如何处理编译器优化问题 [英] How to deal with compiler optimization problems

问题描述

我的 iPhone 应用程序遇到了烦人的问题.每当我将优化级别设置为无"以外的其他值时，都会出现计算错误.这只发生在为 iPhone SDK 构建时(iPhone 模拟器总是很好).

I'm having an annoying problem with my iPhone app. Whenever I set the optimization level to something other than "None", I get computation errors. This only happens in when building for the iPhone SDK (the iPhone Simulator is always fine).

我不介意在发布模式下禁用优化，但是当我这样做时应用程序有点太慢了.

I wouldn't mind disabling optimizations in release mode, but the application is a tiny bit too slow when I do that.

应用程序复杂，很难找到优化过度的部分.

The application is complex, so it is hard to locate the part that is too aggressively optimized.

我认为问题出在 GCC 方面，因为它似乎在优化 ARM 架构的代码方面存在问题.

I think that the problem is on the GCC side since it seems to have problem optimizing the code for the ARM architecture.

有没有办法只对代码的某些部分禁用优化?你会如何处理这种问题?

Is there a way to only disable optimizations only for certain part of the code? How would you deal with that kind of issue?

推荐答案

是的，这完全有可能.GCC 有一个属性:

Yes, that's entirely possible. GCC has an attribute for that:

/* disable optimization for this function */
void my_function(void) __attribute__((optimize(0)));

void my_function(void) {
    /* ... */
}

将该函数的优化级别设置为 -O0.您可以启用/禁用特定优化:

Sets the optimization level for that function to -O0. You can enable/disable specific optimizations:

/* disable optimization for this function */
void my_function(void) __attribute__((optimize("no-inline-functions")));

void my_function(void) {
    /* ... */
}

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