Branch: refs/heads/blead
Home: https://github.com/Perl/perl5
Commit: d349122ed895383f42f8e8c8786a5316e523735d
https://github.com/Perl/perl5/commit/d349122ed895383f42f8e8c8786a5316e523735d
Author: bulk88 <bul...@hotmail.com>
Date: 2025-07-15 (Tue, 15 Jul 2025)
Changed paths:
M sv.c
Log Message:
-----------
sv.c: sv_2mortal() move SvTEMP_on(sv); for RISC CPUs
RISC CPUs can not read from memory and do anything else in 1 opcode.
These x64 instructions are impossible to do in 1 opcode on ARM.
F7 42 0C 00 00 01 08 test dword ptr [rdx+0Ch], 8010000h
and
0F BA 6B 0C 13 bts dword ptr [rbx+0Ch], 13h
Since editing macro SvIMMORTAL() to remove SvREADONLY() is out of scope,
flip the order around, so the contents sv->sv_flags can be reused, and not
re-read around fn call Perl_tmps_grow_p().
sv_2mortal() is a libperl export, it doesn't inline.
"SvTEMP_on(sv);" can not have any CC inline synergy/de-duping
opportunities with its caller frame, regardless if SvTEMP_on() is on the
top or bottom of sv_2mortal(). sv.c itself never calls sv_2mortal().
All functions inside sv.c use the lightweight PUSH_EXTEND_MORTAL__SV_C()
macro, not sv_2mortal().
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