Electrical computers and digital processing systems: processing – Processing control – Branching
Reexamination Certificate
2007-01-09
2007-01-09
Fleming, Fritz (Department: 2181)
Electrical computers and digital processing systems: processing
Processing control
Branching
C712S240000
Reexamination Certificate
active
09898583
ABSTRACT:
A branch control apparatus in a microprocessor. A register receives a first cache line containing a branch instruction from an instruction cache in response to a fetch address. The fetch address hits in a BTAC that provides a target address of the branch instruction. The BTAC also provides an offset of the instruction following the branch instruction. The instructions following the branch instruction are invalidated based on the offset. Muxing logic packs only the valid instructions into a byte-wide instruction buffer that is directly coupled to instruction format logic. The instruction cache provides a second cache line containing the target instructions to the register in response to the target address. The instructions preceding the target instructions are invalidated based on the lower bits of the target address. The muxing logic packs only the valid target instructions into the instruction buffer immediately adjacent to the branch instruction bytes.
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Henry G. Glenn
McDonald Thomas C.
Davis E. Alan
Fleming Fritz
Huffman James W.
IP-First LLC
Moll Jesse
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