Nuke the MGf_PERSIST flag, freeing a bit in ->mg_flags #23161
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The MGf_PERSIST flag is only used by PERL_MAGIC_lvref, and there it simply contains a shadow copy of the OPpLVREF_ITER flag in op_private. Since the mg_priv field is set as a copy of op_private anyway, the code that checks this bit might as well look there instead. As a result of this change, the 0x80 bit of the mg_flags field is now free for other purposes.
tonycoz
approved these changes
Mar 30, 2025
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The MGf_PERSIST flag is only used by PERL_MAGIC_lvref, and there it simply contains a shadow copy of the OPpLVREF_ITER flag in op_private. Since the mg_priv field is set as a copy of op_private anyway, the code that checks this bit might as well look there instead.
As a result of this change, the 0x80 bit of the mg_flags field is now free for other purposes.