[Bug c/96130] New: 10.1.1: segfault during IPA pass: fnsummary

[manuel.lauss at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96130

            Bug ID: 96130
           Summary: 10.1.1: segfault during IPA pass: fnsummary
           Product: gcc
           Version: 10.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: manuel.lauss at googlemail dot com
  Target Milestone: ---

Created attachment 48847
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48847&action=edit
preprocessed unreduced testcase

The testcase, extracted from current mesa, segfaults with -O1 or higher:

# gcc -O1 -c sp_tex_sample.i
during IPA pass: fnsummary
../mesa-9999/src/gallium/drivers/softpipe/sp_tex_sample.c: In function
'sample_compare':
../mesa-9999/src/gallium/drivers/softpipe/sp_tex_sample.c:3862:1: internal
compiler error: Segmentation fault
 3862 | }
      | ^
Please submit a full bug report,
with preprocessed source if appropriate.

# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/10.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/tmp-ram/portage/sys-devel/gcc-10.1.0-r1/work/gcc-10.1.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/10.1.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.1.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.1.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.1.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/include/g++-v10
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/10.1.0/python
--enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror
--with-system-zlib --disable-nls --enable-checking=release
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 10.1.0-r1 p2'
--disable-esp --enable-libstdcxx-time --with-build-config=bootstrap-lto
--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-libmudflap --disable-libssp --disable-libada --disable-systemtap
--disable-vtable-verify --disable-libvtv --without-zstd --disable-libquadmath
--enable-lto --with-isl --disable-isl-version-check --disable-libsanitizer
--disable-default-pie --disable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.1.0 (Gentoo 10.1.0-r1 p2)