PIII and Mac/x86


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Augustine
Volunteer tester

Joined: Sep 13 06
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Message 997 - Posted 17 Oct 2006 16:18:15 UTC

I wonder if the differences you observe are due to the fact that Win/x86 and Linux/x86 use x87 for floating-point calculations, whereas Mac/x86, like Linux/x86-64, uses SSE.

When using x87, intermediary calculations are done with 80-bit precision, but using SSE limits them to 32 or 64-bit precision.

When using SSE, the behavior is that as defined by IEEE-754 and matches that one gets when using other UNIX platforms, such as Solaris/SPARC or HP-UX/PA, and also Mac/PPC.

Such differences were known and dealt with in the early days of SETI@home before BOINC, when practically every platform on Earth was supported.

HTH



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Message boards : Docking@Home Science : PIII and Mac/x86

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