O3 bug on IRIX (20001024)

[jarausch at igpm dot rwth-aachen dot de]

Hi,
compiling current gdb-cvs sources
I get a floating point error(!) within the compiler
if I compile the file tracepoint.c with -O3
I have attached the fully preprocessed tracepoint.c

gcc -v gives
Reading specs from /usr/LOCAL/lib/gcc-lib/mips-sgi-irix6.5/2.97/specs
Configured with:  --with-gcc-version-trigger=/usr/people/jarausch/ZIP/EGCS/gcc-cvs/gcc/version.c --host=mips-sgi-irix6.5 --prefix=/usr/LOCAL --with-local-prefix=/usr/LOCAL --enable-haifa --enable-cpp --enable-c-cpplib --norecursion
gcc version 2.97 20001024 (experimental)


Invocation and error message:
gcc -c -O3    -I. -I/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb -I/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/config -DHAVE_CONFIG_H -I/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/../include/opcode -I/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/../readline/.. -I../bfd -I/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/../bfd  -I/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/../include -I../intl -I/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/../intl  -Wimplicit -Wreturn-type -Wcomment -Wtrigraphs -Wformat -Wparentheses -Wpointer-arith -Wuninitialized  /usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/tracepoint.c
/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/tracepoint.c: In function `map_args_over_tracepoints':
/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/tracepoint.c:597: warning: `tpnum' might be used uninitialized in this function
/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/tracepoint.c: In function `trace_pass_command':
/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/tracepoint.c:597: warning: `tpnum' might be used uninitialized in this function
/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/tracepoint.c: In function `stringify_collection_list':
/usr/people/jarausch/ZIP/GNU/gdb-cvs/gdb/tracepoint.c:1442: Internal error: Floating point exception.
   Please submit a full bug report.

Reducing the optimization to -O seems to work fine.

Thanks for looking into it.

Helmut Jarausch
Lehrstuhl fuer Numerische Mathematik
Institute of Technology, RWTH Aachen
D 52056 Aachen, Germany

fully preprocessed tracepoint.c from gdb_cvs