Method and appartus for determining a precision of an intermedia

Details Method and appartus for determining a precision of an intermedia Method and appartus for determining a precision of an intermedia

1995-09-05

1997-07-29

Elmore, Reba I.

Boots, shoes, and leggings

36471503, 36474501, G06F 738

Patent

active

056528620

ABSTRACT:
A method and apparatus for efficient allocation of temporary storage for performing accurate and correct numeric base conversions on a computer system is provided. Numeric base conversions are common because computers operate in binary whereas the values that are input into computers are based on a decimal system. A common source of error occurs when converted values are rounded. The intermediate arithmetic used to perform the conversion requires greater precision than the target floating point format. It is known that to always insure correctly rounded results, an extremely high precision intermediate arithmetic may be used. However, in many case this is a waste of system memory. To efficiently allocate system memory to this task, the most difficult rounding case is determined. The precision needed to correctly round the most difficult case is then derived. This information is then stored and subsequently used to allocate an efficient amount of storage whenever a numeric base conversion is to take place.

REFERENCES:
Coonen, Jerome, "Contributions to a Proposed Standard for Binary Floating-Point Arithmetic", Jun. 1984, pp. 1.1-D.19.
Gay, David, "Correctly Rounded Binary-Decimal and Decimal-Binary Conversions", AT&T Numerical Analysis Manuscript 90-10, Nov. 1990 pp. 1-16.
"Apple Numerics Manual, Second Edition" Apple Computer, Inc. 1988, pp. iii-xxii, 3-10, 19-34, 99-103, 155-159.

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