March 2000
Intermediate to advanced
576 pages
18h 13m
English
Content preview from Delphi in a Nutshell
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Name
TestFDIV Variable
Syntax
var TestFDIV: ShortInt;
Description
The TestFDIV
variable tells whether the
floating-point processor has a correct implementation of the FDIV
instruction.
If you use the $U or
$SafeDivide compiler directive, all floating-point
division operations call a function that tests the floating-point
processor for the infamous Pentium FDIV bug. If the bug is present,
future divisions will be performed by a software subroutine that
gives the correct answer. If the bug is not present, future divisions
will be performed by the floating-point hardware.
The TestFDIV variable contains one of the
following values:
- -1
The processor is flawed and will be bypassed.
- 0
The processor has not yet been tested.
- 1
The processor has been tested and is correct.
Tips and Tricks
TestFDIV exists for backward compatibility only.
Windows handles this problem in the operating
system.
See Also
| $SafeDivide Compiler Directive, $U Compiler Directive |
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