>
> diff -c newlib/libc/machine/x86_64/memcpy.S\~ newlib/libc/machine/x86_64/memcpy.S
> --- newlib/libc/machine/x86_64/memcpy.S~	2007-08-28 23:56:49.000000000 +0200
> +++ newlib/libc/machine/x86_64/memcpy.S	2009-02-04 05:07:51.000000000 +0100
> @@ -30,10 +30,10 @@
>    cmpq    $256, rdx
>    jb      quadword_copy
>  
> -  movq    rax, -8  (rsp)
> -  movq    r12, -16 (rsp)
> -  movq    r13, -24 (rsp)
> -  movq    r14, -32 (rsp)
> +  pushq    rax
> +  pushq    r12
> +  pushq    r13
> +  pushq    r14
>  
>    movq    rdx, rcx                /* Copy 128 bytes at a time with minimum cache polution */
>    shrq    $7, rcx
> @@ -89,10 +89,10 @@
>    movq    rdx, rcx
>    andq    $127, rcx
>    rep     movsb
> -  movq    -8  (rsp), rax
> -  movq    -16 (rsp), r12
> -  movq    -24 (rsp), r13
> -  movq    -32 (rsp), r14
> +  popq    r14
> +  popq    r13
> +  popq    r12
> +  popq    rax
>    ret
>  
>  
>
>