The following fails on aarch64: ./xgcc -B . -c ~/toolchain/src/gcc/gcc/testsuite/gcc.c-torture/execute/20150611-1.c -S -o /dev/null -O3 during GIMPLE pass: vect /home/alecop01/toolchain/src/gcc/gcc/testsuite/gcc.c-torture/execute/20150611-1.c: In function ‘main’: /home/alecop01/toolchain/src/gcc/gcc/testsuite/gcc.c-torture/execute/20150611-1.c:5:1: internal compiler error: Segmentation fault 5 | main () | ^~~~ 0x30bdd30 crash_signal /home/alecop01/toolchain/src/gcc/gcc/toplev.cc:317 0x7f38d1b6708f ??? /build/glibc-wuryBv/glibc-2.31/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0 0x26e6cf6 gimple_phi_result(gphi const*) /home/alecop01/toolchain/src/gcc/gcc/gimple.h:4608 0x34b7f10 slpeel_tree_duplicate_loop_to_edge_cfg(loop*, edge_def*, loop*, edge_def*, edge_def*, edge_def**, bool, vec<basic_block_def*, va_heap, vl_ptr>*) /home/alecop01/toolchain/src/gcc/gcc/tree-vect-loop-manip.cc:1751 0x34bceea vect_do_peeling(_loop_vec_info*, tree_node*, tree_node*, tree_node**, tree_node**, tree_node**, int, bool, bool, tree_node**) /home/alecop01/toolchain/src/gcc/gcc/tree-vect-loop-manip.cc:3342 0x34a85f3 vect_transform_loop(_loop_vec_info*, gimple*) /home/alecop01/toolchain/src/gcc/gcc/tree-vect-loop.cc:11929 0x34fdcda vect_transform_loops /home/alecop01/toolchain/src/gcc/gcc/tree-vectorizer.cc:1006 0x34fe445 try_vectorize_loop_1 /home/alecop01/toolchain/src/gcc/gcc/tree-vectorizer.cc:1152 0x34fe57e try_vectorize_loop /home/alecop01/toolchain/src/gcc/gcc/tree-vectorizer.cc:1182 0x34fe844 execute /home/alecop01/toolchain/src/gcc/gcc/tree-vectorizer.cc:1298 Please submit a full bug report, with preprocessed source (by using -freport-bug). Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions.
Looks like it also caused the same ICE with AVX512 enabled: https://gcc.gnu.org/pipermail/gcc-patches/2024-January/643395.html
I'm testing a patch.
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>: https://gcc.gnu.org/g:6ce7008cfa1a240895ecca0898e7dbaecd975567 commit r14-8280-g6ce7008cfa1a240895ecca0898e7dbaecd975567 Author: Richard Biener <rguenther@suse.de> Date: Fri Jan 19 09:23:48 2024 +0100 tree-optimization/113494 - Fix two observed regressions with r14-8206 The following handles the situation where we lack a loop-closed PHI for a virtual operand because a loop exit goes to a code region not having any virtual use (an endless loop). It also handles the situation of edge redirection re-allocating a PHI node in the destination block so we have to re-lookup that before populating the new PHI argument. PR tree-optimization/113494 * tree-vect-loop-manip.cc (slpeel_tree_duplicate_loop_to_edge_cfg): Handle endless loop on exit. Handle re-allocated PHI.
Fixed.