发明申请
US20080276071A1 REDUCING THE FETCH TIME OF TARGET INSTRUCTIONS OF A PREDICTED TAKEN BRANCH INSTRUCTION 审中-公开
减少预期的分支指导目标指示的时间

REDUCING THE FETCH TIME OF TARGET INSTRUCTIONS OF A PREDICTED TAKEN BRANCH INSTRUCTION
摘要:
A method and processor for reducing the fetch time of target instructions of a predicted taken branch instruction. Each entry in a buffer, referred to herein as a “branch target buffer”, may store an address of a branch instruction predicted taken and the instructions beginning at the target address of the branch instruction predicted taken. When an instruction is fetched from the instruction cache, a particular entry in the branch target buffer is indexed using particular bits of the fetched instruction. The address of the branch instruction in the indexed entry is compared with the address of the instruction fetched from the instruction cache. If there is a match, then the instructions beginning at the target address of that branch instruction are dispatched directly behind the branch instruction. In this manner, the fetch time of target instructions of a predicted taken branch instruction is reduced.
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