https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120721
Bug ID: 120721
Summary: [16 regression] ICE when building llvm-20.1.7 on arm64
(instantiate_virtual_regs_in_insn, at
function.cc:1737)
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Created attachment 61667
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61667&action=edit
ScopedPrinter.cpp.ii.xz
Sorry about the bad backtrace. This environment seems to not have my usual
debug symbols setup, which I'll rectify now.
```
$ g++ -c ./lib/Support/CMakeFiles/LLVMSupport.dir/ScopedPrinter.cpp.ii -O2
-fno-vect-cost-model
during RTL pass: vregs
In file included from
/var/tmp/portage/llvm-core/llvm-20.1.7/work/llvm/lib/Support/ScopedPrinter.cpp:1:
/var/tmp/portage/llvm-core/llvm-20.1.7/work/llvm/include/llvm/Support/ScopedPrinter.h:
In member function ‘virtual void
llvm::JSONScopedPrinter::printBinaryImpl(llvm::StringRef, llvm::StringRef,
llvm::ArrayRef<unsigned char>, bool, uint32_t)’:
/var/tmp/portage/llvm-core/llvm-20.1.7/work/llvm/include/llvm/Support/ScopedPrinter.h:812:3:
internal compiler error: in instantiate_virtual_regs_in_insn, at
function.cc:1737
812 | }
| ^
0xaaaabf8e370b diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, std::__va_list*,
diagnostic_t)
???:0
0xaaaabf86224b internal_error(char const*, ...)
???:0
0xaaaabf86241f fancy_abort(char const*, int, char const*)
???:0
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/aarch64-unknown-linux-gnu/16/lto-wrapper
Target: aarch64-unknown-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/configure
--host=aarch64-unknown-linux-gnu --build=aarch64-unknown-linux-gnu
--prefix=/usr --bindir=/usr/aarch64-unknown-linux-gnu/gcc-bin/16
--includedir=/usr/lib/gcc/aarch64-unknown-linux-gnu/16/include
--datadir=/usr/share/gcc-data/aarch64-unknown-linux-gnu/16
--mandir=/usr/share/gcc-data/aarch64-unknown-linux-gnu/16/man
--infodir=/usr/share/gcc-data/aarch64-unknown-linux-gnu/16/info
--with-gxx-include-dir=/usr/lib/gcc/aarch64-unknown-linux-gnu/16/include/g++-v16
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/aarch64-unknown-linux-gnu/16/python
--enable-libphobos --enable-objc-gc
--enable-languages=c,c++,d,go,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=yes,extra,rtl --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 16.0.9999 p, commit
263a417f98b248f43e449689d3e04bf7dced1569' --with-gcc-major-version-only
--enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--disable-multilib --disable-fixed-point --enable-libgomp --disable-libssp
--enable-libada --disable-standard-branch-protection --disable-systemtap
--disable-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 20250619 (experimental)
1f2e4058e57c68b5ea91ab2bac469d5e57b6ff46 (Gentoo 16.0.9999 p, commit
263a417f98b248f43e449689d3e04bf7dced1569)
```
