https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94224
Bug ID: 94224
Summary: [10 Regression] ICE: SIGSEGV in output_merged_store
(gimple-ssa-store-merging.c:4304) with -O2
-fnon-call-exceptions testcase.C
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Created attachment 48065
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48065&action=edit
reduced testcase (from OpenTTD sources)
Compiler output:
$ x86_64-pc-linux-gnu-g++ -O2 -fnon-call-exceptions testcase.C -wrapper
valgrind,-q
testcase.C: In function 'int operatorX(int&)':
testcase.C:7:1: warning: no return statement in function returning non-void
[-Wreturn-type]
7 | }
| ^
==21839== Invalid read of size 4
==21839== at 0x1C09F4A: (anonymous
namespace)::imm_store_chain_info::output_merged_store((anonymous
namespace)::merged_store_group*) (gimple-ssa-store-merging.c:4304)
==21839== by 0x1C0C7AA: output_merged_stores
(gimple-ssa-store-merging.c:4360)
==21839== by 0x1C0C7AA: terminate_and_process_chain
(gimple-ssa-store-merging.c:4404)
==21839== by 0x1C0C7AA: (anonymous
namespace)::pass_store_merging::terminate_and_process_chain((anonymous
namespace)::imm_store_chain_info*) (gimple-ssa-store-merging.c:2206)
==21839== by 0x1C0DD3F: terminate_and_process_all_chains
(gimple-ssa-store-merging.c:2141)
==21839== by 0x1C0DD3F: (anonymous
namespace)::pass_store_merging::execute(function*)
(gimple-ssa-store-merging.c:4950)
==21839== by 0x11447A7: execute_one_pass(opt_pass*) (passes.c:2502)
==21839== by 0x114511F: execute_pass_list_1(opt_pass*) (passes.c:2590)
==21839== by 0x1145131: execute_pass_list_1(opt_pass*) (passes.c:2591)
==21839== by 0x1145158: execute_pass_list(function*, opt_pass*)
(passes.c:2601)
==21839== by 0xDAB6DB: cgraph_node::expand() (cgraphunit.c:2292)
==21839== by 0xDAC8AF: expand_all_functions (cgraphunit.c:2463)
==21839== by 0xDAC8AF: symbol_table::compile() [clone .part.0]
(cgraphunit.c:2813)
==21839== by 0xDAEBAC: compile (cgraphunit.c:2726)
==21839== by 0xDAEBAC: symbol_table::finalize_compilation_unit()
(cgraphunit.c:2993)
==21839== by 0x123052E: compile_file() (toplev.c:483)
==21839== by 0xA7E6B7: do_compile (toplev.c:2273)
==21839== by 0xA7E6B7: toplev::main(int, char**) (toplev.c:2412)
==21839== Address 0x24 is not stack'd, malloc'd or (recently) free'd
==21839==
during GIMPLE pass: store-merging
testcase.C: In function 'void x()':
testcase.C:40:1: internal compiler error: Segmentation fault
40 | x ()
| ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
The original testcase didn't have the missing return statement; adding it
prevents the ICE in the reduced testcase.
$ x86_64-pc-linux-gnu-g++ -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-g++
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r10-7276-20200319122247-g02f7334ac93-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/10.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r10-7276-20200319122247-g02f7334ac93-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200319 (experimental) (GCC)
