https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113657
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:dbf847d2c8d1c910948ba34c9338939c67323273 commit r14-8671-gdbf847d2c8d1c910948ba34c9338939c67323273 Author: Andrew Pinski <quic_apin...@quicinc.com> Date: Tue Jan 30 00:50:56 2024 -0800 aarch64: -mstrict-align vs __arm_data512_t [PR113657] After r14-1187-gd6b756447cd58b, simplify_gen_subreg can return NULL for "unaligned" memory subreg. Since V8DI has an alignment of 8 bytes, using TImode causes simplify_gen_subreg to return NULL. This fixes the issue by using DImode instead for the loop. And then we will have later on the STP/LDP pass combine it back into STP/LDP if needed. Since strict align is less important (usually used for firmware and early boot only), not doing LDP/STP here is ok. Built and tested for aarch64-linux-gnu with no regressions. PR target/113657 gcc/ChangeLog: * config/aarch64/aarch64-simd.md (split for movv8di): For strict aligned mode, use DImode instead of TImode. gcc/testsuite/ChangeLog: * gcc.target/aarch64/acle/ls64_strict_align.c: New test. Signed-off-by: Andrew Pinski <quic_apin...@quicinc.com>
