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🐪 The Perl programming language
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Perl_leave_adjust_stacks: additional efficiency for mortal copies #22163

Open richardleach opened 3 weeks ago

richardleach commented 3 weeks ago

The existing code has a fast path for copying a SVt_NULL or SVt_IV. For all other types, a new SVt_NULL is passed into sv_setsv_flags, where it will be upgraded into the required type by sv_upgrade().

This commit makes two changes: 1) Special case copying a SVt_NV where possible, as sv_setsv_flags does. 2) It's safe and more efficient to directly create a new type of SVt_PVNV or below, rather than upgrade it later, so do that.

richardleach commented 3 weeks ago

This can be defer-next-dev.