Boots – shoes – and leggings
Patent
1993-03-01
1994-08-23
Baker, Stephen M.
Boots, shoes, and leggings
364745, 3647365, 36471501, G06F 738
Patent
active
053413202
ABSTRACT:
A method for processing exception conditions in a floating-point system (40) begins by determining in hardware that an exception will occur (14) for a given floating-point operation and operand(s). After the hardware determines that an exception is to occur, an exception handler is invoked from software. The exception handler numerically alters the operands to create biased operands which may be processed by the hardware (20) via the given floating-point operation without creating another exception condition. The biased operands are then processed by the hardware via the given floating-point operation to produce a biased floating-point result. The biased floating-point result is unbiased (22) by the exception handler to achieve an unbiased result. The speed of floating-point exception handling is improved by using biasing techniques and both software and hardware to mathematically resolve floating-point exceptions to correct unbiased results.
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"VAX Floating Point: A Solid Foundation for Numerical Computation", by Payne et al., Electro/80 Conference Record, May 13-15 1980, pp. 18-1/1-12
"Compatible Software and Hardware Implementations Permitted by IEEE Standards for Binary Floating-point Arithmetic", AFIPS Conf. Proc., '84 Nat. Comp. Conf., pp. 101, 103-105.
"Architecture of the NS32580 Floating-point Controller", by Ben-Chorin, 1988 IEEE Compcon National Conference, pp. 213-217.
"High-performance Floating-point Coprocessor for the NS32532 CPU", by lacobovici, Wescon 1988 Convention, pp. 1-6.
"Specifications for a Variable-Precision Arithmetic Coprocessor", by Hull et al., 10th IEEE Symp. on Computer Arithmetic 1991, pp. 127-131.
"Trap Architectures for LISP Systems", Johnson, Proc. of the 1990 ACM Conference on LISP and Functional Programming, pp. 79-86.
Dorris Roderick L.
Trissel David W.
Werbner Stuart A.
Baker Stephen M.
Moise Emmanuel
Motorola Inc.
Witek Keith E.
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