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blog-static/code/compiler/13
Danila Fedorin cf6f353f20 Change tagging to assume sign extension.
ARM and x86_64 require "real" pointers to be
sign-extended in their top bits. This means
a working pointer is guaranteed to have either "11"
as leading bits, or "00". So, to tag a "fake" pointer
which is an unboxed 32-bit integer, we simply toggle
the leading bit.
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