blitz-research
26 lines
2.1 KiB
HTML
26 lines
2.1 KiB
HTML
<html><head><title>Command: Sar </title><meta http-equiv='Content-Type' content='text/html; charset=iso-8859-1'><link rel='stylesheet' href='../css/commands.css' type='text/css'></head><body><span class='Command'> Sar repetitions </span></p><span class='header'>Definition:</span> <br><br><table width='100%' border='0' cellspacing='2' cellpadding='2' align='center'><tr><td>Performs binary shift right.</td></tr></table><span class='header'><br>Parameter Description:</span> <br><br><table width='100%' border='0' cellspacing='2' cellpadding='2' align='center'><tr><td>repetitions = number of shifts to make right</td></tr></table><p class='header'>Command Description: <br><br><table width='100%' border='0' cellspacing='2' cellpadding='2' align='center'><tr><td>This performs a left binary shift on the value the specified number of times. This basically is a faster method of dividing the value exponentially. By shifting right once, you are dividing the value by 2. By shifting right twice, you divide by 4, etc.<br>
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<br>
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Sar command varies from <a href='Shr.htm'>Shr</a> whereas it fills blank bits shifted with copies of the sign bit, 0 for positive numbers and 1 for negative.
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<br>
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The usefulness of this command is basically faster math execution. Also see <a href='Shl.htm'>Shl</a>.</td></tr></table><p class='header'>Example: <br><br><table width='100%' border='0' cellspacing='2' cellpadding='2' align='center'><tr><td>; shl, shr, sar examples<br>
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<br>
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value = 100<br>
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<br>
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; multiple x 2<br>
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Print "Shift 1 bit left; Value = " + value Shl 1<br>
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; multiple x 4<br>
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Print "Shift 2 bits left; Value = " + value Shl 2<br>
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; multiple x 16<br>
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Print "Shift 4 bits left; Value = " + value Shl 4<br>
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; divide by 2<br>
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Print "Shift 1 bit right; Value = " + value Shr 1<br>
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; divide by 4<br>
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Print "Shift 2 bits right; Value = " + value Shr 2<br>
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; divide by 16<br>
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Print "Shift 4 bits right; Value = " + value Shr 4<br>
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<br>
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Print "Shift by SAR 4 times = " + value Sar 4<br>
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<br>
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WaitKey()<br></td></tr></table><p><b><a target="_top" href="../index.htm">Index</a></b></p></body>
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</html>
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