[Bug tree-optimization/50213] [4.6/4.7 Regression] Regression in space-optimized code relative to 4.5.x

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50213

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-09-07 
09:08:16 UTC ---
It will of course no longer combine offsets that way, like for

  p_2 = p_1 + 4;

  loop
    p_4 = MEM[p_2 - 4];

so it's clearly not a win-win situation to base the decision on loop
depth.