https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120080
Bug ID: 120080
Summary: [16 regression] ICE when building llvm-20.1.3
(find_bit_tests, at tree-switch-conversion.cc:1799)
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Created attachment 61279
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61279&action=edit
NVPTXInstPrinter.cpp.ii.xz
```
FAILED: [code=1]
lib/Target/NVPTX/MCTargetDesc/CMakeFiles/LLVMNVPTXDesc.dir/NVPTXInstPrinter.cpp.o
/usr/bin/x86_64-pc-linux-gnu-g++ -m32 -mfpmath=sse -DLLVM_EXPORTS
-D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -D_LARGEFILE_SOURCE
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-I/var/tmp/portage.notmp/portage/llvm-core/llvm-20.1.3/work/llvm_build-abi_x86_32.x86/lib/Target/NVPTX/MCTargetDesc
-I/var/tmp/portage.notmp/portage/llvm-core/llvm-20.1.3/work/llvm/lib/Target/NVPTX/MCTargetDesc
-I/var/tmp/portage.notmp/portage/llvm-core/llvm-20.1.3/work/llvm/lib/Target/NVPTX
-I/var/tmp/portage.notmp/portage/llvm-core/llvm-20.1.3/work/llvm_build-abi_x86_32.x86/lib/Target/NVPTX
-I/var/tmp/portage.notmp/portage/llvm-core/llvm-20.1.3/work/llvm_build-abi_x86_32.x86/include
-I/var/tmp/portage.notmp/portage/llvm-core/llvm-20.1.3/work/llvm/include
-DNDEBUG -O3 -march=native -mtls-dialect=gnu2 -fno-semantic-interposition -g1
-pipe -fcf-protection=none -fdiagnostics-color=always -fdiagnostics-urls=never
-frecord-gcc-switches -fdiagnostics-details
-fdiagnostics-set-output=text:experimental-nesting=yes -Wa,-O2
-Wa,-mtune=znver2 -Warray-bounds --param=ggc-min-expand=120 -Wstrict-aliasing
-Wfree-nonheap-object -Wuninitialized -Wmaybe-uninitialized -Wreturn-type
-fno-lto -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden
-Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter
-Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic
-Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-nonnull
-Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move
-Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment
-Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color
-ffunction-sections -fdata-sections -std=c++17 -fvisibility=hidden
-fdiagnostics-color=always -MD -MT
lib/Target/NVPTX/MCTargetDesc/CMakeFiles/LLVMNVPTXDesc.dir/NVPTXInstPrinter.cpp.o
-MF
lib/Target/NVPTX/MCTargetDesc/CMakeFiles/LLVMNVPTXDesc.dir/NVPTXInstPrinter.cpp.o.d
-o
lib/Target/NVPTX/MCTargetDesc/CMakeFiles/LLVMNVPTXDesc.dir/NVPTXInstPrinter.cpp.o
-c
/var/tmp/portage.notmp/portage/llvm-core/llvm-20.1.3/work/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp
during GIMPLE pass: switchlower
/var/tmp/portage.notmp/portage/llvm-core/llvm-20.1.3/work/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp:
In member function ‘void llvm::NVPTXInstPrinter::printLdStCode(const
llvm::MCInst*, int, llvm::raw_ostream&, const char*)’:
/var/tmp/portage.notmp/portage/llvm-core/llvm-20.1.3/work/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp:231:6:
internal compiler error: in find_bit_tests, at tree-switch-conversion.cc:1799
231 | void NVPTXInstPrinter::printLdStCode(const MCInst *MI, int OpNum,
| ^~~~~~~~~~~~~~~~
0x5f7069a50263 internal_error(char const*, ...)
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/diagnostic-global-context.cc:517
0x5f7069a31b58 fancy_abort(char const*, int, char const*)
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/diagnostic.cc:1748
0x5f706881531f
tree_switch_conversion::bit_test_cluster::find_bit_tests(vec<tree_switch_conversion::cluster*,
va_heap, vl_ptr>&, int)
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-switch-conversion.cc:1799
0x5f706881531f
tree_switch_conversion::bit_test_cluster::find_bit_tests(vec<tree_switch_conversion::cluster*,
va_heap, vl_ptr>&, int)
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-switch-conversion.cc:1781
0x5f706a37b05c
tree_switch_conversion::switch_decision_tree::analyze_switch_statement()
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-switch-conversion.cc:2261
0x5f706a120fb7 execute
/usr/src/debug/sys-devel/gcc-16.0.9999/gcc-16.0.9999/gcc/tree-switch-conversion.cc:3060
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,cobol,m2,rust
--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 16.0.9999 p, commit
93f36c1b921e531fd4cdc6aee7af55e1d6eb9d39' --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 --disable-cet --disable-systemtap --enable-valgrind-annotations
--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
--with-build-config='bootstrap-O3 bootstrap-lto'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20250502 (experimental)
dba5d112691a3e10b722468d94fffeda0fdbb818 (Gentoo Hardened 16.0.9999 p, commit
93f36c1b921e531fd4cdc6aee7af55e1d6eb9d39)
```
