我们的内部程序是用C编写的，在很多方面都广泛使用snprintf（），我注意到在进行perf记录/报告调试期间，它在以下方面花费了大量时间： │ _IO_vfprintf_internal(): ...

This question already has answers here: Should we generally use float literals for floats instead of the simpler double literals? ...

This question already has answers here: Conditional SSE/AVX add or zero elements based on compare ...

我写了一个中间函数钩子，发现该函数的原始局部变量被我在函数中声明的变量所覆盖。 这是我的代码： DWORD jbPlantTrap = 0x48ED53 + 7; DWORD jbPlantTrapSkip = 0x48EDD6; __declspec(naked) void hkPlantTrap() { __asm { PUSHAD PUSHFD } // this variable is overwriting the original...

This question already has answers here: How safe is this swap w/o pushing registers? ...

我最近在一个用GCC 8编译的软件中研究了段错误。代码如下所示（这只是一个草图） struct Point { int64_t x, y; }; struct Edge { // some other fields // ... Point p; // <- at offset `0xC0` Edge(const Point &p) p(p) {} }; Edge *create_edge(const Point &p) { void raw_memory = my_custo...

I have the following assembly program from the binary-bomb lab. The goal is to determine the keyword needed to run the binary without triggering the explode_bomb function. I commented my analysis of the assembly for this program but I am having trouble pie...

When I compile this snippet (with -Ofast -fnest-loop-optimize) gcc generates assembly which traverses the array in source order. However if I uncomment the line // n = 32767 and assign any number to n, it interchanges the index order to x[i * n + j]. Trav...

I've got some code that gcc (4.8.5, if it matters) compiles into nearly identical binary on two different machines except for one spot, where something in the toolchain on one machine decides to use a "near" JE instruction while the toolchain on the other ...

带有执行时间的内存映射： 这是与之对应的汇编代码： ; Listing generated by Microsoft (R) Optimizing Compiler Version 19.16.27027.1 TITLE c:\LearningTree\348LM\CoursePrograms\348L\Chap1\var.c .686P .XMM include listing.inc .model flat INCLUDELIB LIBCMT INCL...