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x86 assembly language (FASM). The argument and the result are in eax register.
It works properly for -2E302^30 < N < +2E30+2^30-1
16 bytes executable code.
use32 f_n: lea edx, [2*eax] xor edx, eax btc eax, 30 shl edx, 1 jnc .end neg eax .end: retn
It works properly for -2E30 < N < +2E30-1
It works properly for -2^30 < N < +2^30-1
