[Bug target/50350] New: [4.6 Regression] ICE (segfault) in canonicalize_float_value

["doko at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50350

             Bug #: 50350
           Summary: [4.6 Regression] ICE (segfault) in
                    canonicalize_float_value
    Classification: Unclassified
           Product: gcc
           Version: 4.6.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: doko@gcc.gnu.org


Created attachment 25237
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25237
preprocessed source

seen with r178746 on the 4.6 branch, not seen with r178501.

/home/doko/gcc/gcc-4.6-4.6.1/build/./gcc/xgcc
-B/home/doko/gcc/gcc-4.6-4.6.1/build/./gcc/ -B/usr/ia64-linux-gnu/bin/
-B/usr/ia64-linux-gnu/lib/ -isystem /usr/ia64-linux-gnu/include -isystem
/usr/ia64-linux-gnu/sys-include    -g -O2 -O2  -g -O2 -DIN_GCC  
-DUSE_LIBUNWIND_EXCEPTIONS -W -Wall -Wwrite-strings -Wcast-qual
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include  -fPIC -DUSE_GAS_SYMVER -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2
-D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -I../.././gcc
-I../../../src/libgcc -I../../../src/libgcc/. -I../../../src/libgcc/../gcc
-I../../../src/libgcc/../include  -DHAVE_CC_TLS  -o __trampoline.o -MT
__trampoline.o -MD -MP -MF __trampoline.dep -DL__trampoline
-xassembler-with-cpp \
          -c ../../../src/libgcc/../gcc/config/ia64/lib1funcs.asm -include
__trampoline.vis
/home/doko/gcc/gcc-4.6-4.6.1/build/./gcc/xgcc
-B/home/doko/gcc/gcc-4.6-4.6.1/build/./gcc/ -B/usr/ia64-linux-gnu/bin/
-B/usr/ia64-linux-gnu/lib/ -isystem /usr/ia64-linux-gnu/include -isystem
/usr/ia64-linux-gnu/sys-include    -g -O2 -O2  -g -O2 -DIN_GCC  
-DUSE_LIBUNWIND_EXCEPTIONS -W -Wall -Wwrite-strings -Wcast-qual
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include  -fPIC -DUSE_GAS_SYMVER -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2
-D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -I../.././gcc
-I../../../src/libgcc -I../../../src/libgcc/. -I../../../src/libgcc/../gcc
-I../../../src/libgcc/../include  -DHAVE_CC_TLS  -o _lshrdi3.o -MT _lshrdi3.o
-MD -MP -MF _lshrdi3.dep -DL_lshrdi3 -c ../../../src/libgcc/../gcc/libgcc2.c \
          -fvisibility=hidden -DHIDE_EXPORTS
../../../src/libgcc/../gcc/libgcc2.c: In function '__lshrti3':
../../../src/libgcc/../gcc/libgcc2.c:404:1: internal compiler error:
Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.


make[5]: *** [_lshrdi3.o] Error 1
make[5]: Leaving directory
`/home/doko/gcc/gcc-4.6-4.6.1/build/ia64-linux-gnu/libgcc'
make[4]: *** [all-stage2-target-libgcc] Error 2
make[4]: Leaving directory `/home/doko/gcc/gcc-4.6-4.6.1/build'
make[3]: *** [stage2-bubble] Error 2
make[3]: Leaving directory `/home/doko/gcc/gcc-4.6-4.6.1/build'
make[2]: *** [bootstrap-lean] Error 2


Program received signal SIGSEGV, Segmentation fault.
0x40000000008567c1 in canonicalize_float_value ()
(gdb) bt
#0  0x40000000008567c1 in canonicalize_float_value ()
#1  0x4000000000856ff0 in set_lattice_value ()
#2  0x4000000000863040 in visit_assignment ()
#3  0x400000000091f9e0 in simulate_stmt ()
#4  0x4000000000921930 in ssa_propagate ()
#5  0x40000000008598b0 in do_ssa_ccp ()
#6  0x40000000005c6c20 in execute_one_pass ()
#7  0x40000000005c7490 in execute_pass_list ()
#8  0x40000000005c74e0 in execute_pass_list ()
#9  0x40000000007ef930 in tree_rest_of_compilation ()
#10 0x4000000000adc870 in cgraph_expand_function ()
#11 0x4000000000ae1300 in cgraph_optimize ()
#12 0x4000000000ae22a0 in cgraph_finalize_compilation_unit ()
#13 0x40000000000ca3f0 in c_write_global_declarations ()
#14 0x4000000000749ad0 in toplev_main ()
#15 0x400000000009bdf0 in main ()