[fpc-devel] 64 Bit / 32 Bit

Michael Schnell mschnell at lumino.de
Thu Oct 4 12:16:03 CEST 2007

> It is supported but deprecated because x87 fpu simply gives compilers a
> headache.
Are there new floating point instruction in the 64 bit instruction set 
and the old instructions are still there but not necessary to access the 
floating point hardware ?

If so, why would any 64 bit compiler use the old instructions at all ?

Do you suggest that the 80 bit IEEE floating point type is not supported 
by the 64 bit instruction set (so that the old instructions are 
necessary to handle this data type) ? Why would the CPU designers omit 
this type ?


More information about the fpc-devel mailing list