findMSB - find the index of the most significant bit set to 1 in an integer

       Copyright © 2011-2014 Khronos Group

[FIXME: source]                                    11/18/2024                                        FINDMSB(3G)

genITypefindMSB(genITypevalue);genITypefindMSB(genUTypevalue);

findMSB returns the bit number of the most significant bit that is set to 1 in the binary representation
       of value. For positive integers, the result will be the bit number of the most significant bit that is
       set to 1. For negative integers, the result will be the bit number of the most significant bit set to 0.
       For a value of zero or negative 1, -1 will be returned.

       findMSB - find the index of the most significant bit set to 1 in an integer

value
           Specifies the value whose bits to scan.

findLSB()

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       │          │        OpenGLShadingLanguageVersion                                            │
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       │ Function │ 1.10 │ 1.20 │ 1.30 │ 1.40 │ 1.50 │ 3.30 │ 4.00 │ 4.10 │ 4.20 │ 4.30 │ 4.40 │ 4.50 │
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       ├──────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │ findMSB  │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
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