128-bit register file and 128-bit floating point load and store

Details 128-bit register file and 128-bit floating point load and store 128-bit register file and 128-bit floating point load and store

1995-12-20

1998-04-14

Malzahn, David H.

Boots, shoes, and leggings

36474816, G06F 738

Patent

active

057400938

ABSTRACT:
A technique for providing adaptive 128-bit load and store operations to support architecture extensions for computations on a 128-bit quadruple precision format, in which a single set of load and store instructions provides for save and restore operations on both 80-bit and 128-bit floating point register files. A 128-bit load and store instructions are utilized for moving values that are 128-bit aligned in memory. The transfer entails the movement of data between a 128-bit memory boundary and a floating point register file for register save and restore operations. In one embodiment, 80-bit registers are used and in a second embodiment 128-bit registers are used. The same instructions operate on both the 80-bit and 128-bit registers to map the content of a given register into a 128-bit boundary field in memory. A load/store unit allocates the bit positioning so that when 80-bit registers are used, the 80 bits are moved into the most significant bit positions of the 128-bit boundary field. The remaining bit positions are filled with 0's. When values are moved to memory the reverse operation is performed.

REFERENCES:
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patent: 5523961 (1996-06-01), Naini
patent: 5631859 (1997-05-01), Markstein et al.
IEEE Standard for Binary Floating-Point Arithmetic (ANSI/IEEE Std 754-1985).
IEEE Standard for Radix-Independent Floating-Point Arithmetic (ANSI/IEEE Std 854-1987).
MC88110 Second Generation RISC Microprocessor User's Manual; Motorola Inc., 1991.

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