https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69123
Bug ID: 69123
Summary: [6 Regression] --with-build-config='bootstrap-O3
bootstrap-debug' miscompiled stage 2
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
On x86-64, --with-build-config='bootstrap-O3 bootstrap-debug' miscompiled
stage 2 into an infinite loop:
(gdb) bt
#0 0x0000000000e01141 in get_ref_base_and_extent(tree_node*, long*, long*,
long*, bool*) ()
#1 0x0000000000ebb061 in ao_ref_base(ao_ref*) ()
#2 0x00000000008db7b2 in ao_ref_from_mem(ao_ref*, rtx_def const*) ()
#3 0x00000000008dbd2d in rtx_refs_may_alias_p(rtx_def const*, rtx_def const*,
bool) ()
#4 0x00000000008e001a in true_dependence_1(rtx_def const*, machine_mode,
rtx_def*, rtx_def const*, rtx_def*, bool) ()
#5 0x0000000001094a6d in drop_overlapping_mem_locs(variable**,
overlapping_mems*) ()
#6 0x0000000001094bd9 in clobber_overlapping_mems(dataflow_set*, rtx_def*) ()
#7 0x0000000001099bf3 in val_store(dataflow_set*, rtx_def*, rtx_def*,
rtx_insn*, bool) ()
#8 0x000000000109e086 in compute_bb_dataflow(basic_block_def*) [clone
.isra.135] ()
#9 0x000000000109f4ca in vt_find_locations() ()
#10 0x00000000010a15e0 in variable_tracking_main_1() ()
#11 0x00000000010a178c in (anonymous
namespace)::pass_variable_tracking::execute(function*) ()
#12 0x0000000000cb7d74 in execute_one_pass(opt_pass*) ()
#13 0x0000000000cb8a55 in execute_pass_list_1(opt_pass*) ()
#14 0x0000000000cb8cea in execute_pass_list(function*, opt_pass*) ()
#15 0x0000000000964254 in cgraph_node::expand() ()
---Type <return> to continue, or q <return> to quit---
#16 0x0000000000965c07 in symbol_table::compile() [clone .part.49] ()
#17 0x0000000000968293 in symbol_table::finalize_compilation_unit() ()
#18 0x0000000000dad023 in compile_file() ()
#19 0x00000000005d2186 in toplev::main(int, char**) ()
#20 0x00000000005d3db7 in main ()
(gdb)
