I have a project where g++ crashes on most files whenever -fschedule-insns is mentioned; i've attached one such file.
$ g++ -O1 -std=c++0x -fschedule-insns drv.ii -c src.core/driver.cc: In member function ui::events::flags_and_signals_t ui::<unnamed>::window_private_t::process(ui::events::fixed_queue_t&, bool): src.core/driver.cc:1078: error: unable to find a register to spill in class CREG src.core/driver.cc:1078: error: this is the insn: (insn 339 462 335 31 src.core/driver.cc:955 (parallel [ (set (reg:DI 6 bp [237]) (ashift:DI (reg:DI 6 bp [238]) (subreg:QI (reg:SI 1 dx [230]) 0))) (clobber (reg:CC 17 flags)) ]) 490 {*ashldi3_1_rex64} (expr_list:REG_DEAD (reg:DI 6 bp [238]) (expr_list:REG_DEAD (reg:SI 1 dx [230]) (expr_list:REG_UNUSED (reg:CC 17 flags) (nil))))) src.core/driver.cc:1078: confused by earlier errors, bailing out Preprocessed source stored into /tmp/ccsQpKys.out file, please attach this to your bugreport. $ g++ -v Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.3-4ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i486 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) also happens on another machine with Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 4.4.4-8' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --with-arch-32=i586 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.4.5 20100728 (prerelease) (Debian 4.4.4-8) -- Summary: ICE, g++ 4.4.x, -fschedule-insns, unable to find a register to spill in class '*REG' Product: gcc Version: 4.4.4 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tbptbp at gmail dot com GCC host triplet: x86-64, linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45409