Resources Contact Us Home
Fetching all or portion of instructions in memory line up to branch instruction based on branch prediction and size indicator stored in branch target buffer indexed by fetch address

Image Number 6 for United States Patent #8171260.

The invention provides a method and apparatus for branch prediction in a processor. A fetch-block branch target buffer is used in an early stage of pipeline processing before the instruction is decoded, which stores information about a control transfer instruction for a "block" of instruction memory. The block of instruction memory is represented by a block entry in the fetch-block branch target buffer. The block entry represents one recorded control-transfer instruction (such as a branch instruction) and a set of sequentially preceding instructions, up to a fixed maximum length N. Indexing into the fetch-block branch target buffer yields an answer whether the block entry represents memory that contains a previously executed a control-transfer instruction, a length value representing the amount of memory that contains the instructions represented by the block, and an indicator for the type of control-transfer instruction that terminates the block, its target and outcome. Both the decode and execution pipelines include correction capabilities for modifying the block branch target buffer dependent on the results of the instruction decode and execution and can include a mechanism to correct malformed instructions.

  Recently Added Patents
Regenerative power storage system mounted on DC electric railway car
Selenium/group 3A ink and methods of making and using same
Method for execution upon processing of at least one histological sample
Nanowire structured photodiode with a surrounding epitaxially grown P or N layer
Content reproduction apparatus and content processing method therefor
System and method for associating financial transaction data with user's project data
Image forming apparatus with an improved density adjustment unit
  Randomly Featured Patents
Apparatus for electro-optical device connection
Magnetorheological fluid compositions and prosthetic knees utilizing same
Vehicle load floor
Wireless networks for vehicles
Process for the preparation of 1-monoalkyl-dimethylsilylpropyne polymers
Industrial truck
Dye-forming coupler, silver halide photographic light-sensitive material and azomethine dye compound
Flashlight head with isolated lighting elements
Sewing machine
Nectarine tree named `Sweet Surprise`