<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="generator" content="TempleOS V5.03"> <link rel="stylesheet" href="/style/templeos.css"> <script src="/script/templeos.js"></script> <style type="text/css"> .cF0{color:#000000;background-color:#ffffff;} .cF1{color:#0000aa;background-color:#ffffff;} .cF2{color:#00aa00;background-color:#ffffff;} .cF3{color:#00aaaa;background-color:#ffffff;} .cF4{color:#aa0000;background-color:#ffffff;} .cF5{color:#aa00aa;background-color:#ffffff;} .cF6{color:#aa5500;background-color:#ffffff;} .cF7{color:#aaaaaa;background-color:#ffffff;} .cF8{color:#555555;background-color:#ffffff;} .cF9{color:#5555ff;background-color:#ffffff;} .cFA{color:#55ff55;background-color:#ffffff;} .cFB{color:#55ffff;background-color:#ffffff;} .cFC{color:#ff5555;background-color:#ffffff;} .cFD{color:#ff55ff;background-color:#ffffff;} .cFE{color:#ffff55;background-color:#ffffff;} .cFF{color:#ffffff;background-color:#ffffff;} </style> </head> <body> <pre style="font-family:courier;font-size:10pt"> <a name="l1"></a><span class=cF0> <a name="l2"></a></span><span class=cF5>These take a pointer to a bit field.</span><span class=cF0> <a name="l3"></a></span><span class=cF2>Bt</span><span class=cF0>: Bit Test <a name="l4"></a></span><span class=cF2>Bts</span><span class=cF0>: Bit Test and Set to one <a name="l5"></a></span><span class=cF2>Btr</span><span class=cF0>: Bit Test and Rst to zero <a name="l6"></a></span><span class=cF2>Btc</span><span class=cF0>: Bit Test and Compliment (toggle) <a name="l7"></a></span><span class=cF2>BEqu</span><span class=cF0>: Set bit to value. <a name="l8"></a> <a name="l9"></a>Bit operations are "atomic", no interrupt between the reading and writing the <a name="l10"></a>bit, important when multitasking. For multicore use "locked" forms. <a name="l11"></a> <a name="l12"></a></span><span class=cF5>These don't take a pointer, but the actual field.</span><span class=cF0> <a name="l13"></a></span><span class=cF2>Bsf</span><span class=cF0>: Bit Scan Fwd (Pos of first low one bit or -1) <a name="l14"></a></span><span class=cF2>Bsr</span><span class=cF0>: Bit Scan Rev (Pos of first high one bit or -1) <a name="l15"></a></span><span class=cF2>BCnt</span><span class=cF0>: Bit Cnt (Cnt of set bits) </span></pre></body> </html>