[Bug bootstrap/55211] New: [4.8 regression] sparc64-linux bootstrap fails with SIGILL while compiling __mulvti3

["mikpe at it dot uu.se" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55211

             Bug #: 55211
           Summary: [4.8 regression] sparc64-linux bootstrap fails with
                    SIGILL while compiling __mulvti3
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mikpe@it.uu.se


Attempting to bootstrap 4.8-20121104 on sparc64-linux fails with:

/mnt/scratch/objdir48/./gcc/xgcc -B/mnt/scratch/objdir48/./gcc/
-B/mnt/scratch/install48/sparc64-unknown-linux-gnu/bin/
-B/mnt/scratch/install48/sparc64-unknown-linux-gnu/lib/ -isystem
/mnt/scratch/install48/sparc64-unknown-linux-gnu/include -isystem
/mnt/scratch/install48/sparc64-unknown-linux-gnu/sys-include    -g -O2 -m64 -O2
 -g -O2 -DIN_GCC   -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include   -fPIC -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector  
-fPIC -I. -I. -I../../.././gcc -I/mnt/scratch/gcc-4.8-20121104/libgcc
-I/mnt/scratch/gcc-4.8-20121104/libgcc/.
-I/mnt/scratch/gcc-4.8-20121104/libgcc/../gcc
-I/mnt/scratch/gcc-4.8-20121104/libgcc/../include  -DHAVE_CC_TLS  -o _mulvdi3.o
-MT _mulvdi3.o -MD -MP -MF _mulvdi3.dep -DL_mulvdi3 -c
/mnt/scratch/gcc-4.8-20121104/libgcc/libgcc2.c -fvisibility=hidden
-DHIDE_EXPORTS
/mnt/scratch/gcc-4.8-20121104/libgcc/libgcc2.c: In function '__mulvti3':
/mnt/scratch/gcc-4.8-20121104/libgcc/libgcc2.c:397:1: internal compiler error:
Illegal instruction
 }
 ^

/mnt/scratch/gcc-4.8-20121104/libgcc/libgcc2.c:397:1: internal compiler error:
Aborted
xgcc: internal compiler error: Aborted (program cc1)
make[5]: *** [_mulvdi3.o] Aborted
make[5]: Leaving directory
`/mnt/scratch/objdir48/sparc64-unknown-linux-gnu/64/libgcc'
make[4]: *** [multi-do] Error 1
make[4]: Leaving directory
`/mnt/scratch/objdir48/sparc64-unknown-linux-gnu/libgcc'
make[3]: *** [all-multi] Error 2
make[3]: Leaving directory
`/mnt/scratch/objdir48/sparc64-unknown-linux-gnu/libgcc'
make[2]: *** [all-stage2-target-libgcc] Error 2
make[2]: Leaving directory `/mnt/scratch/objdir48'
make[1]: *** [stage2-bubble] Error 2
make[1]: Leaving directory `/mnt/scratch/objdir48'
make: *** [bootstrap] Error 2

Re-running cc1 in gdb shows:

Program received signal SIGILL, Illegal instruction.
0x00575f94 in emit_note_insn_var_location(void**, void*) ()
Missing separate debuginfos, use: debuginfo-install glibc-2.13.90-4.1.sparcv9
(gdb) bt
#0  0x00575f94 in emit_note_insn_var_location(void**, void*) ()
#1  0x00734b7c in htab_traverse_noresize ()
#2  0x00576a64 in emit_notes_for_changes(rtx_def*, emit_note_where,
shared_hash_def*) ()
#3  0x00577118 in vt_emit_notes() ()
#4  0x0057a378 in variable_tracking_main() ()
#5  0x002f8454 in execute_one_pass(opt_pass*) ()
#6  0x002f8954 in execute_pass_list(opt_pass*) ()
#7  0x002f8978 in execute_pass_list(opt_pass*) ()
#8  0x002f8978 in execute_pass_list(opt_pass*) ()
#9  0x00111ad8 in expand_function(cgraph_node*) ()
#10 0x001134fc in compile() ()
#11 0x00113c8c in finalize_compilation_unit() ()
#12 0x00034a14 in c_write_global_declarations() ()
#13 0x003a62bc in compile_file() ()
#14 0x003a7c04 in toplev_main(int, char**) ()
#15 0xf7d44234 in __libc_start_main () from /lib/libc.so.6
#16 0x00023798 in _start ()

Disassembling the faulting instruction shows:

(gdb) disassemble 0x575f80,0x575fa0
Dump of assembler code from 0x575f80 to 0x575fa0:
   0x00575f80 <_ZL27emit_note_insn_var_locationPPvS_+1584>:     clr  %i3
   0x00575f84 <_ZL27emit_note_insn_var_locationPPvS_+1588>:     add  %fp, -192,
%i2
   0x00575f88 <_ZL27emit_note_insn_var_locationPPvS_+1592>:     add  %fp, -128,
%i0
   0x00575f8c <_ZL27emit_note_insn_var_locationPPvS_+1596>:     add  %i5, %i5,
%g1
   0x00575f90 <_ZL27emit_note_insn_var_locationPPvS_+1600>:     ld  [ %i2 + %i5
], %i1
=> 0x00575f94 <_ZL27emit_note_insn_var_locationPPvS_+1604>:     ldd  [ %i0 +
%g1 ], %o1
   0x00575f98 <_ZL27emit_note_insn_var_locationPPvS_+1608>:     call  0x1835a0
<_Z17gen_rtx_CONST_INT12machine_modex>
   0x00575f9c <_ZL27emit_note_insn_var_locationPPvS_+1612>:     clr  %o0
End of assembler dump.
(gdb) print/x $i0
$1 = 0xffffc5b8
(gdb) print/x $g1
$2 = 0x0

The same problem occurred with the previous weekly snapshot, 4.8-20121028,
while the one before that (4.8-20121021) was Ok.

Configuration parameters:
/mnt/scratch/gcc-4.8-20121104/configure --prefix=/mnt/scratch/install48
--with-gmp=/home/mikpe/pkgs/linux-sparc64/gmp-5.0.5
--with-mpfr=/home/mikpe/pkgs/linux-sparc64/mpfr-3.1.1
--with-mpc=/home/mikpe/pkgs/linux-sparc64/mpc-1.0.1 --with-cpu=v8
--enable-multilib --disable-plugin --disable-lto --disable-nls
--enable-threads=posix --enable-checking=release --disable-libmudflap
--enable-languages=c,c++,fortran,ada