[Bug c/36862] Optimization O2 causes infinite loop

["ben at zeus dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from ben at zeus dot com  2008-07-17 09:53 -------
Sorry, forgot to include any compiler details:

[hera ben]$ /usr/local/gcc-4.3/bin/gcc -O2 -v -save-temps loop.c                

Using built-in specs.

Target: i686-pc-linux-gnu

Configured with: ../gcc-4.3.1/configure --prefix=/usr/local/gcc-4.3.1
--with-gmp=/usr/local/gmp-4.2.2 --with-mpfr=/usr/local/mpfr-2.3.1 :
(reconfigured) ../gcc-4.3.1/configure --prefix=/usr/local/gcc-4.3.1
--with-gmp=/usr/local/gmp-4.2.2 --with-mpfr=/usr/local/mpfr-2.3.1

Thread model: posix

gcc version 4.3.1 (GCC) 

COLLECT_GCC_OPTIONS='-O2' '-v' '-save-temps' '-mtune=generic'

 /usr/local/gcc-4.3.1/libexec/gcc/i686-pc-linux-gnu/4.3.1/cc1 -E -quiet -v
loop.c -mtune=generic -O2 -fpch-preprocess -o loop.i

ignoring nonexistent directory
"/usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1/../../../../i686-pc-linux-gnu/include"

#include "..." search starts here:

#include <...> search starts here:

 /usr/local/include

 /usr/local/gcc-4.3.1/include

 /usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1/include

 /usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1/include-fixed

 /usr/include

End of search list.

COLLECT_GCC_OPTIONS='-O2' '-v' '-save-temps' '-mtune=generic'

 /usr/local/gcc-4.3.1/libexec/gcc/i686-pc-linux-gnu/4.3.1/cc1 -fpreprocessed
loop.i -quiet -dumpbase loop.c -mtune=generic -auxbase loop -O2 -version -o
loop.s

GNU C (GCC) version 4.3.1 (i686-pc-linux-gnu)

        compiled by GNU C version 4.3.1, GMP version 4.2.2, MPFR version 2.3.1.

GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=64563

Compiler executable checksum: 93e4b24a169a3647e9429593228b6881

COLLECT_GCC_OPTIONS='-O2' '-v' '-save-temps' '-mtune=generic'

 as -V -Qy -o loop.o loop.s

GNU assembler version 2.15 (i386-linux) using BFD version 2.15

COMPILER_PATH=/usr/local/gcc-4.3.1/libexec/gcc/i686-pc-linux-gnu/4.3.1/:/usr/local/gcc-4.3.1/libexec/gcc/i686-pc-linux-gnu/4.3.1/:/usr/local/gcc-4.3.1/libexec/gcc/i686-pc-linux-gnu/:/usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1/:/usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/

LIBRARY_PATH=/usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1/:/usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1/../../../:/lib/:/usr/lib/

COLLECT_GCC_OPTIONS='-O2' '-v' '-save-temps' '-mtune=generic'

 /usr/local/gcc-4.3.1/libexec/gcc/i686-pc-linux-gnu/4.3.1/collect2
--eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 /usr/lib/crt1.o
/usr/lib/crti.o /usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1/crtbegin.o
-L/usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1
-L/usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1/../../.. loop.o -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/local/gcc-4.3.1/lib/gcc/i686-pc-linux-gnu/4.3.1/crtend.o /usr/lib/crtn.o


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36862