Re: verify_flow_info check fails building libgcc2 on ia64

[Jan Hubicka <jh at suse dot cz>]

> The mainline bootstrap of ia64-unknown-linux-gnu has been failing for
> awhile now for various reasons, but currently it fails with a check in
> verify_flow_info building libgcc2:
Yes, this has been discussed earlier.  It is caused by cfg rebuild late in the
compilation process (in MDEP_REORDER) that does not reload probabilility notes.
One posibility is just avoid verify_flow_info in find_basic_blocks, but I
believe we just need to remove that find_basic_block call as flow info should
be consistent at that point, but I will check
afternoon.  Hope I will find ia-64 machine at suse to bootstrap.

Honza
> 
> ./xgcc -B./ -B/home/build/gcc_mainline/ia64/install/ia64-unknown-linux/bin/ -isystem /home/build/gcc_mainline/ia64/install/ia64-unknown-linux/include -isystem /home/build/gcc_mainline/ia64/install/ia64-unknown-linux/sys-include -O2  -DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -isystem ./include  -fPIC -g1  -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED  -I. -I. -I../../../gcc/gcc -I../../../gcc/gcc/. -I../../../gcc/gcc/config -I../../../gcc/gcc/../include  -DL_lshrdi3 -c ../../../gcc/gcc/libgcc2.c -o libgcc/./_lshrdi3.o
> ../../../gcc/gcc/libgcc2.c: In function `__lshrti3':
> ../../../gcc/gcc/libgcc2.c:266: verify_flow_info: REG_BR_PROB does not match cfg 5000 0
> ../../../gcc/gcc/libgcc2.c:266: verify_flow_info failed
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions
> 
> I've seen messages about problems with verify_flow_info building libjava
> but haven't seen anything about this failure.  Honza, let me know if
> you'd like more information about this.
> 
> Janis