[Bug c++/50474] GCC (cc1plus) hangs forever compiling with -O2 (-fcse-follow-jumps)

[steffen-schmidt at siemens dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50474

--- Comment #2 from Steffen Schmidt <steffen-schmidt at siemens dot com> 2011-09-26 09:04:33 UTC ---
I'm very sorry for the inconvenience, but this bug is not directly related to
any CodeSourcery built GCC toolchain. It was a pure coincedence using such a
toolchain.

I am able to reproduce the effect with toolchain GCC 4.6.0 for MIPS built from
source using MinGW:

Target: mips-siemens-elf
Configured with: ../../gcc-4.6.0/configure --enable-languages=c,c++
--with-arch=mips32r2 -enable-poison-system-directories --enable-interwork
--enable-multilib --enable-sgxx-sde-multilibs --with-gcc --with-gnu-ld
--with-gnu-as --with-stabs --disable-libmudflap --disable-libssp
--disable-shared --disable-threads --disable-libgomp --disable-win32-registry
--disable-nls --target=mips-siemens-elf --with-newlib
--with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm'
--prefix=/build_mips_4.6.0_cloog/cross-gcc/mips-siemens-elf
--with-gmp=/build_mips_4.6.0_cloog/host
--with-mpfr=/build_mips_4.6.0_cloog/host
--with-mpc=/build_mips_4.6.0_cloog/host --with-ppl=/build_mips_4.6.0_cloog/host
--with-cloog=/build_mips_4.6.0_cloog/host
--with-sysroot=/build_mips_4.6.0_cloog/cross-gcc/mips-siemens-elf
Thread model: single
gcc version 4.6.0 (GCC)

The behaviour seems to be related to the code line
if(r != !!r)

When replacing the condition with the equivalent
if(r != 0 && r != 1)

everything seems fine.

Is it worth investigating the issue further and re-open it?