https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78555
--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
markus@x4 ~ % cat real.ii
class A {
int N;
static const int D = 1 << 31;
int &m_fn1() const;
};
int &A::m_fn1() const { int a((double)N / D); }
markus@x4 ~ % UBSAN_OPTIONS=print_stacktrace=1
/var/tmp/gcc_ubsan/usr/local/bin/g++ -c -O2 real.ii
../../gcc/gcc/real.c:2890:25: runtime error: left shift of negative value -30
#0 0x21d4a5a in real_hash(real_value const*) ../../gcc/gcc/real.c:2890
#1 0x30050c1 in inchash::add_expr(tree_node const*, inchash::hash&,
unsigned int) ../../gcc/gcc/tree.c:7805
#2 0x2c03287 in vn_nary_op_compute_hash ../../gcc/gcc/tree-ssa-sccvn.c:2594
#3 0x2c16f02 in vn_nary_op_lookup_1 ../../gcc/gcc/tree-ssa-sccvn.c:2726
#4 0x2c1737b in vn_nary_op_lookup_stmt(gimple*, vn_nary_op_s**)
../../gcc/gcc/tree-ssa-sccvn.c:2783
#5 0x2c25e07 in visit_nary_op ../../gcc/gcc/tree-ssa-sccvn.c:3457
#6 0x2c25e07 in visit_use ../../gcc/gcc/tree-ssa-sccvn.c:3894
#7 0x2c2c278 in process_scc ../../gcc/gcc/tree-ssa-sccvn.c:4128
#8 0x2c2c278 in extract_and_process_scc_for_name
../../gcc/gcc/tree-ssa-sccvn.c:4215
#9 0x2c2c278 in DFS ../../gcc/gcc/tree-ssa-sccvn.c:4267
#10 0x2c2eaa8 in sccvn_dom_walker::before_dom_children(basic_block_def*)
../../gcc/gcc/tree-ssa-sccvn.c:4733
#11 0x3e69c15 in dom_walker::walk(basic_block_def*)
../../gcc/gcc/domwalk.c:265
#12 0x2c38155 in run_scc_vn(vn_lookup_kind)
../../gcc/gcc/tree-ssa-sccvn.c:4844
#13 0x2b63d54 in execute ../../gcc/gcc/tree-ssa-pre.c:5151
#14 0x210fc68 in execute_one_pass(opt_pass*) ../../gcc/gcc/passes.c:2370
#15 0x2111afb in execute_pass_list_1 ../../gcc/gcc/passes.c:2459
#16 0x2111b24 in execute_pass_list_1 ../../gcc/gcc/passes.c:2460
#17 0x2111bb4 in execute_pass_list(function*, opt_pass*)
../../gcc/gcc/passes.c:2470
#18 0x210c885 in do_per_function_toporder(void (*)(function*, void*),
void*) ../../gcc/gcc/passes.c:1729
#19 0x2113aef in execute_ipa_pass_list(opt_pass*)
../../gcc/gcc/passes.c:2812
#20 0x142e494 in ipa_passes ../../gcc/gcc/cgraphunit.c:2286
#21 0x142e494 in symbol_table::compile() ../../gcc/gcc/cgraphunit.c:2425
#22 0x1438457 in symbol_table::compile() ../../gcc/gcc/cgraphunit.c:2587
#23 0x1438457 in symbol_table::finalize_compilation_unit()
../../gcc/gcc/cgraphunit.c:2584
#24 0x24f39c0 in compile_file ../../gcc/gcc/toplev.c:488
#25 0x64bea4 in do_compile ../../gcc/gcc/toplev.c:1983
#26 0x64bea4 in toplev::main(int, char**) ../../gcc/gcc/toplev.c:2117
#27 0x64e4d6 in main ../../gcc/gcc/main.c:39
#28 0x7f7311ca0310 in __libc_start_main ../csu/libc-start.c:286
#29 0x64e8e9 in _start
(/var/tmp/gcc_ubsan/usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/cc1plus+0x64e8e9)
