[Bug target/71009] g++: ICE on modified gdb/valarith.c with -Ofast

["egall at gwmail dot gwu.edu" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71009

--- Comment #7 from Eric Gallager <egall at gwmail dot gwu.edu> ---
Created attachment 39089
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39089&action=edit
some compressed compiler output

Still happens with trunk from the end of July. I tried playing around with some
of the developer options to generate some dumpfiles, but there's too many of
them, and when I group them into folders, the archives are too big to upload
even after compressing them, so I'm not really sure what to upload, besides the
attached tempfiles.

Current version info:
$ /usr/local/bin/g++ -march=native -v
Using built-in specs.
COLLECT_GCC=/usr/local/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/i386-apple-darwin9.8.0/7.0.0/lto-wrapper
Target: i386-apple-darwin9.8.0
Configured with: ../configure --disable-werror
--enable-languages=c,c++,lto,objc,obj-c++ --enable-stage1-checking=release -C
--with-system-libunwind --enable-secureplt --enable-frame-pointer
--enable-debug --with-isl --enable-objc-gc --enable-host-shared
CC=/usr/local/bin/gcc CXX=/usr/local/bin/g++
Thread model: posix
gcc version 7.0.0 20160730 (experimental) (GCC)