[Bug tree-optimization/56494] New: ICE in simplify_truncation, at simplify-rtx.c:619

[antoine.balestrat at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56494

             Bug #: 56494
           Summary: ICE in simplify_truncation, at simplify-rtx.c:619
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: antoine.balest...@gmail.com


With GCC 4.8.0 as of 20130301 :

$ cat trunc.c
char a;
short b;

void f(void)
{
    g((!!b ? : (a *= a / 0)) >= (a = b));
}

$ xgcc -w -O2 -ftracer trunc.c
trunc.c: In function ‘f’:
trunc.c:7:1: internal compiler error: in simplify_truncation, at
simplify-rtx.c:619
 }
 ^
0x8db526 simplify_truncation
    ../../srcdir/gcc/simplify-rtx.c:619
0x8dc6fa simplify_unary_operation_1
    ../../srcdir/gcc/simplify-rtx.c:1046
0x8dc6fa simplify_unary_operation(rtx_code, machine_mode, rtx_def*,
machine_mode)
    ../../srcdir/gcc/simplify-rtx.c:786
0x8de2ef simplify_gen_unary(rtx_code, machine_mode, rtx_def*, machine_mode)
    ../../srcdir/gcc/simplify-rtx.c:369
0x8dc6fa simplify_unary_operation_1
    ../../srcdir/gcc/simplify-rtx.c:1046
0x8dc6fa simplify_unary_operation(rtx_code, machine_mode, rtx_def*,
machine_mode)
    ../../srcdir/gcc/simplify-rtx.c:786
0x8de2ef simplify_gen_unary(rtx_code, machine_mode, rtx_def*, machine_mode)
    ../../srcdir/gcc/simplify-rtx.c:369
0x8db057 simplify_truncation
    ../../srcdir/gcc/simplify-rtx.c:648
0x8dbc2d simplify_gen_subreg(machine_mode, rtx_def*, machine_mode, unsigned
int)
    ../../srcdir/gcc/simplify-rtx.c:5942
0xce9dce gen_lowpart_for_combine
    ../../srcdir/gcc/combine.c:10732
0xcef08e expand_compound_operation
    ../../srcdir/gcc/combine.c:6808
0xcf481f simplify_comparison
    ../../srcdir/gcc/combine.c:11168
0xcf754e combine_simplify_rtx
    ../../srcdir/gcc/combine.c:5665
0xcf972a subst
    ../../srcdir/gcc/combine.c:5155
0xcf93da subst
    ../../srcdir/gcc/combine.c:5100
0xcfa92f try_combine
    ../../srcdir/gcc/combine.c:3146
0xcff76c combine_instructions
    ../../srcdir/gcc/combine.c:1368
0xcff76c rest_of_handle_combine
    ../../srcdir/gcc/combine.c:13793
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