Elbrus International Limited

Elbrush International Limited

Alexey P Lizorkin

Yuli Kh Sakhin

Boris A Babaian

Feodor A Gruzdov

Leonid N Nazarov

Vladimir V Rudometov

Alexander M Artyomov

Alexander M Artymov

Evgeny Z Stolyarsky

A method and system for preparing branch instruction of a computer program, for compiling and execution in a computer system, in which each transfer instruction is split into two instructions: a control transfer preparation instruction and a control transfer instruction, wherein the control transfer preparation instruction contains the transfer address and is placed by the compiler several instructions ahead of the control transfer instruction, so that the number of clock cycles in the pipeline between transfer condition generation and transfer itself would be reduced.

Branch preparation

An unpacking circuit and operating method in a very long instruction word (VLIW) processor provides for parallel handling of a packed wide instruction in which a packed wide instruction is divided into groups of syllables. An unpacked instruction representation includes a plurality of syllables, which generally correspond to operations for execution by an execution unit. The syllables in the unpacked instruction representation are assigned to groups. The packed instruction word includes a sequence of syllables and a header. The header includes a descriptor for each group. The descriptor includes a mask and may include a displacement designator. The multiple groups are handled in parallel as the displacement designator identifies a starting syllable. The mask designates the syllables which are transferred from the packed instruction to the unpacked representation and identifies the position of NOPs in the unpacked representation.

Method and apparatus for packing and unpacking wide instruction word

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Moscow, Russia

Alexey P Lizorkin