Am 21.11.10 19:02, schrieb Vinzent Höfler:
On Sun, 21 Nov 2010 18:54:13 +0100, Helmut Hartl<helmut.ha...@firmos.at>
wrote:
Running the above program gives
1) C++ / FPC 64 Bit
6.3846106530
6.3846106530
2) FPC32 Bit
6.3846106530
6.3846111610
Is this explainable or wrong behaviour ?
First suspect candidate: the intermediate results are calculated with
the 80-bit "temporary" float of the FPU on x86-32, while this is not
the case on the 64 bit target.
Thanks for the idea - Looking a bit (one eyed) at the generated code
this seems to be the most likely reason.
I just gave up on the idea of comparing c++ / and fpc's calculations
directly.
helmut
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