查询词典 optimizing compiler

The fourth chapter of this paper describes the function of the complier and the grammer norms,at the same time it gives the way how to run this compiler.

在本文的第四章详细给出了此次设计所实现的功能和语法规范，同时也给出了编译器的运行方式。

Java compiler generates byte code as complier output.

Java编译器生成的字节码编译器输出。

This article is based on the principle of compiler. After considered the process and theories of the complier, the article realized a basic structure used in DBMS and a SQL syntax analyzer as well.

本文从编译原理入手，在研究编译过程及相关知识的基础上，研究了数据库查询语言SQL从底层数据结构到上层语法分析的实现过程。

Equals zero, but the compiler reversed the condition so that the conditional instruction in

测试SomeVariable是不是非0。产生这样情况的原因是：编译器生成的二进制代码是根

Also, we modify UNITY compiler to support guarding basic block and simulating data-process instructions with conditional move instruction.

同时，在编译器中通过使用条件移动指令模拟数据处理类指令，使得整个基本块可以被条件执行。

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.

基于上述结论，为了尽量消除转移指令对处理器开发指令级并行性能力的影响，进一步提高处理器性能，在详尽分析目前已存在的转移处理策略的特点与局限性的基础上，首次提出了一种新的转移处理策略即基于分类的层次转移处理策略CHBHS(Classification Based Hierarchical Branch Handling Strategy)，它首先通过扩展传统的体系结构，支持多条件码、条件式执行及多分支转移技术，以使编译程序在进行代码生成时可尽量少生成条件转移指令，从而减少静态条件转移指令的数目；其次，基于不同的转移指令的行为不同这一事实，提出了对不同的转移指令采用不同的机制进行处理的思想，即对无条件转移指令和函数调用指令以及条件转移指令的目标地址，采用转移目标缓冲器来预测，对于函数返回指令，采用所提出一种的高效返回地址栈来预测其目标地址，对于大多数循环控制转移指令，采用所提出的Counter Register Stack来将其所可能带来的损失减少为0，对于其他的条件转移指令采用动态预测机制来预测其方向。

While loops the compiler never has to worry about whether the loop's conditional statement is expected to be satisfied or not in the first run.

当程序中包含了一个do…while循环时，编译器会生成一个比上面的例子简单的多的代码流。

There is no requirement that the compiler lay out the base and derived parts of an object contiguously. Hence, Figure 15.1 is a conceptual, not physical, representation of how classes work.

C++ 语言不要求编译器将对象的基类部分和派生部分和派生部分连续排列，因此，图 15.1 是关于类如何工作的概念表示而不是物理表示。

For example, variable length arrays [2, 3, 4, 5] came from the Cray C compiler, and a similar feature is in GNU C.

例如，变长数组 [2， 3， 4， 5] 来自 Cray 的C编译器，以及GNU C中一个类似的特性。

CrissCross crossword compiler is an ideal tool for education.

交错纵横的编译器是一个理想的工具，教育。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。