https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120036
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by H.J. Lu <h...@gcc.gnu.org>: https://gcc.gnu.org/g:b8c4b6aa8e0521770c6f9fd48dd13dd85e3a2fc9 commit r16-436-gb8c4b6aa8e0521770c6f9fd48dd13dd85e3a2fc9 Author: H.J. Lu <hjl.to...@gmail.com> Date: Thu May 1 06:30:41 2025 +0800 x86: Insert extra move for mode size smaller than natural size When generating a SUBREG from V16QI to V2HF, validate_subreg fails since V2HF is a floating point vector and its size (4 bytes) is smaller than its natural size (word size). Insert an extra move with a QI vector SUBREG of the same size to avoid validate_subreg failure. gcc/ PR target/120036 * config/i386/i386-features.cc (ix86_get_vector_load_mode): Handle 8/4/2 bytes. (remove_redundant_vector_load): If the mode size is smaller than its natural size, first insert an extra move with a QI vector SUBREG of the same size to avoid validate_subreg failure. gcc/testsuite/ PR target/120036 * g++.target/i386/pr120036.C: New test. * gcc.target/i386/pr117839-3a.c: Likewise. * gcc.target/i386/pr117839-3b.c: Likewise. Signed-off-by: H.J. Lu <hjl.to...@gmail.com>
