Diab PPC Assy. macro question

I'm trying to swap an 8 byte quantity via a Diab macro but I am unable to
figure out how to get access to the second word of the unsigned long long.
Here's what I have: 

asm uint64 swap8Bytes(uint64 eightBytes)
{
%   reg eightBytes; 
!   "r0", "r12"     

    mr      r12,eightBytes /* LSW */
    rlwinm  r0,r12, 8, 8,31
    rlwimi  r0,r12,24,16,23
    rlwimi  r0,r12,24, 0, 8
    mr      r4,r0

    mr      r12,eightBytes /* MSW? How? */
    rlwinm  r0,r12, 8, 8,31
    rlwimi  r0,r12,24,16,23
    rlwimi  r0,r12,24, 0, 8
    mr      r3,r0
}


-- 
- Mark ->
--

In article <Xns9598A478555FACopyrightMarkOdell@130.133.1.4>, 
odellmark@hotmail.com says...
> I'm trying to swap an 8 byte quantity via a Diab macro but I am unable to
> figure out how to get access to the second word of the unsigned long long.
> Here's what I have: 
> 
> asm uint64 swap8Bytes(uint64 eightBytes)
> {
> %   reg eightBytes; 
> !   "r0", "r12"     
> 
>     mr      r12,eightBytes /* LSW */
>     rlwinm  r0,r12, 8, 8,31
>     rlwimi  r0,r12,24,16,23
>     rlwimi  r0,r12,24, 0, 8
>     mr      r4,r0
> 
>     mr      r12,eightBytes /* MSW? How? */
>     rlwinm  r0,r12, 8, 8,31
>     rlwimi  r0,r12,24,16,23
>     rlwimi  r0,r12,24, 0, 8
>     mr      r3,r0
> }

Have you considered writing this in C, then looking at the assembly
output Diab creates for a hint?

--Gene

Gene S. Berkowitz <first.last@comcast.net> wrote in
news:MPG.1bf61d6da1631fc4989755@news.comcast.giganews.com: 

>> I'm trying to swap an 8 byte quantity via a Diab macro but I am unable
>> to figure out how to get access to the second word of the unsigned long
>> long. Here's what I have: 
[snip] 
> Have you considered writing this in C, then looking at the assembly
> output Diab creates for a hint?

Uh, yes and it is atrocious code. The compiler doesn't recognized the
idiom of a 64-bit integer swap. Thus, we PowerPC developers tend to use
this handy sequence of rlwiXX instruction for swapping bytes in a word.
What I am trying to discern is the Diab assembler mnemonic that allows the
human assembler writer to specify the MS word and LS word in a 64-bit
integer. The Diab manuals do not specify how to do this. 

Thanks.

-- 
- Mark ->
--