生成最快的可执行文件 [英] Producing the fastest possible executable

问题描述

我有一个非常大的程序，我一直在视觉工作室（v6然后迁移到2008年）。我需要可执行文件尽可能快地运行。该程序大部分时间处理各种大小的整数，并且只有很少的IO。

显然我会选择最大优化，但似乎有各种各样的东西可以做的，不进行优化的标题下，仍然影响可执行的速度。例如，选择__fastcall调用约定或设置结构成员对齐到一个大数。

所以我的问题是：是否有其他编译器/链接器选项，我应该使用程序更快，而不是从属性对话框的优化页面控制。

编辑：我已经广泛使用profilers。

解决方案

1）使用 __ restrict 。

2）通过使用 __ pure 。

3）可以找到SSE / SIMD的简介此处和此处。互联网并没有完全溢出与这个话题的文章，但足够了。对于宏并行化，您可以尝试使用 OpenMP 。这是一个易于任务并行化的编译器标准 - 实质上，你告诉编译器使用一些#pragmas代码的某些部分是可重入的，编译器为你自动创建线程。

5）我第二个interjay的观点，PGO可以很好地帮助。与＃3和＃4不同，它几乎可以轻松添加。

I have a very large program which I have been compiling under visual studio (v6 then migrated to 2008). I need the executable to run as fast as possible. The program spends most of its time processing integers of various sizes and does very little IO.

Obviously I will select maximum optimization, but it seems that there are a variety of things that can be done which don't come under the heading of optimization which do still affect the speed of the executable. For example selecting the __fastcall calling convention or setting structure member alignment to a large number.

So my question is: Are there other compiler/linker options I should be using to make the program faster which are not controlled from the "optimization" page of the "properties" dialog.

EDIT: I already make extensive use of profilers.

解决方案

1) Reduce aliasing by using __restrict.

2) Help the compiler in common subexpression elimination / dead code elimination by using __pure.

3) An introduction to SSE/SIMD can be found here and here. The internet isn't exactly overflowing with articles about the topic, but there's enough. For a reference list of intrinsics, you can search MSDN for 'compiler intrinsics'.

4) For 'macro parallelization', you can try OpenMP. It's a compiler standard for easy task parallelization -- essentially, you tell the compiler using a handful of #pragmas that certain sections of the code are reentrant, and the compiler creates the threads for you automagically.

5) I second interjay's point that PGO can be pretty helpful. And unlike #3 and #4, it's almost effortless to add in.

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