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Nobody proposed a vec solution yet. Here’s one:
use feature say; $_ = "012\xf0ABC\x0f\x00\x01\xff"; say unpack "H*"; # 303132f04142430f0001ff for (my $i = length; $i--; vec($_, $i, 8) ^= ~0) {} say unpack "H*"; # cfcecd0fbebdbcf0fffe00
Could probably be optimized for 32/64 bits. Whatever. I'm too lazy to benchmark it.

In reply to Re: In-place bitwise NOT? by Grimy
in thread In-place bitwise NOT? by BrowserUk

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