https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127018
Bug ID: 127018
Summary: [17 regression] ICE when building warzone2100-4.7.0
(error: definition in block .. does not dominate use
in block ..)
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
Target Milestone: ---
```
$ g++ -c
./3rdparty/CMakeFiles/basis_transcoder.dir/basis_universal/transcoder/basisu_transcoder.cpp.ii
-march=znver2 -mshstk -O2
In file included from
/var/tmp/portage/games-strategy/warzone2100-4.7.0/work/warzone2100/3rdparty/basis_universal/transcoder/basisu_transcoder.cpp:21:
/var/tmp/portage/games-strategy/warzone2100-4.7.0/work/warzone2100/3rdparty/basis_universal/transcoder/basisu_astc_helpers.h:
In function ‘void astc_helpers::decode_endpoint(uint32_t, int (*)[2], const
uint8_t*)’:
/var/tmp/portage/games-strategy/warzone2100-4.7.0/work/warzone2100/3rdparty/basis_universal/transcoder/basisu_astc_helpers.h:1582:14:
error: definition in block 7 does not dominate use in block 46
1582 | void decode_endpoint(uint32_t cem_index, int (*pEndpoints)[2],
const uint8_t *pE)
| ^~~~~~~~~~~~~~~
for SSA_NAME: vect__1233.4049_1058 in statement:
vect_y0_293.4053_1053 = PHI <vect__1233.4049_1058(46),
vect_y0_599.4052_1054(47)>
PHI argument
vect__1233.4049_1058
for PHI node
vect_y0_293.4053_1053 = PHI <vect__1233.4049_1058(46),
vect_y0_599.4052_1054(47)>
during GIMPLE pass: slp
/var/tmp/portage/games-strategy/warzone2100-4.7.0/work/warzone2100/3rdparty/basis_universal/transcoder/basisu_astc_helpers.h:1582:14:
internal compiler error: verify_ssa failed
/usr/libexec/gcc/x86_64-pc-linux-gnu/17/cc1plus -fpreprocessed
./3rdparty/CMakeFiles/basis_transcoder.dir/basis_universal/transcoder/basisu_transcoder.cpp.ii
-quiet -dumpbase basisu_transcoder.cpp.ii -dumpbase-ext .ii -march=znver2
-mshstk -mtls-dialect=gnu2 -O2 -foffload-options=-fno-stack-protector -o
/tmp/ccvofg4k.s
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://bugs.gentoo.org/> for instructions.
```
```
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/17/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage.notmp/portage/sys-devel/gcc-17.0.9999/work/gcc-17.0.9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/17
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/17/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/17
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/17/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/17/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/17/include/g++-v17
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/17/python
--enable-libphobos --enable-objc-gc
--enable-languages=c,c++,d,objc,obj-c++,fortran,ada,algol68,m2,jit
--enable-obsolete --enable-secureplt --disable-werror --with-system-zlib
--enable-nls --without-included-gettext --disable-libunwind-exceptions
--enable-checking=yes,extra,rtl --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo Hardened 17.0.9999 p, commit
cb0bef329c3c99175a317e206f3e376f2fb6690d' --with-gcc-major-version-only
--enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch
--enable-linker-build-id --enable-libada --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --with-tls=gnu2 --enable-multilib
--with-multilib-list=m32,mx32,m64 --disable-fixed-point --with-abi=m64
--enable-targets=all --enable-offload-defaulted
--enable-offload-targets=nvptx-none --enable-libgomp --disable-libssp
--disable-cet --enable-systemtap --enable-valgrind-annotations
--enable-valgrind-interop --disable-vtable-verify --disable-libvtv --with-zstd
--with-isl --disable-isl-version-check --enable-default-pie --enable-host-pie
--enable-host-bind-now --enable-default-ssp --disable-fixincludes
--with-gxx-libcxx-include-dir=/usr/include/c++/v1 --enable-host-shared
--enable-libgdiagnostics --with-build-config='bootstrap-O3 bootstrap-lto'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 17.0.0 20260820 (experimental)
222f7f90191563a71dfbc710c8de950ace91c439 (Gentoo Hardened 17.0.9999 p, commit
cb0bef329c3c99175a317e206f3e376f2fb6690d)
```
