https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112381
--- Comment #4 from Kostadin <kocelfc at tutanota dot com> --- This is the first commit where it doesn't ICE. I reverted it from master, and it did start ICEing again. commit r14-5001-g8111b5c23bd14f Author: Haochen Gui <guih...@gcc.gnu.org> Date: Mon Oct 30 10:59:51 2023 +0800 Expand: Checking available optabs for scalar modes in by pieces operations The former patch (f08ca5903c7) examines the scalar modes by target hook scalar_mode_supported_p. It causes some i386 regression cases as XImode and OImode are not enabled in i386 target function. This patch examines the scalar mode by checking if the corresponding optabs are available for the mode. gcc/ PR target/111449 * expr.cc (qi_vector_mode_supported_p): Rename to... (by_pieces_mode_supported_p): ...this, and extends it to do the checking for both scalar and vector mode. (widest_fixed_size_mode_for_size): Call by_pieces_mode_supported_p to examine the mode. (op_by_pieces_d::smallest_fixed_size_mode_for_size): Likewise. gcc/expr.cc | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-)