Delphi Invalid Floating Point Error
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Invalid Floating Point Operation Delphi
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Floating Point Overflow Delphi
just like you, helping each other. Join them; it only takes a minute: Sign up Invalid floating point operation calling Trunc() up vote 15 down vote favorite 4 I'm getting a (repeatable) floating point exception when i try to Trunc() a Real value. e.g.: Trunc(1470724508.0318); In reality the actual code is more complex: ns: Real;
Invalid Floating Point Operation Synchro
v: Int64; ns := ((HighPerformanceTickCount*1.0)/g_HighResolutionTimerFrequency) * 1000000000; v := Trunc(ns); But in the end it still boils down to: Trunc(ARealValue); Now, i cannot repeat it anywhere else - just at this one spot. Where it fails every time. It's not voodoo Fortunately computers are not magic. The Intel CPU performs very specific observable actions. So i should be able to figure out why the floating point operation fails. Going into the CPU window v := Trunc(ns) fld qword ptr [ebp-$10] This loads the 8-byte floating point value at ebp-$10 into floating point register ST0. The bytes at memory address [ebp-$10] are: 0018E9D0: 6702098C 41D5EA5E (as DWords) 0018E9D0: 41D5EA5E6702098C (as QWords) 0018E9D0: 1470724508.0318 (as Doubles) The call succeeds, and the floating point register the contains the appropriate value: Next is the actual call to the RTL Trunc function: call @TRUNC Next is the guts of Delphi RTL's Trunc function: @TRUNC: sub esp,$0c wait fstcw word ptr [esp] //Store Floating-Point Control Word on the stack wait fld
appropriately rounded when necessary and with checks for divide by zero errors, that intermittently gives the error 'Invalid floating point operation'. when the equation is run with exactly the same variables, it can invalid floating point operation fix software error the first time run, or the 8th time, or 8 times in a
Invalid Floating Point Constant Matlab
row, seemingly at random. any thoughts? John Herbster (TeamB) Delphi Developer 2003-07-03 06:09:30 AM Re:Invalid floating point operation invalid floating point operation sql "Dave Tittle"
fatal error - Invalid Floating Point operation. The procedure which is causing the error has no real calculations, no real variables defined and use no http://www.delphigroups.info/2/f1/79165.html real variables. Any ideas? TIA Vladimir Konono Delphi Developer Mon, 06 Oct 2003 23:24:45 GMT Re:What can cause an invalid floating point operation? Quote> My application is causing a fatal error - Invalid Floating Point operation. > The procedure which is causing the error has no real calculations, no real > variables defined and use no real variables. > Any ideas? Source floating point text in studio !!! Vladimir Kononov Bob Richardso Delphi Developer Tue, 07 Oct 2003 01:22:00 GMT Re:What can cause an invalid floating point operation? Quote"NoSpam"