[Bug optimization/9805] optimisation of largish array constant containing strings takes forever(?) and consumes very large amounts of memory

["joost at lumatec dot be" <gcc-bugzilla at gcc dot gnu dot org>]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9805



------- Additional Comments From joost at lumatec dot be  2003-08-02 06:39 -------
I have a simular problem with my program, both with gcc-3.2 and gcc-3.3. 
If I compile with -O0 it works fine. 
If I compile with -O1 or higher it takes almost forever. 
 
With -O0 with gcc-3.3 it takes 12 seconds on my PIII 800. 
With -O1 with gcc-3.3 it takes 12 minutes! 
With -O2 with gcc-3.3 it takes 24 minutes! 
 
I have a large (+-350 entries) array of structs: 
 
        struct SCCPreset 
        { 
                char* name; 
                signed char shape[32]; 
        }; 
 
which I initialize with generated code like this: 
 
presets[236].name="Random Wave Form"; 
presets[236].shape[0]=-128; 
presets[236].shape[1]=-56; 
presets[236].shape[2]=32; 
presets[236].shape[3]=127; 
presets[236].shape[4]=48; 
presets[236].shape[5]=-56; 
presets[236].shape[6]=-128; 
presets[236].shape[7]=-112; 
presets[236].shape[8]=-88; 
presets[236].shape[9]=-64; 
presets[236].shape[10]=-32; 
presets[236].shape[11]=0; 
presets[236].shape[12]=32; 
presets[236].shape[13]=56; 
presets[236].shape[14]=80; 
presets[236].shape[15]=96; 
presets[236].shape[16]=112; 
presets[236].shape[17]=120; 
presets[236].shape[18]=124; 
presets[236].shape[19]=127; 
presets[236].shape[20]=124; 
presets[236].shape[21]=120; 
presets[236].shape[22]=112; 
presets[236].shape[23]=96; 
presets[236].shape[24]=80; 
presets[236].shape[25]=56; 
presets[236].shape[26]=32; 
presets[236].shape[27]=0; 
presets[236].shape[28]=-32; 
presets[236].shape[29]=-64; 
presets[236].shape[30]=-88; 
presets[236].shape[31]=-112; 
 
gcc specs: 
gcc -v 
Reading specs from /usr/lib/gcc-lib/i386-linux/3.3.1/specs 
Configured with: ../src/configure -v 
--enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr 
--mandir=/usr/share/man --infodir=/usr/share/info 
--with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared --with-system-zlib 
--enable-nls --without-included-gettext --enable-__cxa_atexit 
--enable-clocale=gnu --enable-debug --enable-java-gc=boehm 
--enable-java-awt=xlib --enable-objc-gc i386-linux 
Thread model: posix 
gcc version 3.3.1 20030728 (Debian prerelease) 
 
and: 
 
gcc-3.2 -v 
Reading specs from /usr/lib/gcc-lib/i386-linux/3.2.3/specs 
Configured with: ../src/configure -v --enable-languages=c,c++,f77,objc,ada 
--prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info 
--with-gxx-include-dir=/usr/include/c++/3.2 --enable-shared --with-system-zlib 
--enable-nls --without-included-gettext --enable-__cxa_atexit 
--enable-clocale=gnu --enable-objc-gc i386-linux 
Thread model: posix 
gcc version 3.2.3 (Debian) 
 
If needed I can provide you with my sample program. 
 
Thanks, Joost Damad