[Bug middle-end/47968] ICE: in gen_lowpart_general, at rtlhooks.c:51 when converting vector of double to vector of float

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47968

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.03.03 13:15:19
          Component|rtl-optimization            |middle-end
     Ever Confirmed|0                           |1

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-03 
13:15:19 UTC ---
Confirmed.

#1  0x000000000098a3b8 in gen_lowpart_general (mode=SFmode, x=0x7ffff5b36900)
    at /space/rguenther/src/svn/trunk/gcc/rtlhooks.c:51
51          gcc_assert (result != 0);
(gdb) p x
$1 = (rtx) 0x7ffff5b36900
(gdb) call debug_rtx (x)
(reg:DF 64)

Happens during expanding of BIT_FIELD_REF <f4.0_2, 32, 0> from

;; Function foo (foo)

foo (double2 d2)
{
  float D.2687;
  vector(4) float f4.0;

  # BLOCK 2 freq:10000
  # PRED: ENTRY [100.0%]  (fallthru,exec)
  f4.0_2 = VIEW_CONVERT_EXPR<vector(4) float>(d2_1(D));
  D.2687_3 = BIT_FIELD_REF <f4.0_2, 32, 0>;
  return D.2687_3;