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Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
In the x86-64 Tour of Intel Manuals , I read
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Which is faster : if (bool) or if(int)?
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Makes sense to me. Your compiler apparently defines a bool as an 8-bit value, and your system ABI requires it to "promote" small (< 32-bit) integer arguments to 32-bit when pushing them onto the call stack. So to compare a bool, the compiler generates code to isolate the least significant byte...
Multiple select statements in Single query
...ble')
If you have InnoDB you have to query with count() as the reported value in information_schema.tables is wrong.
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Unix shell script find out which directory the script file resides?
Basically I need to run the script with paths related to the shell script file location, how can I change the current directory to the same directory as where the script file resides?
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nginx error “conflicting server name” ignored [closed]
...swered Dec 23 '12 at 13:45
Omar Al-IthawiOmar Al-Ithawi
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Algorithm for Determining Tic Tac Toe Game Over
... made their most recent move, so you can only search row/column with optional diag that are contained in that move to limit your search space when trying to determine a winning board. Also since there are a fixed number of moves in a draw tic-tac-toe game once the last move is made if it wasn't a w...
cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术
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GenuineTMx86 或 TransmetaCPU ---- Transmeta
Geode by NSC ---- National Semiconductor
NexGenDriven ---- NexGen
SiS SiS SiS ---- SiS
RiseRiseRise ---- Rise
UMC UMC UMC ---- UMC
VIA VIA VIA ---- VIA
5、EAX=1：处理器签名（Processor Signiture）和功能（Feature）位
mov e...
第一个Hello,OS World操作系统 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...此处指向数据区的字符串
_LOOP: ;循环指令开始
MOV AL, [SI] ;[]取地址中的内容，AL是AX的低8位，所以取8bit，即1字节，字符串的ASCII。
ADD SI, 1 ;字符串往后移动一个字节
CMP AL, 0 ;判断当前取出的ASCII是否是0,
JE _END ;J...
MySQL Results as comma separated list
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Also, quick note that if you're using PHPMyAdmin and want to output a comma-delimited list to the page, use GROUP_CONCAT(CAST(s.name AS CHAR)) or else it will just return something wholly unuseful like [BLOB - 20 Bytes].
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Simplest way to detect a mobile device in PHP
...match('/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone...