在修改代码之前,可以先通过修改Xcode的配置实现编译速度的优化 Optimization Level。 Build Settings -> Optimization Level -> Debug模式下设置为None。 Build Settings -> User-Defined -> 添加 SWIFT_WHOLE_MODULE_OPTIMIZATION = YES Debug模式下不生成
链接时优化(Link-Time Optimization, LTO):LTO是一种在链接阶段进行的优化技术,它可以分析整个程序的代码,进行更深层次的优化。 要在Swift项目中启用这些优化,可以在Xcode的“Build Settings”中设置相应的编译标志。例如,要设置优化级别,可以在“Swift Compiler - Code Generation”部分的“Optimization Level”选项中选...
实验:测试 Optimization Level 在 None(不优化)、SFO、WMO 下分别对编译速度的影响 实验对象:基于 Swift 3 的奇点for 微博,约 24,000 行代码 实验方式:在 Debug 模式下分别选择一档优化,编译测试时间。 Xcode 配置: 显示编译时间: defaults write com.apple.dt.Xcode ShowBuildOperationDuration YES 测试结果: No...
内联主要原理是:将一些函数的实现直接编译入调用函数的位置中去,减少函数指针的栈调用,提高运行效率。当开启编译优化 (Optimization Level) 时,编译器会在直接派发方式基础上根据函数实际情况进行内联优化。下列情况编译器默认不会进行内联优化: 函数体过长(无形中增加了包体积,重复代码); 函数包含动态派发; 函数中包含...
假设还是上述代码,我们再将Build Setting中Swift Compiler - Code Generaation->Optimization Level修改为Optimize for Size[-Osize],汇编代码变成了下面这样? 代码语言:javascript 代码运行次数:0 运行 AI代码解释 0x1048c2114<+40>:bl0x1048c24b8;type metadata accessorforSwiftDemo.MyTestClass at<compiler-generat...
Setting SWIFT_OPTIMIZATION_LEVEL = -O on Xcode 15 crashes on iOS 11 - 12 Developer Tools & Services Xcode iOS Xcode likeli Created Sep ’23 Replies 1 Boosts 0 Views 1.9k Participants 1 var dic: [String: String] = [:] Use Xcode 15 to run the above code on iOS 11 and ...
Optimization Level: Fast,WMO [-O -whole module optimization] external definition: 0.088 seconds local definition: 0.088 seconds If you prefer here is a graph of the same results: It should not be a surprise that the test with no optimization is the slowest. What is interesting is the differe...
Optimization Level。 Build Settings -> Optimization Level -> Debug模式下设置为None。 Build Settings -> User-Defined -> 添加 SWIFT_WHOLE_MODULE_OPTIMIZATION = YES Debug模式下不生成dSYM文件。 dSYM(debug symbols file)是一个存储debug信息的文件,每次编译时都会生成。但在Debu模式下我们并不需要它,所以可...
SWIFT_OPTIMIZATION_LEVEL ) build setting. One option here is to compare the build transcript for your Debug and Release builds. You should see Xcode pass -Onone (aka No Optimisation) in the Debug build configuration and -O (aka Optimize for Speed) in the Release build. ...
Optimization Level (SWIFT_OPTIMIZATION_LEVEL) TheOptimization Levelsetting defines a way we’d like to optimize the build. Code optimizations result in slower build times because of the extra work involved in the optimization process.Debugbuilds should be configured withNo Optimization, since we need...