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Why is x86 ugly? Why is it considered inferior when compared to others? [closed]
...
Consider the operation "a=b/c" x86 would implement this as
mov eax,b
xor edx,edx
div dword ptr c
mov a,eax
As an additional bonus of the div instruction edx will contain the remainder.
A RISC processor would require first loading the addresses of b and c, loading b and c from memory to ...
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
...i_escape 0x10,0x6,0x2,0x75,0x78
.cfi_escape 0x10,0x3,0x2,0x75,0x74
xorl %edi, %edi
subl $24, %esp
call ___main
L4:
movl %edi, (%esp)
movl $__ZSt4cout, %ecx
call __ZNSolsEi
movl %eax, %esi
movl (%eax), %eax
subl $4, %esp
movl -...
Programmer Puzzle: Encoding a chess board state throughout a game
...not to, at least in part, resemble a starting position.
So what you do is XOR the 256 bit current board position with a 256 bit starting position and then encode that (using Huffman coding or, say, some method of run length encoding). Obviously this will be very efficient to start with (64 0s proba...
How to run a program without an operating system?
....S
.code16
.text
.global mystart
mystart:
ljmp $0, $.setcs
.setcs:
xor %ax, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %ss
mov $__stack_top, %esp
cld
call main
linker.ld
ENTRY(mystart)
SECTIONS
{
. = 0x7c00;
.text : {
entry.o(.text)
*(.text)
*(.data)
...
Relational table naming convention [closed]
... description or whatever.
That's right. Either user_product_description xor product_description will be correct, based on the above. It is not to differentiate it from other xxxx_descriptions, but it is to give the name a sense of where it belongs, the prefix being the parent table.
What abo...
Simple way to encode a string according to a password?
...less you read this and don't mind talking with lawyers:
What's wrong with XOR encryption?
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Win32汇编--使用MASM - C/C++ - 清泛网 - 专注C/C++及内核技术
...开指令和操作数可以使格式对齐，便于阅读。如：
xor eax,eax
fistp dwNumber
xchg eax,ebx
上述代码的写法就不如下面的写法整齐：
xor eax,eax
fistp dwNumber
xchg eax,ebx
还有就是缩进格式...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...度得以支撑；同时在可靠性方面，Storm的ack组件利用异或xor算法在不失性能的同时，保证每一个消息得到完整处理的同时。
11) 实时推送
实时推送的应用场景非常多，比如系统的监控动态的实时曲线绘制，手机消息的推送，web...
Sleep until a specific time/date
...anted to wait until next week:
expr `date -d "next week" +%s` - `date -d "now" +%s`
Just substitute "next week" with whatever date you'd like to wait for, then assign this expression to a value, and sleep for that many seconds:
startTime=$(date +%s)
endTime=$(date -d "next week" +%s)
timeToWait=...
How to get datetime in JavaScript?
...t; 10) ? "0" + num : num + "";
}
window.onload = function() {
var now = new Date();
var strDateTime = [[AddZero(now.getDate()),
AddZero(now.getMonth() + 1),
now.getFullYear()].join("/"),
[AddZero(now.getHours()),
AddZero(now.getMinutes())].join("...