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This patch relaxes the subreg invariant that you can only change modes or make it paradoxical in one conversion. i.e. it now allows subreg:V2DI (reg:DF ..)) This is well defined in the generic sense and allowing it would enable you to write RTL without the extra moves which can be interfered with by combine. Patch has been pre-approved[1], but giving people chance to object [1] https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629119.html gcc/ChangeLog: * emit-rtl.cc (validate_subreg): Relax subreg rule.
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