http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47555
Summary: Huge memory usage when optimizing
Product: gcc
Version: 4.4.5
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: matthijs.do...@inria.fr
Created attachment 23186
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23186
code that triggers the bug
Hello,
The attached code contains manually unrolled loops. When compiling it with
cc -c bug2.c -O2
the memory usage of the cc1 process grows above 3.5 GB (before killing it).
cc -v gives:
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.4.5-8'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.4 --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 --libdir=/usr/lib --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 (Debian 4.4.5-8)
The bug does appear with cc -O2, cc -O3, not with cc -O1. gcc 4.3.2 also uses a
lot of memory but manages to compile it in the end.
Thanks
