https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112930
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Richard Sandiford <rsand...@gcc.gnu.org>: https://gcc.gnu.org/g:f5c8d6bc050a8a6120aff2be25b6892d91baac99 commit r14-6386-gf5c8d6bc050a8a6120aff2be25b6892d91baac99 Author: Richard Sandiford <richard.sandif...@arm.com> Date: Sun Dec 10 19:46:06 2023 +0000 aarch64: Fix SMSTART/SMSTOP save/restore for BE VNx16QI (the SVE register byte mode) is the only SVE mode for which LD1 and LDR result in the same register layout for big-endian. It is therefore the only mode for which we allow LDR and STR to be used for big-endian SVE moves. The SME support sometimes needs to use LDR and STR to save and restore Z register contents around an SMSTART/SMSTOP SM. It therefore needs to use VNx16QI regardless of the type of value that is stored in the Z registers. gcc/ PR target/112930 * config/aarch64/aarch64.cc (aarch64_sme_mode_switch_regs::add_reg): Force specific SVE modes for single registers as well as structures.
