gcc -O2 works on this file: gcc whetstone.cbe.c -lm -O2 -fno-strict-aliasing -fno-inline -m64 -fomit-frame-pointer
gcc -O3 exhausts memory: gcc whetstone.cbe.c -lm -O3 -fno-strict-aliasing -fno-inline -m64 -fomit-frame-pointer virtual memory exhausted: Cannot allocate memory $ gcc -v Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 4.4.3-3' --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=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 (Debian 4.4.3-3) $ uname -a Linux debian 2.6.33-00175-g2d1299a0 #10 SMP PREEMPT Mon Mar 15 15:42:54 EET 2010 x86_64 GNU/Linux The system has plenty of memory (4G of RAM + even more swap) $ free total used free shared buffers cached Mem: 3980032 1392288 2587744 0 20492 569508 -/+ buffers/cache: 802288 3177744 Swap: 5863704 777788 5085916 -- Summary: gcc -O3: exhausts memory on whetstone.cbe. Product: gcc Version: 4.4.3 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: edwintorok at gmail dot com GCC build triplet: x86_64-linux-gnu GCC host triplet: x86_64-linux-gnu GCC target triplet: x86_64-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43472