[fpc-devel] Extended in Win64
daniel.mantione at freepascal.org
Tue May 6 15:51:16 CEST 2008
Op Tue, 6 May 2008, schreef Jonas Maebe:
> On 06 May 2008, at 15:02, petr.kristan at epos.cz 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
Actually this is a myth, originating from Microsoft itself. Win64 has
always supported the x87, but early Microsoft documentation said
it did not. This confused Microsofts' MASM coders which disabled the x87
instructions in MASM.
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