https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113731
--- Comment #11 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Tamar Christina <tnfch...@gcc.gnu.org>: https://gcc.gnu.org/g:8f6ed71d8fff3c3c6249651a72aee084e31ffb9e commit r14-8839-g8f6ed71d8fff3c3c6249651a72aee084e31ffb9e Author: Tamar Christina <tamar.christ...@arm.com> Date: Wed Feb 7 10:58:25 2024 +0000 middle-end: fix ICE when moving statements to empty BB [PR113731] We use gsi_move_before (&stmt_gsi, &dest_gsi); to request that the new statement be placed before any other statement. Typically this then moves the current pointer to be after the statement we just inserted. However it looks like when the BB is empty, this does not happen and the CUR pointer stays NULL. There's a comment in the source of gsi_insert_before that explains: /* If CUR is NULL, we link at the end of the sequence (this case happens This adds a default parameter to gsi_move_before to allow us to control where the insertion happens. gcc/ChangeLog: PR tree-optimization/113731 * gimple-iterator.cc (gsi_move_before): Take new parameter for update method. * gimple-iterator.h (gsi_move_before): Default new param to GSI_SAME_STMT. * tree-vect-loop.cc (move_early_exit_stmts): Call gsi_move_before with GSI_NEW_STMT. gcc/testsuite/ChangeLog: PR tree-optimization/113731 * gcc.dg/vect/vect-early-break_111-pr113731.c: New test.
