[Bug middle-end/56548] New: [4.8 Regression] ICE in emit_move_insn, at expr.c:3486 with -march=pentium{pro,2,3} -O3

[d.g.gorbachev at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56548



             Bug #: 56548

           Summary: [4.8 Regression] ICE in emit_move_insn, at expr.c:3486

                    with -march=pentium{pro,2,3} -O3

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: middle-end

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: d.g.gorbac...@gmail.com





GCC 4.8.0 20130303 (experimental).



$ cat > bug.c

short foo(short x)

{

  int i;



  for (i = 0; i < 3; i++)

    if (x > 0)

      x--;



  return x;

}

^D

$ gcc -S -O3 -march=pentium3 bug.c

bug.c: In function 'foo':

bug.c:9:3: internal compiler error: in emit_move_insn, at expr.c:3486

   return x;

   ^

0x834eaa1 emit_move_insn(rtx_def*, rtx_def*)

    ../../gcc-4.8/gcc/expr.c:3485

0x8600ef9 expand_value_return

    ../../gcc-4.8/gcc/stmt.c:1461

0x86068d8 expand_return(tree_node*)

    ../../gcc-4.8/gcc/stmt.c:1547

0x825eefc expand_gimple_stmt_1

    ../../gcc-4.8/gcc/cfgexpand.c:2182

0x825f82c expand_gimple_stmt

    ../../gcc-4.8/gcc/cfgexpand.c:2304

0x8262484 expand_gimple_basic_block

    ../../gcc-4.8/gcc/cfgexpand.c:4083

0x82648c8 gimple_expand_cfg

    ../../gcc-4.8/gcc/cfgexpand.c:4602



GCC 20121118 (r193607) - fails, 20121111 (r193417) - works.