You should (only) use sv_2mortal() on scalars that are placed on the stack.

I disagree. Some people, including CPAN authors, use sv_2mortal() and sv_grow() as a direct replacement for alloca in XS. I prefer the real alloca.

# define alloca( size )    sv_grow( sv_newmortal(), size )

In reply to Re^2: When to (and not to) use sv_2mortal() by patcat88
in thread When to (and not to) use sv_2mortal() by davido

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