Re: c/8962: "-O2 -mmmx" makes gcc seg fault

["Mack Lobell" <macklobell at hotmail dot com>]

Ok,

more tests:

downloaded 3.3 branch and 3.4 current.

Results:

***** Build with 3.3 branch *****

$ ~/build/gcc3.3/gcc/xgcc.exe -B ~/build/gcc3.3/gcc -c -O2 -mmmx expr.i
/home/lobell/src/gcc-20021202/gcc/expr.c: In function `expand_expr':
/home/lobell/src/gcc-20021202/gcc/expr.c:9306: internal compiler error: 
Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

lobell@VOLVO ~/gcc_test
$ ~/build/gcc3.3/gcc/xgcc.exe -B ~/build/gcc3.3/gcc -v
Reading specs from /home/lobell/build/gcc3.3/gcc/specs
Configured with: /home/lobell/src/gcc3.3/gcc/configure --enable-languages=c 
--disable-nls
Thread model: single
gcc version 3.3 20021221 (prerelease)


***** Build with 3.4 current *****

lobell@VOLVO ~/gcc_test
$ ll
total 873
drwxrwxrwx+   2 lobell   None            0 Dec 21 18:40 .
drwxrwxrwx+   8 lobell   None            0 Dec 21 17:54 ..
-rw-rw-rw-    1 lobell   None       893508 Dec 16 15:32 expr.i

lobell@VOLVO ~/gcc_test
$ ~/build/gcc_current1/gcc/xgcc.exe -B ~/build/gcc_current1/gcc -c -O2 -mmmx 
expr.i

lobell@VOLVO ~/gcc_test
$ ll
total 1099
drwxrwxrwx+   2 lobell   None            0 Dec 21 18:41 .
drwxrwxrwx+   8 lobell   None            0 Dec 21 17:54 ..
-rw-rw-rw-    1 lobell   None       893508 Dec 16 15:32 expr.i
-rw-rw-rw-    1 lobell   None       231308 Dec 21 18:41 expr.o

lobell@VOLVO ~/gcc_test
$ ~/build/gcc_current1/gcc/xgcc.exe -B ~/build/gcc_current1/gcc -v
Reading specs from /home/lobell/build/gcc_current1/gcc/specs
Configured with:
Thread model: single
gcc version 3.4 20021221 (experimental)


Conclusion:
The bug exists only in 3.3 branch.

Does that help?

Regards.



> From: Wolfgang Bangerth <bangerth@ticam.utexas.edu>
> To: Mack Lobell <macklobell@hotmail.com>
> CC: gcc-bugs@gcc.gnu.org, <gcc-gnats@gcc.gnu.org>
> Subject: Re: c/8962: "-O2 -mmmx" makes gcc seg fault
> Date: Sat, 21 Dec 2002 10:55:13 -0600 (CST)
>
>
> > did the following:
>
> Thanks for your experiments. I think there is no need for you to try an
> even newer snapshot. The only thing you could do is try to strip down the
> testcase as much as possible, presently it is rather long. We usually do
> that by first stripping off the line number lines using
>   perl -pi -e 's/^#.*\n//g;' expr.i
> so that the compiler gives the _actual_ line number in this file when it
> crashes. Then try to delete as much stuff from the file as you can.
> Usually, one can get it down to 20-30 lines and still see the crash. But
> be warned that this can be a tediuous process that could take 30 minutes
> to an hour, if you're not frequently doing such things.
>
> Thanks for your help
>   Wolfgang
>
> -------------------------------------------------------------------------
> Wolfgang Bangerth              email:           bangerth@ticam.utexas.edu
>                                www: http://www.ticam.utexas.edu/~bangerth

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