Based on a lot of experiment results, a conclusion is drawn: comparing with other factors, the performance of branch handling strategy is the key limits of processor to exploit the instruction level parallelism existed in nonscientific code, cache miss have severe effect on superscalar processor's performance when it runs scientific code. Second, in order to reduce the branch penalty and improve the performance of superscalar processor, a new branch handling strategy—a classification based hierarchical branch handling strategy, CHBHS is proposed. It first expands the traditional processor architecture to support multiple condition code, conditional execution and Mbranch instruction, as a result, compiler can reduce the number of static conditional branch when the code is generated. Then, CHBHS tries to use the best suitable mechanism to deal with different branch base on their different behavior. CHBHS can predict the target address of unconditional branch, subroutine call and conditional branch by buffering their target address in branch target buffer, a newly proposed high efficient return address stack is used to reduce the penalty of subroutine return instruction, a new Counter Register Stack is also proposed to reduce the penalty of loop-closing branch to zero, and dynamic branch predictor is incorporate with branch target buffer to predict the outcome of conditional branch.

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The first to tertiary ramification of portal vein and their significance. The first order branch of portal vein had four patterns: namely, normal branching pattern, 90 cases (90%); trifurcation, 5 cases (5%); independent branching of right posterior branch from main portal vein, 4 cases (4%); and complicated branching pattern, 1 case (1%).

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branch out around the hilum：圍繞種臍分枝

branch order 分支指令 | branch out around the hilum 圍繞種臍分枝 | branch piece 分支

branch operator matrix：分支算子矩陣

branch office report | 支店報告, 分支機構報告 | branch operator matrix | 分支算子矩陣brief- | branch order | 分支指令, 轉移指令, 分叉指令

order of branch point：支點的階數

order of approximation 逼近的階 | order of branch point 支點的階數 | order of contact 接觸度