[Bug tree-optimization/24653] [4.1 regression] EON regressed seriously on x86-64

[hubicka at gcc dot gnu dot org]

------- Comment #2 from hubicka at gcc dot gnu dot org  2005-11-03 12:58 -------
OK, have new, 100% sure theory ;)
for 4.0 -fno-tree-sra makes important difference, for 4.1 it does not.  One
difference is that 4.0 splits startingpoint:
Initial instantiation for startPoint
  startPoint.e[2] -> startPoint$e$2
  startPoint.e[1] -> startPoint$e$1
  startPoint.e[0] -> startPoint$e$0
4.1 claims:
Cannot scalarize variable startPoint because it must live in memory

so this looks like 4.1 is missing transformation here.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24653