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Is “for(;;)” faster than “while (TRUE)”? If not, why do people use it?
... while(42) is the coolest, produces no different result with respect to while(1) or while(true) or while(!0), and has philosophical meaning. I suppose for(;;) is parsed faster than the others anyway
– ShinTakezou
Jun 10 '10 at 12:21
...
BSS段、数据段、代码段、堆与栈 剖析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...i$ = -404
_main PROC NEAR
; File test.cpp
; Line 13
push ebp
mov ebp, esp
sub esp, 404 ; 00000194H
push edi
; Line 14
mov DWORD PTR _run$[ebp], 1
mov DWORD PTR _run$[ebp+4], 2
mov DWORD PTR _run$[ebp+8], 3
mov DWORD PTR _run$[ebp+12], 4
mov DWORD PTR _run$[ebp+16], 5
mov DWORD PTR _run...
C++对象布局及多态探索之菱形结构虚继承 - C/C++ - 清泛网 - 专注C/C++及内核技术
...到子类的成员变量。
01 00426C00 push ebp
02 00426C01 mov ebp,esp
03 00426C03 sub esp,0CCh
04 00426C09 push ebx
05 00426C0A push esi
06 00426C0B push edi
07 00426C0C push ecx
08 00426C0D lea edi,[ebp+FFFFFF34h]
09 00426C13 mov ecx,33h
10 00426C18 mov eax,0CCCCCCCCh
11 ...
When should the volatile keyword be used in C#?
...es before and after reads and
writes may be observed to be ordered with respect to each other.
Certain operations such as creating a new thread, entering a lock, or
using one of the Interlocked family of methods introduce stronger
guarantees about observation of ordering. If you want more de...
How exactly does the callstack work?
...standing of how the low level operations of programming languages work and especially how they interact with the OS/CPU. I've probably read every answer in every stack/heap related thread here on Stack Overflow, and they are all brilliant. But there is still one thing that I didn't fully understand...
Is there any overhead to declaring a variable within a loop? (C++)
...0) { var = 4; } }
gcc -S 1.c
1.s:
_main:
pushl %ebp
movl %esp, %ebp
subl $24, %esp
movl $0, -16(%ebp)
jmp L2
L3:
movl $4, -12(%ebp)
L2:
cmpl $99, -16(%ebp)
jle L3
leave
ret
2.c
main() { while(int i < 100) { int var = 4; } }
gcc -S ...
What is the purpose of the EBP frame pointer register?
...ocal variable or an argument is at with a single constant offset. Although ESP's value changes over the course of execution, EBP remains the same making it possible to reach the same variable at the same offset (such as first parameter will always be at EBP+8 while ESP offsets can change significant...
Try-catch speeding up my code?
...le stores and the way the JIT compiler does register scheduling in the corresponding x86 code. The result is suboptimal code generation on the loads and stores of the locals.
For some reason unclear to all of us, the problematic code generation path is avoided when the JITter knows that the block i...
Difference between passing array and array pointer into function in C
... type derivation, then for each call to the function, the value of the corresponding
actual argument shall provide access to the first element of an array with at least as many
elements as specified by the size expression.
So, in short, any function parameter declared as T a[] or T a[N] is treated...
How does this milw0rm heap spraying exploit work?
...EA8331FC0B6A6A jmp 0x6a6a:0xbfc3183
00000017 03D4 add edx,esp
00000019 07 pop es
0000001A 67305CFF xor [si-0x1],bl
0000001E 98 cwde
0000001F BBD7FFA4FE mov ebx,0xfea4ffd7
00000024 9B wait
00000025 74AD j...