[Bug tree-optimization/23855] Should not do loop header copying for inner loop

[rguenth at gcc dot gnu dot org]

------- Additional Comments From rguenth at gcc dot gnu dot org  2005-09-13 13:12 -------
Unswitching should clean this up, but unfortunately(?) only looks at innermost
loops.  For a reason it seems, just removing this checks results in an ICE.
Testcase for unswitching:

void bar(void);
void foo(int ie, int je)
{
  int j;
  int i;

  if (je <= 0)
    goto L5;

  j = 0;
L2:
  if (ie <= 0)
    goto L3;

  i = 0;
L1:
  bar ();
  i = i + 1;
  if (ie != i) goto L1;

L3:
  j = j + 1;
  if (je != j) goto L2;

L5:
  return;
}


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rakdver at atrey dot karlin
                   |                            |dot mff dot cuni dot cz


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23855