On 06 May 2008, at 15:02, [EMAIL PROTECTED] wrote:
Why on Win64 on AMD64 is Extended type 64bit same as double and on
Win32, Linux32 and
Linux64 is 80bit.
Because the original win64 releases did not support the use of the
80x87 floating point unit, and it's still considered to be deprecated.
The SSE/SSE2/SSE3/SSE4 units do not support the 80 bit floating point
type.
It breaks for example this construction:
procedure Swap(var X, Y: Double); overload;
procedure Swap(var X, Y: Extended); overload;
This construction also doesn't work on all non-x86 platforms. The
proper way is to use the following macros to conditionalise your code:
FPC_HAS_TYPE_SINGLE
FPC_HAS_TYPE_DOUBLE
FPC_HAS_TYPE_EXTENDED
Jonas
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