[Bug middle-end/50667] New: [4.7 Regression] FAIL: gcc.c-torture/execute/vshuf-* on powerpc-apple-darwin9

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50667

             Bug #: 50667
           Summary: [4.7 Regression] FAIL: gcc.c-torture/execute/vshuf-*
                    on powerpc-apple-darwin9
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr
                CC: rth@gcc.gnu.org
              Host: powerpc-apple-darwin9
            Target: powerpc-apple-darwin9
             Build: powerpc-apple-darwin9


Between revisions 179667 (OK) and 179708 (ICE, see
http://gcc.gnu.org/ml/gcc-testresults/2011-10/msg00887.html) the tests
gcc.c-torture/execute/vshuf-* are failing with an internal compiler error:

[karma] f90/bug% gcc47
/opt/gcc/work/gcc/testsuite/gcc.c-torture/execute/vshuf-v16qi.c
[address=18e6a568 pc=005a76dc]
In file included from
/opt/gcc/work/gcc/testsuite/gcc.c-torture/execute/vshuf-v16qi.c:5:0:
/opt/gcc/work/gcc/testsuite/gcc.c-torture/execute/vshuf-main.inc: In function
'main':
/opt/gcc/work/gcc/testsuite/gcc.c-torture/execute/vshuf-main.inc:12:9: internal
compiler error: Segmentation Fault

The back-trace is

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x18e6a568
maybe_gen_insn (icode=16845201, nops=4, ops=0xbfffd1e8) at
../../work/gcc/optabs.c:7436
7436      gcc_assert (nops == (unsigned int) insn_data[(int)
icode].n_generator_args);
(gdb) bt
#0  maybe_gen_insn (icode=16845201, nops=4, ops=0xbfffd1e8) at
../../work/gcc/optabs.c:7436
#1  0x005a7e60 in maybe_expand_insn (icode=<value temporarily unavailable, due
to optimizations>, nops=<value temporarily unavailable, due to optimizations>,
ops=<value temporarily unavailable, due to optimizations>) at
../../work/gcc/optabs.c:7468
#2  0x005b0198 in expand_insn (icode=<value temporarily unavailable, due to
optimizations>, nops=<value temporarily unavailable, due to optimizations>,
ops=<value temporarily unavailable, due to optimizations>) at
../../work/gcc/optabs.c:7499
#3  0x005b0b54 in expand_vec_perm_expr (type=<value temporarily unavailable,
due to optimizations>, v0=0x41d7f65c, v1=0x20213220, mask=<value temporarily
unavailable, due to optimizations>, target=<value temporarily unavailable, due
to optimizations>) at ../../work/gcc/optabs.c:6704
#4  0x003995a0 in expand_expr_real_2 (ops=0xbfffd358, target=0x1010991,
tmode=V16QImode, modifier=EXPAND_NORMAL) at ../../work/gcc/expr.c:8610
#5  0x00273388 in expand_gimple_stmt (stmt=0x41dbd0a8) at
../../work/gcc/cfgexpand.c:2014
#6  0x00273ff4 in expand_gimple_basic_block (bb=0x41dbd0a8) at
../../work/gcc/cfgexpand.c:3814
#7  0x002764d8 in gimple_expand_cfg () at ../../work/gcc/cfgexpand.c:4322
#8  0x005bd020 in execute_one_pass (pass=0xbd8eb0) at
../../work/gcc/passes.c:2064
#9  0x005bd3d4 in execute_pass_list (pass=0xccd2c8) at
../../work/gcc/passes.c:2119
#10 0x00713dcc in tree_rest_of_compilation (fndecl=0x41da7500) at
../../work/gcc/tree-optimize.c:420
#11 0x0029ba84 in cgraph_expand_function (node=0x41dbf968) at
../../work/gcc/cgraphunit.c:1805
#12 0x0029deec in cgraph_optimize () at ../../work/gcc/cgraphunit.c:1962
#13 0x0029e214 in cgraph_finalize_compilation_unit () at
../../work/gcc/cgraphunit.c:1312
#14 0x000206f8 in c_write_global_declarations () at
../../work/gcc/c-decl.c:9936
#15 0x00688214 in toplev_main (argc=2, argv=0xe) at ../../work/gcc/toplev.c:581
#16 0x00001bf8 in start ()