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How do function pointers in C work?
... mov ebx,DWORD PTR [ebx]
c: 31 c3 xor ebx,eax # pointless xor-swap
e: 31 d8 xor eax,ebx # instead of just storing with opposite registers
10: 31 c3 xor ebx,eax
12: 8b 4c 2...
Swapping column values in MySQL
...ng the left-to-right evaluation process in MySQL.
Alternatively, just use XOR if they're numbers. You mentioned coordinates, so do you have lovely integer values, or complex strings?
Edit: The XOR stuff works like this by the way:
update swapper set foo = foo ^ bar, bar = foo ^ bar, foo = foo ^ b...
Wolfram's Rule 34 in XKCD [closed]
...gt; 1
You can do all of this with a single "color" of comparing (like an XOR circuit for example) and even merge this operation with the write operation. Then by keeping 2 control bits somewhere (o and 1 at the beginning of your memory) you can accomplish writing a plain 0 or 1 by comparing those ...
Write bytes to file
... 6 bytes into a byte array and writes it to another byte array. It does an XOR operation with the bytes so that the result written to the file is the same as the original starting values. The file is always 6 bytes in size, since it writes at position 0.
using System;
using System.IO;
namespace Co...
.NET JIT potential error?
...lue properly:
for (oVec.x = 0; oVec.x < 2; oVec.x++) {
0000000a xor esi,esi ; oVec.x = 0
for (oVec.y = 0; oVec.y < 2; oVec.y++) {
0000000c mov edi,2 ; oVec.y = 2, WRONG!
oDoesSomething.Do(oVec);
000000...
What's a correct and good way to implement __hash__()?
... suggests to combine the hashes of the sub-components using something like XOR, which gives us this:
class B(object):
def __init__(self, a, b, c):
self._a = a
self._b = b
self._c = c
def __eq__(self, othr):
if isinstance(othr, type(self)):
retur...
How did I get a value larger than 8 bits in size from an 8-bit integer?
...
The assembler code reveals the problem:
:loop
mov esi, ebx
xor eax, eax
mov edi, OFFSET FLAT:.LC2 ;"c: %i\n"
sub ebx, 1
call printf
cmp ebx, -301
jne loop
mov esi, -45
mov edi, OFFSET FLAT:.LC2 ;"c: %i\n"
xor eax, eax
call printf
EBX should be anded with FF post decremen...
How to simplify a null-safe compareTo() implementation?
...
Sweet use of XOR
– James McMahon
Mar 30 '12 at 18:53
9
...
When should the volatile keyword be used in C#?
... (IA32):
void main()
{
00401000 push ecx
int j = 0;
00401001 xor ecx,ecx
for (int i = 0 ; i < 100 ; ++i)
00401003 xor eax,eax
00401005 mov edx,1
0040100A lea ebx,[ebx]
{
j += i;
00401010 add ecx,eax
00401012 add eax,e...
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
..._run$[ebp+28], 8
mov DWORD PTR _run$[ebp+32], 9
mov ecx, 91 ; 0000005bH
xor eax, eax
lea edi, DWORD PTR _run$[ebp+36]
rep stosd
; Line 15
mov DWORD PTR _i$[ebp], 0
jmp SHORT $L534
$L535:
mov eax, DWORD PTR _i$[ebp]
add eax, 1
mov DWORD PTR _i$[ebp], eax
$L534:
cmp DWORD PTR _i$[ebp], 1...