Optimize even more. GCC performs nearly all supported optimizations that do not involve a space-speed tradeoff. The compiler does not perform loop unrolling or function inlining when you specify `-O2 '. As compared to `-O ', this option increases both compilation time and the performance of t...
Optimize even more. GCC performs nearly all supported optimizations that do not involve a space-speed tradeoff. The compiler does not perform loop unrolling or function inlining when you specify `-O2 '. As compared to `-O ', this option increases both compilation time and the performance of t...
int sub_func(int a) { return a + 1; } /* main.c */ #include #include "sub.h" #ifdef USED_FUNC void used_func(void) { printf("This is a used function !\n"); } #endif int main(int argc, const char *argv[]) { printf("Hello world !\n"); printf("TEST_NUM = %d\n",...
-fbranch-target-load-optimize 在序言/结尾线程之前执行分支目标寄存器加载优化。 目标寄存器的使用通常只能在重新加载期间公开,因此将负载提升出循环并进行块间调度需要单独的优化过程。 -fbranch-target-load-optimize2 在序言/结尾线程之后执行分支目标寄存器加载优化。 --param name=value 在某些地方,GCC 使用各种常...
-O1 Optimize. Optimizing compilation takes somewhat more time, and a lot more memory for a large function. -O2 Optimize even more. GCC performs nearly all supported optimizations that do not involve a space-speed tradeoff. As compared to -O, this option increases both compilation time and the...
gcc -Wchar-subscripts test_signed_char.ctest_signed_char.c: In function `main':test_signed_char.c:13: warning: array subscript has type `char' 其输出结果:-1-41974761从输出结果来看Solaris 9/gcc 3.2上char默认实现类型为signed char;在Windows XP/gcc-3.4.2上也是一样。Windows上的输出结果:-116...
-GD 为 Windows DLL 进行优化 optimize for Windows DLL -GB 为混合模型进行优化(默认) optimize for blended model (default) -EHa 启用异步 C++ 异常处理 enable asynchronous C++ EH -Gd __cdecl 调用约定 __cdecl calling convention -EHc extern“C”默认为 nothrow extern "C" defaults to nothrow ...
This attribute should be used for debugging purposes only. It is not suitable in production code. optimize属性的作用是,在编译时使用指明的优化编译选项,而不用编译命令里指定的优化参数。参数值可以是数字,也可以是字符串。数字就是优化级别。以O开头的字符串被认为是一个优化选项,其他的选项以-f开头。当然...
[-] 启用增量编译 enable incremental compilation-Gz __stdcall 调用约定 __stdcall calling convention-Gm[-] 启用最小重新生成 enable minimal rebuild-GA 为 Windows 应用程序进行优化 optimize for Windows Application-Gf 启用字符串池 enable string pooling-QIfdiv[-] 启用 Pentium FDIV 修复 enable Pentium ...
Optimize even more. GCC performs nearly all supported optimizations that do not involve a space-speed tradeoff. The compiler does not perform loop unrolling or function inlining when you specify `-O2 '. As compared to `-O ', this option increases both compilation time and the performance of ...