[Bug middle-end/29256] [4.3/4.4/4.5/4.6 regression] loop performance regression

[pthaugen at gcc dot gnu dot org]

------- Comment #33 from pthaugen at gcc dot gnu dot org  2010-07-16 19:14 
-------
gcc.dg/tree-ssa/loop-19.c started failing on powerpc with -m64 between 7/5 and
7/7. The tree dump now looks like the following:

<bb 2>:
  ivtmp.10_12 = (long unsigned int) &a[-1];
  ivtmp.16_15 = (long unsigned int) &c[-1];
  a.21_18 = (long unsigned int) &a;
  D.2035_19 = a.21_18 + 15999992;

<bb 3>:
  # ivtmp.10_9 = PHI <ivtmp.10_5(3), ivtmp.10_12(2)>
  # ivtmp.16_13 = PHI <ivtmp.16_14(3), ivtmp.16_15(2)>
  ivtmp.10_5 = ivtmp.10_9 + 8;
  D.2032_16 = (void *) ivtmp.10_5;
  D.2007_3 = MEM[(double[2000000] *)D.2032_16];
  ivtmp.16_14 = ivtmp.16_13 + 8;
  D.2033_17 = (void *) ivtmp.16_14;
  MEM[(double[2000000] *)D.2033_17] = D.2007_3;
  if (ivtmp.10_5 != D.2035_19)
    goto <bb 3>;
  else
    goto <bb 4>;


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29256