Why? It is analogous to "this" parameter in C++. The alternative is calling 4 functions each time, win32/win32thread.c#l23 in perl.git.

In reply to Re^14: Perl 5 Optimizing Compiler, Part 4: LLVM Backend? by bulk88
in thread Perl 5 Optimizing Compiler, Part 4: LLVM Backend? by Will_the_Chill

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