Re: PATCH COMMITTED: First lower-subreg patch

["Richard Guenther" <richard dot guenther at gmail dot com>]

On 2/1/07, Grigory Zagorodnev <grigory_zagorodnev@linux.intel.com> wrote:
> Ian Lance Taylor wrote:
> > I am about to commit the first lower-subreg patch.  Where possible,
> > gcc/ChangeLog:
> > 2007-01-31  Richard Henderson  <rth@redhat.com>
> >           Ian Lance Taylor  <iant@google.com>
>
> Hi, Ian!
> Unfortunately your patch leads to bootstrap failure at
> x86_64-redhat-linux. Error log is listed below.
>
> - Grigory
>
> /gcc_43/bld/./gcc/xgcc -B/gcc_43/bld/./gcc/
> -B/gcc_43/usr/x86_64-redhat-linux/bin/
> -B/gcc_43/usr/x86_64-redhat-linux/lib/ -isystem
> /gcc_43/usr/x86_64-redhat-linux/include -isystem
> /gcc_43/usr/x86_64-redhat-linux/sys-include -g -fkeep-inline-functions
> -O2  -O2 -g -O2  -DIN_GCC    -W -Wall -Wwrite-strings
> -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
> -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2
> -D__GCC_FLOAT_NOT_NEEDED   -I. -I. -I../.././gcc -I/gcc_43/src/libgcc
> -I/gcc_43/src/libgcc/. -I/gcc_43/src/libgcc/../gcc
> -I/gcc_43/src/libgcc/../include -I/gcc_43/src/libgcc/../libdecnumber
> -I../../libdecnumber -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep
> -DL_muldi3 -c /gcc_43/src/libgcc/../gcc/libgcc2.c \
>            -fvisibility=hidden -DHIDE_EXPORTS
> /gcc_43/src/libgcc/../gcc/libgcc2.c: In function '__multi3':
> /gcc_43/src/libgcc/../gcc/libgcc2.c:566: internal compiler error:
> Segmentation fault
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <URL:http://gcc.gnu.org/bugs.html> for instructions.

We're ICEing from resolve_simple_move () with

(gdb) call debug_rtx (set)
(set (concatn:TI [
           (reg:DI 91 [ u ])
           (reg:DI 92 [ u+8 ])
       ])
   (subreg:TI (reg:DI 72 [ u ]) 0))

where simplify_gen_subreg_concatn returns 0 for the highpart.

Richard.