[Bug tree-optimization/109473] [10 Regression] ICE during GIMPLE pass: vect: verify_gimple failed with -O1 -ftree-loop-vectorize since r10-4076-g82e8e335f917b9

["jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109473

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The testcase fails for me in gcc 11 on both x86_64-linux and i686-linux
(--enable-checking=yes,rtl,extra):
+FAIL: gcc.dg/vect/pr109473.c (internal compiler error)
+FAIL: gcc.dg/vect/pr109473.c (test for excess errors)
+FAIL: gcc.dg/vect/pr109473.c -flto -ffat-lto-objects (internal compiler error)
+FAIL: gcc.dg/vect/pr109473.c -flto -ffat-lto-objects (test for excess errors)
/usr/src/gcc-11/gcc/testsuite/gcc.dg/vect/pr109473.c:7:6: internal compiler
error: in build_vector_from_val, at tree.c:1970
0x7cd0c6 build_vector_from_val(tree_node*, tree_node*)
        ../../gcc/tree.c:1970
0xd77c26 gimple_build_vector_from_val(gimple**, unsigned int, tree_node*,
tree_node*)
        ../../gcc/gimple-fold.c:8719
0x12fc798 gimple_build_vector_from_val(gimple**, tree_node*, tree_node*)
        ../../gcc/gimple-fold.h:142
0x12fc798 get_initial_def_for_reduction
        ../../gcc/tree-vect-loop.c:4765
0x12fc798 vect_transform_cycle_phi(_loop_vec_info*, _stmt_vec_info*, gimple**,
_slp_tree*, _slp_instance*)
        ../../gcc/tree-vect-loop.c:7681
0x12ece28 vect_transform_stmt(vec_info*, _stmt_vec_info*,
gimple_stmt_iterator*, _slp_tree*, _slp_instance*)
        ../../gcc/tree-vect-stmts.c:11012
0x13053f5 vect_transform_loop(_loop_vec_info*, gimple*)
        ../../gcc/tree-vect-loop.c:9633
0x1336a3c try_vectorize_loop_1
        ../../gcc/tree-vectorizer.c:1104
0x13376a1 vectorize_loops()
        ../../gcc/tree-vectorizer.c:1243