Risky, 14 bytes

__-+_-2{[?+_0:__0+_0+__?+_0

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Explanation:

• __-+_-: -2, written as -1 + -1 with padding
• 2: Power
• {[?+_0: log_2(abs(input)), with +_0 as padding
• :: Equals
• __0+_0+__?+_0: Input (?), with padding

So basically, -2 ** log_2(abs(input)) == input

Risky, 14 bytes

__-+_-2{[?+_0:__0+_0+__?+_0

Try it online!

Explanation:

• __-+_-: -2, written as -1 + -1 with padding
• 2: Power
• {[?+_0: log_2(abs(input)), with +_0 as padding
• :: Equals
• __0+_0+__?+_0: Input (?), with padding

So basically, -2 ** log_2(abs(input)) == input

Risky, 14 bytes

__-+_-2{[?+_0:__0+_0+__?+_0

Try it online!

Risky, 14 bytes

__-+_-2{[?+_0:__0+_0+__?+_0

Try it online!

Explanation:

• __-+_-: -2, written as -1 + -1 with padding
• 2: Power
• {[?+_0: log_2(abs(input)), with +_0 as padding
• :: Equals
• __0+_0+__?+_0: Input (?), with padding

So basically, -2 ** log_2(abs(input)) == input