3. 误区三：性能优化=暴力调优 事实：clang的OptimizeForSize选项可减少42%内存 九、终极决策矩阵：五维评估模型 疑问环节：你的项目更看重哪些维度？ | 评估维度 | clang得分 | gcc得分 | |---|---|---| | 代码生成 | | | | 编译速度 | | | | 生态成熟度 | | | | 安全...
Optimize scheduling for the specified CPU model. 为某个平台优化,这个比-mcpu要“温和”一点。 Quote:“ The option -mtune=cpu is more tolerant. Code generated with -mtune=cpu uses optimized scheduling parameters for the given CPU model, but adheres to the family's common instructions and regis...
Optimize scheduling for the specified CPU model. 为某个平台优化,这个比-mcpu要“温和”一点。 Quote:“ The option -mtune=cpu is more tolerant. Code generated with -mtune=cpu uses optimized scheduling parameters for the given CPU model, but adheres to the family's common instructions and regis...
we generally want to inline only cheap (runtime wise) functions. */elseif(opt_for_fn (callee->decl, optimize_size) < opt_for_fn (caller->decl, optimize_size) || (opt_for_fn (callee->decl, optimize) > opt_for_fn (caller->decl, optimize))) {if(estimate_edge_time (e) >=20+ ...
可以看到这个for循环就是把struct TileContentIndexStruct g_tileContentVector[10]这个数组的内容拷贝到struct TileContentIndex g_tileContentIndexList[10]这个数组中。其中sizeof(TileContentIndexStruct) = 40，sizeof(TileContentIndex) = 24。汇编中通过x0 = (x1 - 1) * 40 + (x0 + 40) = x1 * 40 ...
-Os: optimizes code for size. It activates all -O2 options that do not increase the size of the generated code. It can be useful for machines that have extremely limited disk storage space and/or CPUs with small cache sizes. -Og: In GCC 4.8, a new general optimization level, -Og, ...
-Os: optimizes code for size. It activates all -O2 options that do not increase the size of...
默认情况下,编译器限制内联的尺寸,3.4.6 中限制为 600(具体含义不详,指令条数或代码 size?)可以通过-finline-limit=n 改变这个长度。这种优化技术不为函数创建单独的汇编语言代码, 而是把函数代码包含在调度程序的代码中。 对于多次被调用的函数来说, 为每次函数调用复制函数代码。 虽然这样对于减少代码长度不利,...
-OsOptimize to reduce code size, potentially if your application is limited by fetching instructions. -O2Considered standard GCC optimization option and good to use as a baseline to compare with other GCC options. -O3Adds additional optimizations to generate more efficient codes for loops, useful ...
c 文件) --cpp Switch to C++ mode (default for .cpp files) 切换到C++模式 (默认.cpp 文件) -O0 Minimum optimization 最小优化级别 -O1 Restricted optimization for debugging 受限的调试级别优化 -O2 High optimization 高优化 -O3 Maximum optimization 最大优化 -Ospace Optimize for codesize 对代码大小...