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Floating Point Bug on Intel Pentium CPUs [message #3170] Wed, 23 November 1994 09:08
Liam Gumley is currently offline  Liam Gumley
Messages: 473
Registered: November 1994
Senior Member
This is not strictly IDL related, but may affect IDL users on Pentium
platforms who run complicated models. Recent discussion in the
comp.sys.intel newsgroup has focussed on the discovery of a bug
in the floating point unit on Intel Pentium CPUs. The bug is evident
during divide operations. The following code reportedly will show the
bug. It should give zero (or near enough to it), but on the Pentium
it returns z = 256.

x = 4195835.
y = 3145727.
z = x - (x/y)*y

Apparently some kind of chip replacement strategy is being considered
by Intel. For more details, tune to comp.sys.intel

Cheers,
Liam.
liamg@ssec.wisc.edu

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