https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97295
Bug ID: 97295
Summary: ICE on firefox built with lto+pgo:
dist/include/mozilla/Casting.h:64:1: internal compiler
error: in to_frequency, at profile-count.c:273
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at gcc dot gnu.org
Target Milestone: ---
It's an upstream report of downstream bug https://bugs.gentoo.org/746578 where
firefox-81.0 built with gcc-9.3.0 or gcc-10.2.0 ICEs on LTO+PGO build:
The crash happens somewhere in register allocator:
"""
$ LANG=C g++-10.2.0 -o TestFloatingPoint TestFloatingPoint.o
Unified_cpp_mfbt0.o -shared
during RTL pass: ira
/var/tmp/portage/www-client/firefox-81.0.1/work/firefox_build/dist/include/mozilla/Casting.h:
In function 'BitwiseCast':
/var/tmp/portage/www-client/firefox-81.0.1/work/firefox_build/dist/include/mozilla/Casting.h:64:1:
internal compiler error: in to_frequency, at profile-count.c:273
0x5b0db1 profile_count::to_frequency(function*) const
/usr/src/debug/sys-devel/gcc-10.2.0-r2/gcc-10.2.0/gcc/profile-count.c:273
0x9edea9 regstat_bb_compute_ri
/usr/src/debug/sys-devel/gcc-10.2.0-r2/gcc-10.2.0/gcc/regstat.c:200
0x9edea9 regstat_compute_ri()
/usr/src/debug/sys-devel/gcc-10.2.0-r2/gcc-10.2.0/gcc/regstat.c:253
0x8a5958 ira
/usr/src/debug/sys-devel/gcc-10.2.0-r2/gcc-10.2.0/gcc/ira.c:5294
0x8a5958 execute
/usr/src/debug/sys-devel/gcc-10.2.0-r2/gcc-10.2.0/gcc/ira.c:5666
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
lto-wrapper: fatal error: /usr/bin/g++-10.2.0 returned 1 exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: lto-wrapper failed
collect2: error: ld returned 1 exit status
"""
$ LANG=C g++-10.2.0 -v
Using built-in specs.
COLLECT_GCC=/usr/bin/g++-10.2.0
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-10.2.0-r2/work/gcc-10.2.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/10.2.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/python
--enable-languages=c,c++,go,jit,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 10.2.0-r2 p3' --disable-esp --enable-libstdcxx-time
--enable-host-shared --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-libgomp --disable-libssp --disable-libada --disable-systemtap
--enable-vtable-verify --without-zstd --enable-lto --with-isl
--disable-isl-version-check --enable-default-pie --enable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (Gentoo 10.2.0-r2 p3)
