Over the past few days, some of our users have encountered a known Pentium bug. This problem can occur due to many factors. Let’s discuss some of them below.
The Pentium FDIV bug is the most famous (or most infamous) Intel microprocessor bug. This was caused by a bug in the lookup table which is part of the Intel SRT algorithm which was sometimes supposed to be faster and more accurate.
Error Pentium fdiv Errorand FDIV is frankly notorious (or intel microprocessorMistake. Was it caused by an error while checking the arraydid this part because of the intel algorithm which srt was supposed to be fasterI agree.
Why was the Pentium floating-point bug such a big issue?
the one with floating point division was caused by a subtle but specific design flaw – the flaw was slightly modified by the mask change bill during the next regular production revision of the chip in 1994, 2006.
For the specific purpose of increasing the execution of floating point scalar code by 5Time and vector code at 5 distances from the 486DX chip, Inteldecided to use the SRT algorithm formula, which can generate two private pathscycles, while the traditional 486 shift and subtract algorithm wasBasically generates one private bit per cycle. This SRT algorithm uses someCalculation of the lookup table for the expected intermediate quotientfloating point division. The Intel research table consists of 1066Entrees, dinner table, five of which were not purchased due to a specific programming errorProgrammable mix logic (PLA). If one of these 10 cellsavailable to point drift unit It (fpu), (fpu) reset to zeroinstead of +2, which is usually included in “missing”.cells. Until then, this interferes with the calculation and gives a generally less accurate result.rightValid number (, March 1995).
In the worst case, this failure can occur up to the fourth level.Decimal but man’s ways to do it first in linein Billions 360. Most often, the last error occurs on 9 or10. What decimal number gives the probability of an event like this from 1 to severalbillion
Intel has classified an annoyance (or bug as they call it) withthe following similarities (Intel):
For some records, information and facts (Instructions floating point division fpdi)Excessive Pentium processor leads to incorrect results.
A specific error may occur with each of the three working precisions.extendedsingle, double, or for the corresponding division instruction. However, he keepsSignificantly fewer recurrences were found with single-precision detection atDouble extended precision or .The
from CPU independent is the real problemrounding modes.
The occurrence of the problem strongly depends on the data entered. certainThe data alone is causing the whole problem.1 in 9 billion foodsXia, without thinking about how to produce or leftoversinaccurate share results.Degree
inaccuracies depend on the personal information entered and from which are involvededucation.
The issue does not occur with the specific use of a service attemptEvaluation instruction whose input inverse operand is uniqueAccuracy.
In addition, the error affects all statements that are searched for in mine or links.FDIV call table. Related operators, by mistakeare processed FDIVP, FDIVRP, FDIVR, FIDIVR and fidiv, fprem FPREM1.FPTAN and FPATAN operators are also vulnerable. BoardFYL2X, FYL2XP1 and fsin fcos were Fsincos suspects but nowconsidered safe.3D plot of all 4195835/3145727 ratios calculated on Pentium one FDIV withMistake. Unfortunately, the triangles indicate wrong price zones.were calculated. Ideal values would be all round 1.3338, butThe return values might be 1.3337, an error in the fifth big digit.Byte magazine, March 1995 Hats off.
Intel Accepted Replacement No Questions Asked National PolicyClients with malicious Pentium FDIV software. This is t Also exactlyArrived and researched information about a new error on his website duringintel.com
