endless loop in compute_inverse bootstrapping on alpha

[Ritzert at t-online dot de]

Hi all,

it seems this patch:
http://gcc.gnu.org/ml/gcc-patches/2002-08/msg01364.html

causes gcc to remain in compute_inverse:
alpha1:/proc/12118/cwd# gdb ./cc1 12118
GNU gdb 2002-04-01-cvs
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
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This GDB was configured as "alpha-linux"...
Attaching to program: /home/obj/alpha/gcc-HEAD/gcc/cc1, process 12118
Reading symbols from /lib/libc.so.6.1...done.
Loaded symbols for /lib/libc.so.6.1
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
0x12045a4d4 in compute_inverse (order=32)
    at /home/ritzert/nfs/compile/gcc/HEAD/gcc/gcc/ggc-page.c:1085
1085      while (size % 2 == 0)
Breakpoint 1 at 0x120143858: file
/home/ritzert/nfs/compile/gcc/HEAD/gcc/gcc/diagnostic.c, line 1352.
Breakpoint 2 at 0x20000081dac
Breakpoint 3 at 0x2000007ff50
(gdb) bt
#0  0x12045a4d4 in compute_inverse (order=32)
    at /home/ritzert/nfs/compile/gcc/HEAD/gcc/gcc/ggc-page.c:1085
#1  0x12045a888 in init_ggc ()
    at /home/ritzert/nfs/compile/gcc/HEAD/gcc/gcc/ggc-page.c:1168
#2  0x120402b14 in general_init (argv0=0x11fffeba8 "./cc1")
    at /home/ritzert/nfs/compile/gcc/HEAD/gcc/gcc/toplev.c:4729
#3  0x120404010 in toplev_main (argc=24, argv=0x11fffe6d8)
    at /home/ritzert/nfs/compile/gcc/HEAD/gcc/gcc/toplev.c:5357
#4  0x1200d9818 in main (argc=24, argv=0x11fffe6d8)
    at /home/ritzert/nfs/compile/gcc/HEAD/gcc/gcc/main.c:35

It used 1013:45 minutes of CPU time so far with the following command
line:

./cc1 -quiet -iprefix ./../lib/gcc-lib/alpha-unknown-linux-gnu/3.3/
-isystem
./include-isystem/home/obj/alpha/install/alpha-unknown-linux-gnu/bin/include
-D__GNUC__=3 -D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=0 -D__ELF__
-isystem /home/obj/alpha/install/alpha-unknown-linux-gnu/include
-isystem /home/obj/alpha/install/alpha-unknown-linux-gnu/sys -include
tmp-dum.c -quiet -dumpbase tmp-dum.c -auxbase tmp-dum-o tmp-dum.s

called from

./xgcc -B./ -B/home/obj/alpha/install/alpha-unknown-linux-gnu/bin/
-isystem /home/obj/alpha/install/alpha-unknown-linux-gnu/include
-isystem /home/obj/alpha/install/alpha-unknown-linux-gnu/sys-include -S
tmp-dum.c

This is on alpha-unknown-linux-gnu. The bootstrap on
hppa1.1-hp-hpux11.00 on the same sources is beyond that point.

Michael