[fpc-pascal] IFDEF usage in x86_64's SwapEndian() implementation

[Michael Van Canneyt]

On Wed, 30 Mar 2016, Graeme Geldenhuys wrote:

> Hi,
>
> Here is the x86_64's SwapEndian() function implementation.
>
> =============[ src/rtl/x86_64/x86_64.inc ]====================
> function SwapEndian(const AValue: DWord): DWord; assembler; nostackframe;
> asm
> {$ifdef win64}
>  movl %ecx, %eax
> {$else win64}
>  movl %edi, %eax
> {$endif win64}
>  bswap %eax
> end;
> =============================================
>
> Surely the usage of IFDEF WIN64 is not 100% correct or accurate. Should
> the above not rather read IFDEF CPU64?

No, the code is exclusively for all 64-bit platforms.

The code is there to differentiate between the windows ABI and other ABIS,
which specify in what register the AValue parameter is passed.

Michael.