[Bug target/34163] [4.3/4.4/4.5 Regression] 10% performance regression since Nov 1 on Polyhedron's "NF" on AMD64

[rguenth at gcc dot gnu dot org]

------- Comment #16 from rguenth at gcc dot gnu dot org  2009-06-25 09:01 -------
Executing predictive commoning without unrolling.

with -m32.  One of the cases SCEV is confused about pointer-plus offsets
being sizetype:

(Data Ref:
  stmt: (*x_58(D))[D.1627_54] = D.1638_71;
  ref: (*x_58(D))[D.1627_54];
  base_object: (*x_58(D))[0];
  Access function 0: {(integer(kind=8)) i_43 + -1, +, 1}_1
  Access function 1: 0B

vs.

(Data Ref:
  stmt: D.1634_67 = (*x_58(D))[D.1632_62];
  ref: (*x_58(D))[D.1632_62];
  base_object: (*x_58(D))[0];
  Access function 0: {(integer(kind=8)) (i_43 + -1) + -1, +, 1}_1
  Access function 1: 0B


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34163