[Bug c/29968] integer division by zero with optimization

["tiamat at komi dot mts dot ru" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #1 from tiamat at komi dot mts dot ru  2006-11-24 10:31 -------
Created an attachment (id=12681)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12681&action=view)
preprocessed file test.i

$ gcc -v -save-temps -O3 test.c
Using built-in specs.
Target: sparc-linux-gnu
Configured with: ../src/configure -v
--enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu
--enable-libstdcxx-debug --enable-mpfr --with-cpu=v8 --with-long-double-128
--enable-checking=release sparc-linux-gnu
Thread model: posix
gcc version 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5)
 /usr/lib/gcc/sparc-linux-gnu/4.1.2/cc1 -E -quiet -v -D__sparc_v8__ test.c
-mcpu=v8 -O3 -fpch-preprocess -o test.i
ignoring nonexistent directory "/usr/local/include/sparc-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/sparc-linux-gnu/4.1.2/../../../../sparc-linux-gnu/include"
ignoring nonexistent directory "/usr/include/sparc-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/lib/gcc/sparc-linux-gnu/4.1.2/include
 /usr/include
End of search list.
 /usr/lib/gcc/sparc-linux-gnu/4.1.2/cc1 -fpreprocessed test.i -quiet -dumpbase
test.c -mcpu=v8 -auxbase test -O3 -version -fstack-protector -fstack-protector
-o test.s
GNU C version 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5)
(sparc-linux-gnu)
        compiled by GNU C version 4.1.2 20060928 (prerelease) (Ubuntu
4.1.1-13ubuntu5).
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 98658b34ad66a745f736bec357f1c193
 as -V -Qy -s -32 -relax -o test.o test.s
GNU assembler version 2.17 (sparc-linux-gnu) using BFD version 2.17 Debian
GNU/Linux
 /usr/lib/gcc/sparc-linux-gnu/4.1.2/collect2 --eh-frame-hdr -m elf32_sparc -Y
P,/usr/lib -dynamic-linker /lib/ld-linux.so.2 -relax
/usr/lib/gcc/sparc-linux-gnu/4.1.2/../../../../lib/crt1.o
/usr/lib/gcc/sparc-linux-gnu/4.1.2/../../../../lib/crti.o
/usr/lib/gcc/sparc-linux-gnu/4.1.2/crtbeginS.o
-L/usr/lib/gcc/sparc-linux-gnu/4.1.2 -L/usr/lib/gcc/sparc-linux-gnu/4.1.2
-L/usr/lib/gcc/sparc-linux-gnu/4.1.2/../../../../lib -L/lib/../lib
-L/usr/lib/../lib test.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc
--as-needed -lgcc_s --no-as-needed /usr/lib/gcc/sparc-linux-gnu/4.1.2/crtend.o
/usr/lib/gcc/sparc-linux-gnu/4.1.2/../../../../lib/crtn.o


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29968