[Bug tree-optimization/101009] [12 Regression] wrong code with "-O3 -fno-tree-sra"

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101009

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, so

(compute_affine_dependence
  stmt_a: g[1].c = 1;
  stmt_b: *f.0_1 = g[1];
) -> no dependence

isn't the problem but the problem is

(compute_affine_dependence
  stmt_a: g[1].c = 1;
  stmt_b: *f.0_1 = g[1];
(analyze_overlapping_iterations
  (chrec_a = 1)
  (chrec_b = 1)
(analyze_ziv_subscript
)
  (overlap_iterations_a = [0])
  (overlap_iterations_b = [0]))
(build_classic_dist_vector
  dist_vector = (  1
  )
)
)

The compute_affine_dependence dumping fails to mark the DR involved, for the
second query it's really g[1].c vs. g[1] but that should have a dist vector
of 0, not 1 I think.