[Bug bootstrap/42511] bootstrap error in stage3 on alpha-linux-gnu

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #8 from ubizjak at gmail dot com  2010-01-05 14:21 -------
It looks that tree loop IM FUBARs the compilation.

All testcases compile OK with -O2 -fno-tree-loop-im.

The dump for _.c.099t.lim1 looks quite strange (it resembles _.c.024t.ssa):

--cut here--
;; Function alpha_fallback_frame_state (alpha_fallback_frame_state)



Symbols to be put in SSA form

{ .MEM fs___regfs__I_I__howfs___regfs__I_I_I.3 }


Incremental SSA update started at block: 0

Number of blocks in CFG: 6
Number of blocks to update: 5 ( 83%)




SSA replacement table
N_i -> { O_1 ... O_j } means that N_i replaces O_1, ..., O_j

fs___regfs__I_I__howfs___regfs__I_I_I.3_10 -> {
fs___regfs__I_I__howfs___regfs__I_I_I.3_9 }

Number of virtual NEW -> OLD mappings:       0
Number of real NEW -> OLD mappings:          1
Number of total NEW -> OLD mappings:         1

Number of virtual symbols: 0


Incremental SSA update started at block: 3

Number of blocks in CFG: 6
Number of blocks to update: 2 ( 33%)



alpha_fallback_frame_state (struct _Unwind_FrameState * fs)
{
  int fs___regfs__I_I__howfs___regfs__I_I_I.3;
  long int pretmp.2;
  long int i;
  long int D.2028;

<bb 2>:
  D.2028_3 = i_11 + 32;
  fs___regfs__I_I__howfs___regfs__I_I_I.3_8 = fs_4(D)->reg[D.2028_3].how;

<bb 3>:
  # i_11 = PHI <i_5(4), 0(2)>
  fs___regfs__I_I__howfs___regfs__I_I_I.3_9 = 0;
  i_5 = i_11 + 1;
  if (i_5 <= 30)
    goto <bb 4>;
  else
    goto <bb 5>;

<bb 4>:
  goto <bb 3>;

<bb 5>:
  # fs___regfs__I_I__howfs___regfs__I_I_I.3_10 = PHI
<fs___regfs__I_I__howfs___regfs__I_I_I.3_9(3)>
  fs_4(D)->reg[D.2028_3].how = fs___regfs__I_I__howfs___regfs__I_I_I.3_10;
  return;

}
--cut here--


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42511