https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121338
Bug ID: 121338
Summary: UBSAN error in ivopts (signed integer overflow:
9223372036854775805 + 26 cannot be represented in type
'long int')
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Blocks: 63426
Target Milestone: ---
```
$ gfortran ./BLAS/SRC/CMakeFiles/blas_64_obj.dir/blas_64_obj/zher2k.f.fi -O3
-fdefault-integer-8
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:4217:20:
runtime error: signed integer overflow: 9223372036854775805 + 26 cannot be
represented in type 'long int'
#0 0x563d6e45531c in adjust_setup_cost
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:4217
#1 0x563d6e48dadf in get_address_cost
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:4779
#2 0x563d6e48dadf in get_computation_cost
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:4890
#3 0x563d6e48f16c in determine_group_iv_cost_address
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:5004
#4 0x563d6e48f16c in determine_group_iv_cost
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:5622
#5 0x563d6e495145 in determine_group_iv_costs
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:5881
#6 0x563d6e49f80b in tree_ssa_iv_optimize_loop
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:8175
#7 0x563d6e49f80b in tree_ssa_iv_optimize()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:8224
#8 0x563d6e54b1d6 in execute
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop.cc:459
#9 0x563d6d6958b0 in execute_one_pass(opt_pass*)
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/passes.cc:2648
#10 0x563d6d698730 in execute_pass_list_1
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/passes.cc:2757
#11 0x563d6d698777 in execute_pass_list_1
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/passes.cc:2758
#12 0x563d6d698777 in execute_pass_list_1
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/passes.cc:2758
#13 0x563d6d69883c in execute_pass_list(function*, opt_pass*)
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/passes.cc:2768
#14 0x563d6c2ac76e in cgraph_node::expand()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/cgraphunit.cc:1859
#15 0x563d6c2ac76e in cgraph_node::expand()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/cgraphunit.cc:1812
#16 0x563d6c2be4cd in expand_all_functions
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/cgraphunit.cc:2042
#17 0x563d6c2be4cd in symbol_table::compile()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/cgraphunit.cc:2419
#18 0x563d6c2bf290 in symbol_table::compile()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/cgraphunit.cc:2329
#19 0x563d6c2bf290 in symbol_table::finalize_compilation_unit()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/cgraphunit.cc:2608
#20 0x563d6dcf7660 in compile_file
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/toplev.cc:480
#21 0x563d6b6ee784 in do_compile
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/toplev.cc:2220
#22 0x563d6b6ee784 in toplev::main(int, char**)
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/toplev.cc:2383
#23 0x563d6b6f2014 in main
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/main.cc:39
#24 0x7f695b2277ca (/usr/lib64/libc.so.6+0x277ca)
#25 0x7f695b227879 in __libc_start_main (/usr/lib64/libc.so.6+0x27879)
#26 0x563d6b6f2554 in _start
(/usr/libexec/gcc/x86_64-pc-linux-gnu/16/f951+0x7671554)
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:4217:20
during GIMPLE pass: ivopts
/var/tmp/portage/sci-libs/lapack-3.12.1/work/lapack-3.12.1_build/BLAS/SRC/blas_64_obj/zher2k.f:197:7:
197 | SUBROUTINE ZHER2K(UPLO,TRANS,N,K,ALPHA,A,LDA,B,LDB,BETA,C,LDC)
| ^~~~~~~~~~~~~~~~~
internal compiler error: Aborted
0x563d7365bfcf internal_error(char const*, ...)
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/diagnostic-global-context.cc:534
0x563d6dcf52a7 crash_signal
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/toplev.cc:323
0x563d6b6eaea4 __sanitizer::Abort()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp:163
0x563d73b06bab __sanitizer::Die()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libsanitizer/sanitizer_common/sanitizer_termination.cpp:58
0x563d73b077f6 __ubsan::ScopedReport::~ScopedReport()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libsanitizer/ubsan/ubsan_diag.cpp:402
0x563d73afc74e handleIntegerOverflowImpl<__ubsan::Value>
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libsanitizer/ubsan/ubsan_handlers.cpp:231
0x563d73b0057c __ubsan_handle_add_overflow
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/libsanitizer/ubsan/ubsan_handlers.cpp:242
0x563d6e45531c adjust_setup_cost
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:4217
0x563d6e48dadf get_address_cost
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:4779
0x563d6e48dadf get_computation_cost
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:4890
0x563d6e48f16c determine_group_iv_cost_address
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:5004
0x563d6e48f16c determine_group_iv_cost
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:5622
0x563d6e495145 determine_group_iv_costs
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:5881
0x563d6e49f80b tree_ssa_iv_optimize_loop
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:8175
0x563d6e49f80b tree_ssa_iv_optimize()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop-ivopts.cc:8224
0x563d6e54b1d6 execute
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-ssa-loop.cc:459
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
```
```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/16/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/16
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/16/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/16
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/16/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/16/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/16/include/g++-v16
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/16/python
--enable-libphobos --enable-objc-gc
--enable-languages=c,c++,d,objc,obj-c++,fortran,ada,rust --enable-obsolete
--enable-secureplt --disable-werror --with-system-zlib --enable-nls
--without-included-gettext --disable-libunwind-exceptions
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 16.0.9999 p, commit
8cda62318174b911a7cba57fcf70efd38f265f0e' --with-gcc-major-version-only
--enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--enable-multilib --with-multilib-list=m32,m64 --disable-fixed-point
--enable-targets=all --enable-offload-defaulted
--enable-offload-targets=nvptx-none --enable-libgomp --disable-libssp
--enable-libada --enable-cet --disable-systemtap --enable-valgrind-annotations
--disable-vtable-verify --disable-libvtv --with-zstd --without-isl
--enable-default-pie --enable-host-pie --enable-host-bind-now
--enable-default-ssp --disable-fixincludes
--with-gxx-libcxx-include-dir=/usr/include/c++/v1
--with-build-config='bootstrap-ubsan bootstrap-cet'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20250730 (experimental)
7aa9565a62ea2ce04e2ddf61e1932bc123374988 (Gentoo 16.0.9999 p, commit
8cda62318174b911a7cba57fcf70efd38f265f0e)
```
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426
[Bug 63426] [meta-bug] Issues found with -fsanitize=undefined
