Method and floating point unit to convert a hexadecimal...

Details Method and floating point unit to convert a hexadecimal... Method and floating point unit to convert a hexadecimal...

2006-07-20

2010-11-23

Bullock, Jr., Lewis A (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C708S501000, C708S495000, C708S673000, C712S222000, C341S050000

Reexamination Certificate

active

07840622

ABSTRACT:
Method to convert a hexadecimal floating point number (H) into a binary floating point number by using a Floating Point Unit (FPU) with fused multiply add with an A-register a B-register for two multiplicand operands and a C-register for an addend operand, wherein a leading zero counting unit (LZC) is associated to the addend C-register, wherein the difference of the leading zero result provided by the LZC and the input exponent (E) is calculated by a control unit and determines based on the Raw-Result-Exponent a force signal (F) with special conditions like ‘Exponent Overflow’, ‘Exponent Underflow’, and ‘Zero Result’.

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G. Gerwig et al. “The IBM eServer z990 Floating-Point Unit”, IBM Journal of Research and Development, vol. 48, No. 3/4, May/Jul. 2004, pp. 311-322.
IEEE Standard 754-1985 “IEEE Standard for Binary Floating-Point Arithmetic”, IEEE 1985, pp. i - 14.

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