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John Carmack's Unusual Fast Inverse Square Root (Quake III)

...oat, 4x faster than regular (float)(1.0/sqrt(x)) , including a strange 0x5f3759df constant. See the code below. Can someone explain line by line what exactly is going on here and why this works so much faster than the regular implementation? ...
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how to pass an integer as ConverterParameter?

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Why do access tokens expire?

... answered Aug 12 '11 at 5:28 Eran HammerEran Hammer 6,46622 gold badges2727 silver badges2222 bronze badges ...
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Spring classpath prefix difference

... | edited Mar 4 '15 at 14:15 geoand 45.8k1313 gold badges133133 silver badges141141 bronze badges ...
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Entity Framework and Connection Pooling

... | edited Jul 2 '14 at 12:51 ebram khalil 8,00177 gold badges3737 silver badges5454 bronze badges answer...
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Escape double quotes in a string

... | edited Nov 21 '15 at 22:35 Peter Mortensen 26.5k2121 gold badges9292 silver badges122122 bronze badges ...
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Foreign Key to multiple tables

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How to install Java 8 on Mac

... | edited Jun 3 at 18:05 Brad Solomon 25.2k1414 gold badges8989 silver badges148148 bronze badges ans...